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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Perry%2C+R+S&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Perry%2C+R+S&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Perry%2C+R+S&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.19406">arXiv:2403.19406</a> <span> [<a href="https://arxiv.org/pdf/2403.19406">pdf</a>, <a href="https://arxiv.org/format/2403.19406">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-024-53900-3">10.1038/s41467-024-53900-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Kitaev Interactions Through an Extended Superexchange Pathway in the jeff = 1/2 Ru3+ Honeycomb Magnet, RuP3SiO11 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Abdeldaim%2C+A+H">Aly H. Abdeldaim</a>, <a href="/search/cond-mat?searchtype=author&query=Gretarsson%2C+H">Hlynur Gretarsson</a>, <a href="/search/cond-mat?searchtype=author&query=Day%2C+S+J">Sarah J. Day</a>, <a href="/search/cond-mat?searchtype=author&query=Le%2C+M+D">M. Duc Le</a>, <a href="/search/cond-mat?searchtype=author&query=Stenning%2C+G+B+G">Gavin B. G. Stenning</a>, <a href="/search/cond-mat?searchtype=author&query=Manuel%2C+P">Pascal Manuel</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">Robin S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Tsirlin%2C+A+A">Alexander A. Tsirlin</a>, <a href="/search/cond-mat?searchtype=author&query=Nilsen%2C+G+J">G酶ran J. Nilsen</a>, <a href="/search/cond-mat?searchtype=author&query=Clark%2C+L">Lucy Clark</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.19406v2-abstract-short" style="display: inline;"> Magnetic materials are composed of the simple building blocks of magnetic moments on a crystal lattice that interact via magnetic exchange. Yet from this simplicity emerges a remarkable diversity of magnetic states. Some reveal the deep quantum mechanical origins of magnetism, for example, quantum spin liquid (QSL) states in which magnetic moments remain disordered at low temperatures despite bein… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.19406v2-abstract-full').style.display = 'inline'; document.getElementById('2403.19406v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.19406v2-abstract-full" style="display: none;"> Magnetic materials are composed of the simple building blocks of magnetic moments on a crystal lattice that interact via magnetic exchange. Yet from this simplicity emerges a remarkable diversity of magnetic states. Some reveal the deep quantum mechanical origins of magnetism, for example, quantum spin liquid (QSL) states in which magnetic moments remain disordered at low temperatures despite being strongly correlated through quantum entanglement. A promising theoretical model of a QSL is the Kitaev model, composed of unusual bond-dependent exchange interactions, but experimentally, this model is challenging to realise. Here we show that the material requirements for the Kitaev QSL survive an extended pseudo-edge-sharing superexchange pathway of Ru3+ octahedra within the honeycomb layers of the inorganic framework solid, RuP3SiO11. We confirm the requisite jeff = 1/2 state of Ru3+ in RuP3SiO11 and resolve the hierarchy of exchange interactions that provide experimental access to an unexplored region of the Kitaev model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.19406v2-abstract-full').style.display = 'none'; document.getElementById('2403.19406v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">28 Pages, 5 figures, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.00515">arXiv:2312.00515</a> <span> [<a href="https://arxiv.org/pdf/2312.00515">pdf</a>, <a href="https://arxiv.org/format/2312.00515">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Carrier density crossover and quasiparticle mass enhancement in a doped 5$d$ Mott insulator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hsu%2C+Y">Yu-Te Hsu</a>, <a href="/search/cond-mat?searchtype=author&query=Rydh%2C+A">Andreas Rydh</a>, <a href="/search/cond-mat?searchtype=author&query=Berben%2C+M">Maarten Berben</a>, <a href="/search/cond-mat?searchtype=author&query=Duffy%2C+C">Caitlin Duffy</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Torre%2C+A">Alberto de la Torre</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">Robin S Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Hussey%2C+N+E">Nigel E Hussey</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.00515v1-abstract-short" style="display: inline;"> High-temperature superconductivity in cuprates emerges upon doping the parent Mott insulator. Robust signatures of the low-doped electronic state include a Hall carrier density that initially tracks the number of doped holes and the emergence of an anisotropic pseudogap; the latter characterised by disconnected Fermi arcs, closure at a critical doping level $p^* \approx 0.19$, and, in some cases,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.00515v1-abstract-full').style.display = 'inline'; document.getElementById('2312.00515v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.00515v1-abstract-full" style="display: none;"> High-temperature superconductivity in cuprates emerges upon doping the parent Mott insulator. Robust signatures of the low-doped electronic state include a Hall carrier density that initially tracks the number of doped holes and the emergence of an anisotropic pseudogap; the latter characterised by disconnected Fermi arcs, closure at a critical doping level $p^* \approx 0.19$, and, in some cases, a strongly enhanced carrier effective mass. In Sr$_2$IrO$_4$, a spin-orbit-coupled Mott insulator often regarded as a 5$d$ analogue of the cuprates, surface probes have revealed the emergence of an anisotropic pseudogap and Fermi arcs under electron doping, though neither the corresponding $p^*$ nor bulk signatures of pseudogap closing have as yet been observed. Here, we report electrical transport and specific heat measurements on Sr$_{2-x}$La$_x$IrO$_4$ over an extended doping range 0 $\leq x \leq$ 0.20. The effective carrier density $n_{\rm H}$ at low temperatures exhibits a crossover from $n_{\rm H} \approx x$ to $n_{\rm H} \approx 1+x$ near $x$ = 0.16, accompanied by \textcolor{blue}{a five-orders-of-magnitude increase in conductivity} and a six-fold enhancement in the electronic specific heat. These striking parallels in the bulk pseudogap phenomenology, coupled with the absence of superconductivity in electron-doped Sr$_2$IrO$_4$, disfavour the pseudogap as a state of precursor pairing and thereby narrow the search for the key ingredient underpinning the formation of the superconducting condensate in doped Mott insulators. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.00515v1-abstract-full').style.display = 'none'; document.getElementById('2312.00515v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.11796">arXiv:2310.11796</a> <span> [<a href="https://arxiv.org/pdf/2310.11796">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1073/pnas.2318159121">10.1073/pnas.2318159121 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Lorenz ratio as a guide to scattering contributions to Planckian transport </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Sun%2C+F">F. Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Mishra%2C+S">S. Mishra</a>, <a href="/search/cond-mat?searchtype=author&query=Stockert%2C+U">U. Stockert</a>, <a href="/search/cond-mat?searchtype=author&query=Daou%2C+R">R. Daou</a>, <a href="/search/cond-mat?searchtype=author&query=Kikugawa%2C+N">N. Kikugawa</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Hassinger%2C+E">E. Hassinger</a>, <a href="/search/cond-mat?searchtype=author&query=Hartnoll%2C+S+A">S. A. Hartnoll</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a>, <a href="/search/cond-mat?searchtype=author&query=Sunko%2C+V">V. Sunko</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.11796v1-abstract-short" style="display: inline;"> In many physical situations in which many-body assemblies exist at temperature $T$, a characteristic quantum-mechanical time scale of approximately $\hbar/k_{B}T$ can be identified in both theory and experiment, leading to speculation that it may be the shortest meaningful time in such circumstances. When this behaviour is investigated by probing the scattering rate of strongly interacting electro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.11796v1-abstract-full').style.display = 'inline'; document.getElementById('2310.11796v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.11796v1-abstract-full" style="display: none;"> In many physical situations in which many-body assemblies exist at temperature $T$, a characteristic quantum-mechanical time scale of approximately $\hbar/k_{B}T$ can be identified in both theory and experiment, leading to speculation that it may be the shortest meaningful time in such circumstances. When this behaviour is investigated by probing the scattering rate of strongly interacting electrons in metals, it is clear that in some cases only electron-electron scattering can be its cause, while in others it arises from high-temperature scattering of electrons from quantised lattice vibrations, i.e. phonons. In metallic oxides, which are among the most studied materials, analysis of electrical transport does not satisfactorily identify the relevant scattering mechanism at 'high' temperatures near room temperature. We employ a contactless optical method to measure thermal diffusivity in two Ru-based layered perovskites, Sr$_3$Ru$_2$O$_7$ and Sr$_2$RuO$_4$, and use the measurements to extract the dimensionless Lorenz ratio. By comparing our results to the literature data on both conventional and unconventional metals we show how the analysis of high-temperature thermal transport can both give important insight into dominant scattering mechanisms, and be offered as a stringent test of theories attempting to explain anomalous scattering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.11796v1-abstract-full').style.display = 'none'; document.getElementById('2310.11796v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">27 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.06853">arXiv:2309.06853</a> <span> [<a href="https://arxiv.org/pdf/2309.06853">pdf</a>, <a href="https://arxiv.org/format/2309.06853">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevResearch.5.043146">10.1103/PhysRevResearch.5.043146 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin-orbital correlations from complex orbital order in MgV$_{2}$O$_{4}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lane%2C+H">H. Lane</a>, <a href="/search/cond-mat?searchtype=author&query=Sarte%2C+P+M">P. M. Sarte</a>, <a href="/search/cond-mat?searchtype=author&query=Guratinder%2C+K">K. Guratinder</a>, <a href="/search/cond-mat?searchtype=author&query=Arevalo-Lopez%2C+A+M">A. M. Arevalo-Lopez</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+T">T. Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Roessli%2C+B">B. Roessli</a>, <a href="/search/cond-mat?searchtype=author&query=Stunault%2C+A">A. Stunault</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Y">Y. Su</a>, <a href="/search/cond-mat?searchtype=author&query=Ewings%2C+R+A">R. A. Ewings</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+S+D">S. D. Wilson</a>, <a href="/search/cond-mat?searchtype=author&query=B%C3%B6ni%2C+P">P. B枚ni</a>, <a href="/search/cond-mat?searchtype=author&query=Attfield%2C+J+P">J. P. Attfield</a>, <a href="/search/cond-mat?searchtype=author&query=Stock%2C+C">C. Stock</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.06853v1-abstract-short" style="display: inline;"> MgV$_{2}$O$_{4}$ is a spinel based on magnetic V$^{3+}$ ions which host both spin ($S=1$) and orbital ($l_{eff}=1$) moments. Owing to the underlying pyrochlore coordination of the magnetic sites, the spins in MgV$_{2}$O$_{4}$ only antiferromagnetically order once the frustrating interactions imposed by the $Fd\overline{3}m$ lattice are broken through an orbitally-driven structural distortion at T… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.06853v1-abstract-full').style.display = 'inline'; document.getElementById('2309.06853v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.06853v1-abstract-full" style="display: none;"> MgV$_{2}$O$_{4}$ is a spinel based on magnetic V$^{3+}$ ions which host both spin ($S=1$) and orbital ($l_{eff}=1$) moments. Owing to the underlying pyrochlore coordination of the magnetic sites, the spins in MgV$_{2}$O$_{4}$ only antiferromagnetically order once the frustrating interactions imposed by the $Fd\overline{3}m$ lattice are broken through an orbitally-driven structural distortion at T$_{S}$ $\simeq$ 60 K. Consequently, a N茅el transition occurs at T$_{N}$ $\simeq$ 40 K. Low temperature spatial ordering of the electronic orbitals is fundamental to both the structural and magnetic properties, however considerable discussion on whether it can be described by complex or real orbital ordering is ambiguous. We apply neutron spectroscopy to resolve the nature of the orbital ground state and characterize hysteretic spin-orbital correlations using x-ray and neutron diffraction. Neutron spectroscopy finds multiple excitation bands and we parameterize these in terms of a multi-level (or excitonic) theory based on the orbitally degenerate ground state. Meaningful for the orbital ground state, we report an "optical-like" mode at high energies that we attribute to a crystal-field-like excitation from the spin-orbital $j_{eff}$=2 ground state manifold to an excited $j_{eff}$=1 energy level. We parameterize the magnetic excitations in terms of a Hamiltonian with spin-orbit coupling and local crystalline electric field distortions resulting from deviations from perfect octahedra surrounding the V$^{3+}$ ions. We suggest that this provides compelling evidence for complex orbital order in MgV$_{2}$O$_{4}$. We then apply the consequences of this model to understand hysteretic effects in the magnetic diffuse scattering where we propose that MgV$_{2}$O$_{4}$ displays a high temperature orbital memory of the low temperature spin order. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.06853v1-abstract-full').style.display = 'none'; document.getElementById('2309.06853v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages and 13 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 5, 043146 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.12555">arXiv:2210.12555</a> <span> [<a href="https://arxiv.org/pdf/2210.12555">pdf</a>, <a href="https://arxiv.org/format/2210.12555">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-023-41714-8">10.1038/s41467-023-41714-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Strain control of a bandwidth-driven spin reorientation in Ca$_{3}$Ru$_{2}$O$_{7}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Dashwood%2C+C+D">C. D. Dashwood</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+A+H">A. H. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Kwasigroch%2C+M+P">M. P. Kwasigroch</a>, <a href="/search/cond-mat?searchtype=author&query=Veiga%2C+L+S+I">L. S. I. Veiga</a>, <a href="/search/cond-mat?searchtype=author&query=Faure%2C+Q">Q. Faure</a>, <a href="/search/cond-mat?searchtype=author&query=Vale%2C+J+G">J. G. Vale</a>, <a href="/search/cond-mat?searchtype=author&query=Porter%2C+D+G">D. G. Porter</a>, <a href="/search/cond-mat?searchtype=author&query=Manuel%2C+P">P. Manuel</a>, <a href="/search/cond-mat?searchtype=author&query=Khalyavin%2C+D+D">D. D. Khalyavin</a>, <a href="/search/cond-mat?searchtype=author&query=Orlandi%2C+F">F. Orlandi</a>, <a href="/search/cond-mat?searchtype=author&query=Colin%2C+C+V">C. V. Colin</a>, <a href="/search/cond-mat?searchtype=author&query=Fabelo%2C+O">O. Fabelo</a>, <a href="/search/cond-mat?searchtype=author&query=Kr%C3%BCger%2C+F">F. Kr眉ger</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+R+D">R. D. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=Green%2C+A+G">A. G. Green</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.12555v2-abstract-short" style="display: inline;"> The layered-ruthenate family of materials possess an intricate interplay of structural, electronic and magnetic degrees of freedom that yields a plethora of delicately balanced ground states. This is exemplified by Ca$_{3}$Ru$_{2}$O$_{7}$, which hosts a coupled transition in which the lattice parameters jump, the Fermi surface partially gaps and the spins undergo a $90^{\circ}$ in-plane reorientat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.12555v2-abstract-full').style.display = 'inline'; document.getElementById('2210.12555v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.12555v2-abstract-full" style="display: none;"> The layered-ruthenate family of materials possess an intricate interplay of structural, electronic and magnetic degrees of freedom that yields a plethora of delicately balanced ground states. This is exemplified by Ca$_{3}$Ru$_{2}$O$_{7}$, which hosts a coupled transition in which the lattice parameters jump, the Fermi surface partially gaps and the spins undergo a $90^{\circ}$ in-plane reorientation. Here, we show how the transition is driven by a lattice strain that tunes the electronic bandwidth. We apply uniaxial stress to single crystals of Ca$_{3}$Ru$_{2}$O$_{7}$, using neutron and resonant x-ray scattering to simultaneously probe the structural and magnetic responses. These measurements demonstrate that the transition can be driven by externally induced strain, stimulating the development of a theoretical model in which an internal strain is generated self-consistently to lower the electronic energy. We understand the strain to act by modifying tilts and rotations of the RuO$_{6}$ octahedra, which directly influences the nearest-neighbour hopping. Our results offer a blueprint for uncovering the driving force behind coupled phase transitions, as well as a route to controlling them. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.12555v2-abstract-full').style.display = 'none'; document.getElementById('2210.12555v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 6 figures (+ 12 pages, 6 figures of supplemental material)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat. Commun. 14, 6197 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.09368">arXiv:2208.09368</a> <span> [<a href="https://arxiv.org/pdf/2208.09368">pdf</a>, <a href="https://arxiv.org/format/2208.09368">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> The magnetic structure and field dependence of the cycloid phase mediating the spin reorientation transition in Ca$_3$Ru$_2$O$_7$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Faure%2C+Q">Q. Faure</a>, <a href="/search/cond-mat?searchtype=author&query=Dashwood%2C+C+D">C. D. Dashwood</a>, <a href="/search/cond-mat?searchtype=author&query=Colin%2C+C+V">C. V. Colin</a>, <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+R+D">R. D. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=Ressouche%2C+E">E. Ressouche</a>, <a href="/search/cond-mat?searchtype=author&query=Stenning%2C+G+B+G">G. B. G. Stenning</a>, <a href="/search/cond-mat?searchtype=author&query=Spratt%2C+J">J. Spratt</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.09368v1-abstract-short" style="display: inline;"> We report a comprehensive experimental investigation of the magnetic structure of the cycloidal phase in Ca$_3$Ru$_2$O$_7$, which mediates the spin reorientation transition, and establishes its magnetic phase diagram. In zero applied field, single-crystal neutron diffraction data confirms the scenario deduced from an earlier resonant x-ray scattering study: between $46.7$~K $< T < 49.0$~K the magn… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.09368v1-abstract-full').style.display = 'inline'; document.getElementById('2208.09368v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.09368v1-abstract-full" style="display: none;"> We report a comprehensive experimental investigation of the magnetic structure of the cycloidal phase in Ca$_3$Ru$_2$O$_7$, which mediates the spin reorientation transition, and establishes its magnetic phase diagram. In zero applied field, single-crystal neutron diffraction data confirms the scenario deduced from an earlier resonant x-ray scattering study: between $46.7$~K $< T < 49.0$~K the magnetic moments form a cycloid in the $a-b$ plane with a propagation wavevector of $(未,0,1)$ with $未\simeq 0.025$ and an ordered moment of about 1 $渭_{\rm{B}}$, with the eccentricity of the cycloid evolving with temperature. In an applied magnetic field applied parallel to the $b$-axis, the intensity of the $(未,0,1)$ satellite peaks decreases continuously up to about $渭_0 H \simeq 5$ T, above which field the system becomes field polarised. Both the eccentricity of the cycloid and the wavevector increase with field, the latter suggesting an enhancement of the anti$-$symmetric Dzyaloshinskii$-$Moriya interaction via magnetostriction effects. Transitions between the various low-temperature magnetic phases have been carefully mapped out using magnetometry and resistivity. The resulting phase diagram reveals that the cycloid phase exists in a temperature window that expands rapidly with increasing field, before transitioning to a polarised paramagnetic state at 5 T. High-field magnetoresistance measurements show that below $T\simeq 70$ K the resistivity increases continuously with decreasing temperature, indicating the inherent insulating nature at low temperatures of our high-quality, untwinned, single-crystals. We discuss our results with reference to previous reports of the magnetic phase diagram of Ca$_3$Ru$_2$O$_7$ that utilised samples which were more metallic and/or poly-domain. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.09368v1-abstract-full').style.display = 'none'; document.getElementById('2208.09368v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 11 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.03148">arXiv:2208.03148</a> <span> [<a href="https://arxiv.org/pdf/2208.03148">pdf</a>, <a href="https://arxiv.org/format/2208.03148">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.106.064436">10.1103/PhysRevB.106.064436 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum critical spin-liquid-like behavior in S = 1/2 quasikagome lattice CeRh1-xPdxSn investigated using muon spin relaxation and neutron scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Tripathi%2C+R">Rajesh Tripathi</a>, <a href="/search/cond-mat?searchtype=author&query=Adroja%2C+D+T">D. T. Adroja</a>, <a href="/search/cond-mat?searchtype=author&query=Ritter%2C+C">C. Ritter</a>, <a href="/search/cond-mat?searchtype=author&query=Sharma%2C+S">Shivani Sharma</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+C">Chongli Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Hillier%2C+A+D">A. D. Hillier</a>, <a href="/search/cond-mat?searchtype=author&query=Koza%2C+M+M">M. M. Koza</a>, <a href="/search/cond-mat?searchtype=author&query=Demmel%2C+F">F. Demmel</a>, <a href="/search/cond-mat?searchtype=author&query=Sundaresan%2C+A">A. Sundaresan</a>, <a href="/search/cond-mat?searchtype=author&query=Langridge%2C+S">S. Langridge</a>, <a href="/search/cond-mat?searchtype=author&query=Higemoto%2C+W">Wataru Higemoto</a>, <a href="/search/cond-mat?searchtype=author&query=Ito%2C+T+U">Takashi U. Ito</a>, <a href="/search/cond-mat?searchtype=author&query=Strydom%2C+A+M">A. M. Strydom</a>, <a href="/search/cond-mat?searchtype=author&query=Stenning%2C+G+B+G">G. B. G. Stenning</a>, <a href="/search/cond-mat?searchtype=author&query=Bhattacharyya%2C+A">A. Bhattacharyya</a>, <a href="/search/cond-mat?searchtype=author&query=Keen%2C+D">David Keen</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+H+C">H. C. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Pratt%2C+F">Francis Pratt</a>, <a href="/search/cond-mat?searchtype=author&query=Si%2C+Q">Qimiao Si</a>, <a href="/search/cond-mat?searchtype=author&query=Takabatake%2C+T">T. Takabatake</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.03148v1-abstract-short" style="display: inline;"> We present the results of muon spin relaxation ($渭$SR) and neutron scattering on the Ce-based quasikagome lattice CeRh$_{1-x}$Pd$_{x}$Sn ($x=0.1$ to 0.75). Our ZF-$渭$SR results reveal the absence of static long-range magnetic order down to 0.05~K in $x = 0.1$ single crystals. The weak temperature-dependent plateaus of the dynamic spin fluctuations below 0.2~K in ZF-$渭$SR together with its longitud… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.03148v1-abstract-full').style.display = 'inline'; document.getElementById('2208.03148v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.03148v1-abstract-full" style="display: none;"> We present the results of muon spin relaxation ($渭$SR) and neutron scattering on the Ce-based quasikagome lattice CeRh$_{1-x}$Pd$_{x}$Sn ($x=0.1$ to 0.75). Our ZF-$渭$SR results reveal the absence of static long-range magnetic order down to 0.05~K in $x = 0.1$ single crystals. The weak temperature-dependent plateaus of the dynamic spin fluctuations below 0.2~K in ZF-$渭$SR together with its longitudinal-field (LF) dependence between 0 and 3~kG indicate the presence of dynamic spin fluctuations persisting even at $T$ = 0.05~K without static magnetic order. On the other hand, $C_{\text{4f}}$/$T$ increases as --log $T$ on cooling below 0.9~K, passes through a broad maximum at 0.13~K and slightly decreases on further cooling. The ac-susceptibility also exhibits a frequency independent broad peak at 0.16~K, which is prominent with an applied field $H$ along $c$-direction. We, therefore, argue that such a behavior for $x=0.1$ (namely, a plateau in spin relaxation rate ($位$) below 0.2~K and a linear $T$ dependence in $C_{\text{4f}}$ below 0.13~K) can be attributed to a metallic spin-liquid (SL) ground state near the quantum critical point in the frustrated Kondo lattice. The LF-$渭$SR study suggests that the out of kagome plane spin fluctuations are responsible for the SL behavior. Low energy inelastic neutron scattering (INS) of $x$ = 0.1 reveals gapless magnetic excitations, which are also supported by the behavior of $C_{\text{4f}}$ proportional to $T^{1.1}$ down to 0.06~K. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.03148v1-abstract-full').style.display = 'none'; document.getElementById('2208.03148v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages and 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 106, 064436 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.01284">arXiv:2207.01284</a> <span> [<a href="https://arxiv.org/pdf/2207.01284">pdf</a>, <a href="https://arxiv.org/format/2207.01284">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.107.014415">10.1103/PhysRevB.107.014415 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> One-Dimensional Quantum Magnetism in the S = 1/2 Mo(V) system, KMoOP2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Abdeldaim%2C+A+H">Aly H. Abdeldaim</a>, <a href="/search/cond-mat?searchtype=author&query=Tsirlin%2C+A+A">Alexander A. Tsirlin</a>, <a href="/search/cond-mat?searchtype=author&query=Ollivier%2C+J">Jacques Ollivier</a>, <a href="/search/cond-mat?searchtype=author&query=Ritter%2C+C">Clemens Ritter</a>, <a href="/search/cond-mat?searchtype=author&query=Fortes%2C+D">Dominic Fortes</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">Robin S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Clark%2C+L">Lucy Clark</a>, <a href="/search/cond-mat?searchtype=author&query=Nilsen%2C+G+J">G酶ran J. Nilsen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.01284v2-abstract-short" style="display: inline;"> We present a comprehensive experimental and ab-initio study of the $S=1/2$ Mo$^{5+}$ system, KMoOP$_2$O$_7$, and show that it realizes the $S = 1/2$ Heisenberg chain antiferromagnet model. Powder neutron diffraction reveals that KMoOP$_2$O$_7$ forms a magnetic network comprised of pairs of Mo$^{5+}$ chains within its monoclinic $P2_1/n$ structure. Antiferromagnetic interactions within the Mo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.01284v2-abstract-full').style.display = 'inline'; document.getElementById('2207.01284v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.01284v2-abstract-full" style="display: none;"> We present a comprehensive experimental and ab-initio study of the $S=1/2$ Mo$^{5+}$ system, KMoOP$_2$O$_7$, and show that it realizes the $S = 1/2$ Heisenberg chain antiferromagnet model. Powder neutron diffraction reveals that KMoOP$_2$O$_7$ forms a magnetic network comprised of pairs of Mo$^{5+}$ chains within its monoclinic $P2_1/n$ structure. Antiferromagnetic interactions within the Mo$^{5+}$ chains are identified through magnetometry measurements and confirmed by analysis of the magnetic specific heat. The latter reveals a broad feature centred on $T_\textrm{N} = 0.54$ K, which we ascribe to the onset of long-range antiferromagnetic order. No magnetic Bragg scattering is observed in powder neutron diffraction data collected at 0.05 K, however, which is consistent with a strongly suppressed ordered moment with an upper limit $渭_\textrm{ord} < 0.15 渭_\textrm{B}$. The one-dimensional character of the magnetic correlations in KMoOP$_2$O$_7$ is verified through analysis of inelastic neutron scattering data, resulting in a model with $J_\textrm{1} \approx 34$ K and $J_\textrm{2} \approx -2$ K for the intrachain and interchain exchange interactions, respectively. The origin of these experimental findings are addressed through density-functional theory calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.01284v2-abstract-full').style.display = 'none'; document.getElementById('2207.01284v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.11588">arXiv:2110.11588</a> <span> [<a href="https://arxiv.org/pdf/2110.11588">pdf</a>, <a href="https://arxiv.org/format/2110.11588">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.104.L201111">10.1103/PhysRevB.104.L201111 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic order, disorder, and excitations under pressure in the Mott insulator Sr$_2$IrO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+X">Xiang Li</a>, <a href="/search/cond-mat?searchtype=author&query=Cooper%2C+S+E">S. E. Cooper</a>, <a href="/search/cond-mat?searchtype=author&query=Krishnadas%2C+A">A. Krishnadas</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Torre%2C+A">A. de la Torre</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">F. Baumberger</a>, <a href="/search/cond-mat?searchtype=author&query=Silevitch%2C+D+M">D. M. Silevitch</a>, <a href="/search/cond-mat?searchtype=author&query=Hsieh%2C+D">D. Hsieh</a>, <a href="/search/cond-mat?searchtype=author&query=Rosenbaum%2C+T+F">T. F. Rosenbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+Y">Yejun Feng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.11588v1-abstract-short" style="display: inline;"> Protected by the interplay of on-site Coulomb interactions and spin-orbit coupling, Sr$_2$IrO$_4$ at high pressure is a rare example of a Mott insulator with a paramagnetic ground state. Here, using optical Raman scattering, we measure both the phonon and magnon evolution in Sr$_2$IrO$_4$ under pressure, and identify three different magnetically-ordered phases, culminating in a spin-disordered sta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.11588v1-abstract-full').style.display = 'inline'; document.getElementById('2110.11588v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.11588v1-abstract-full" style="display: none;"> Protected by the interplay of on-site Coulomb interactions and spin-orbit coupling, Sr$_2$IrO$_4$ at high pressure is a rare example of a Mott insulator with a paramagnetic ground state. Here, using optical Raman scattering, we measure both the phonon and magnon evolution in Sr$_2$IrO$_4$ under pressure, and identify three different magnetically-ordered phases, culminating in a spin-disordered state beyond 18 GPa. A strong first-order structural phase transition drives the magnetic evolution at $\sim$10 GPa with reduced structural anisotropy in the IrO$_6$ cages, leading to increasingly isotropic exchange interactions between the Heisenberg spins and a spin-flip transition to $c$-axis-aligned antiferromagnetic order. In the disordered phase of Heisenberg $J_\mathrm{eff}=1/2$ pseudospins, the spin excitations are quasi-elastic and continuous to 10 meV, potentially hosting a gapless quantum spin liquid in Sr$_2$IrO$_4$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.11588v1-abstract-full').style.display = 'none'; document.getElementById('2110.11588v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 114, L201111 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.02209">arXiv:2108.02209</a> <span> [<a href="https://arxiv.org/pdf/2108.02209">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41535-022-00480-4">10.1038/s41535-022-00480-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Valence bond glass state in the 4$d^1$ fcc antiferromagnet Ba$_2$LuMoO$_6$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mustonen%2C+O">O. Mustonen</a>, <a href="/search/cond-mat?searchtype=author&query=Mutch%2C+H">H. Mutch</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+H+C">H. C. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Baker%2C+P+J">P. J. Baker</a>, <a href="/search/cond-mat?searchtype=author&query=Coomer%2C+F+C">F. C. Coomer</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Pughe%2C+C">C. Pughe</a>, <a href="/search/cond-mat?searchtype=author&query=Stenning%2C+G+B+G">G. B. G. Stenning</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+C">C. Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Dutton%2C+S+E">S. E. Dutton</a>, <a href="/search/cond-mat?searchtype=author&query=Cussen%2C+E+J">E. J. Cussen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.02209v3-abstract-short" style="display: inline;"> $B$-site ordered 4$d^1$ and 5$d^1$ double perovskites have a number of potential novel ground states including multipolar order, quantum spin liquids and valence bond glass states. These arise from the complex interactions of spin-orbital entangled $J_{eff}$ = 3/2 pseudospins on the geometrically frustrated fcc lattice. The 4$d^1$ Mo$^{5+}$ perovskite Ba$_2$YMoO$_6… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.02209v3-abstract-full').style.display = 'inline'; document.getElementById('2108.02209v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.02209v3-abstract-full" style="display: none;"> $B$-site ordered 4$d^1$ and 5$d^1$ double perovskites have a number of potential novel ground states including multipolar order, quantum spin liquids and valence bond glass states. These arise from the complex interactions of spin-orbital entangled $J_{eff}$ = 3/2 pseudospins on the geometrically frustrated fcc lattice. The 4$d^1$ Mo$^{5+}$ perovskite Ba$_2$YMoO$_6$ has been suggested to have a valence bond glass ground state. Here we report on the low temperature properties of powder samples of isostructural Ba$_2$LuMoO$_6$: the only other known cubic 4$d^1$ perovskite with one magnetic cation. Our muon spectroscopy experiments show that magnetism in this material remains dynamic down to 60 mK without any spin freezing or magnetic order. A singlet-triplet excitation with a gap of $螖$ = 28 meV is observed in inelastic neutron scattering. These results are interpreted as a disordered valence bond glass ground state similar to Ba$_2$YMoO$_6$. Our results highlight the differences of the 4$d^1$ double perovskites in comparison to cubic 5$d^1$ analogues, which have both magnetic and multipolar order. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.02209v3-abstract-full').style.display = 'none'; document.getElementById('2108.02209v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23+4 pages, 5+5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> npj Quantum Mater. 7, 74 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.15854">arXiv:2106.15854</a> <span> [<a href="https://arxiv.org/pdf/2106.15854">pdf</a>, <a href="https://arxiv.org/format/2106.15854">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-021-26068-3">10.1038/s41467-021-26068-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic-field-controlled spin fluctuations and quantum criticality in Sr3Ru2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lester%2C+C">C. Lester</a>, <a href="/search/cond-mat?searchtype=author&query=Ramos%2C+S">S. Ramos</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Croft%2C+T+P">T. P. Croft</a>, <a href="/search/cond-mat?searchtype=author&query=Laver%2C+M">M. Laver</a>, <a href="/search/cond-mat?searchtype=author&query=Bewley%2C+R+I">R. I. Bewley</a>, <a href="/search/cond-mat?searchtype=author&query=Guidi%2C+T">T. Guidi</a>, <a href="/search/cond-mat?searchtype=author&query=Hiess%2C+A">A. Hiess</a>, <a href="/search/cond-mat?searchtype=author&query=Wildes%2C+A">A. Wildes</a>, <a href="/search/cond-mat?searchtype=author&query=Forgan%2C+E+M">E. M. Forgan</a>, <a href="/search/cond-mat?searchtype=author&query=Hayden%2C+S+M">S. M. Hayden</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2106.15854v2-abstract-short" style="display: inline;"> When the transition temperature of a continuous phase transition is tuned to absolute zero, new ordered phases and physical behaviour emerge in the vicinity of the resulting quantum critical point. Sr3Ru2O7 can be tuned through quantum criticality with magnetic field at low temperature. Near its critical field Bc it displays the hallmark T-linear resistivity and a T log(1/T) electronic heat capaci… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.15854v2-abstract-full').style.display = 'inline'; document.getElementById('2106.15854v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.15854v2-abstract-full" style="display: none;"> When the transition temperature of a continuous phase transition is tuned to absolute zero, new ordered phases and physical behaviour emerge in the vicinity of the resulting quantum critical point. Sr3Ru2O7 can be tuned through quantum criticality with magnetic field at low temperature. Near its critical field Bc it displays the hallmark T-linear resistivity and a T log(1/T) electronic heat capacity behaviour of strange metals. However, these behaviours have not been related to any critical fluctuations. Here we use inelastic neutron scattering to reveal the presence of collective spin fluctuations whose relaxation time and strength show a nearly singular variation with magnetic field as Bc is approached. The large increase in the electronic heat capacity and entropy near Bc can be understood quantitatively in terms of the scattering of conduction electrons by these spin-fluctuations. On entering the spin density wave (SDW) phase present near Bc, the fluctuations become stronger suggesting that the SDW order is stabilised through an "order-by-disorder" mechanism. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.15854v2-abstract-full').style.display = 'none'; document.getElementById('2106.15854v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 12, 5798 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.03740">arXiv:2105.03740</a> <span> [<a href="https://arxiv.org/pdf/2105.03740">pdf</a>, <a href="https://arxiv.org/format/2105.03740">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Evidence for strong electron correlations in a non-symmorphic Dirac semimetal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hsu%2C+Y">Yu-Te Hsu</a>, <a href="/search/cond-mat?searchtype=author&query=Prishchenko%2C+D">Danil Prishchenko</a>, <a href="/search/cond-mat?searchtype=author&query=Berben%2C+M">Maarten Berben</a>, <a href="/search/cond-mat?searchtype=author&query=%C4%8Culo%2C+M">Matija 膶ulo</a>, <a href="/search/cond-mat?searchtype=author&query=Wiedmann%2C+S">Steffen Wiedmann</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">Emily C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Tinnemans%2C+P">Paul Tinnemans</a>, <a href="/search/cond-mat?searchtype=author&query=Takayama%2C+T">Tomohiro Takayama</a>, <a href="/search/cond-mat?searchtype=author&query=Mazurenko%2C+V">Vladimir Mazurenko</a>, <a href="/search/cond-mat?searchtype=author&query=Hussey%2C+N+E">Nigel E. Hussey</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">Robin S. Perry</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2105.03740v2-abstract-short" style="display: inline;"> Metallic iridium oxides (iridates) provide a fertile playground to explore new phenomena resulting from the interplay between topological protection, spin-orbit and electron-electron interactions. To date, however, few studies of the low energy electronic excitations exist due to the difficulty in synthesising crystals with sufficiently large carrier mean-free-paths. Here, we report the observatio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.03740v2-abstract-full').style.display = 'inline'; document.getElementById('2105.03740v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.03740v2-abstract-full" style="display: none;"> Metallic iridium oxides (iridates) provide a fertile playground to explore new phenomena resulting from the interplay between topological protection, spin-orbit and electron-electron interactions. To date, however, few studies of the low energy electronic excitations exist due to the difficulty in synthesising crystals with sufficiently large carrier mean-free-paths. Here, we report the observation of Shubnikov-de Haas quantum oscillations in high-quality single crystals of monoclinic SrIrO$_3$ in magnetic fields up to 35~T. Analysis of the oscillations reveals a Fermi surface comprising multiple small pockets with effective masses up to 4.5 times larger than the calculated band mass. \textit{Ab-initio} calculations reveal robust linear band-crossings at the Brillouin zone boundary, due to its non-symmorphic symmetry, and overall we find good agreement between the angular dependence of the oscillations and the theoretical expectations. Further evidence of strong electron correlations is realized through the observation of signatures of non-Fermi liquid transport as well as a large Kadowaki-Woods ratio. These collective findings, coupled with knowledge of the evolution of the electronic state across the Ruddlesden-Popper iridate series, establishes monoclinic SrIrO$_3$ as a topological semimetal on the boundary of the Mott metal-insulator transition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.03740v2-abstract-full').style.display = 'none'; document.getElementById('2105.03740v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> npj Quantum Materials 6, 92 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2101.10571">arXiv:2101.10571</a> <span> [<a href="https://arxiv.org/pdf/2101.10571">pdf</a>, <a href="https://arxiv.org/format/2101.10571">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.103.024503">10.1103/PhysRevB.103.024503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nodeless superconductivity in Lu$_{5-x}$Rh$_6$Sn$_{18+x}$ with broken time reversal symmetry </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+A">A. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Nie%2C+Z+Y">Z. Y. Nie</a>, <a href="/search/cond-mat?searchtype=author&query=Du%2C+F">F. Du</a>, <a href="/search/cond-mat?searchtype=author&query=Pang%2C+G+M">G. M. Pang</a>, <a href="/search/cond-mat?searchtype=author&query=Kase%2C+N">N. Kase</a>, <a href="/search/cond-mat?searchtype=author&query=Akimitsu%2C+J">J. Akimitsu</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Gutmann%2C+M+J">M. J. Gutmann</a>, <a href="/search/cond-mat?searchtype=author&query=Adroja%2C+D+T">D. T. Adroja</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+C">C. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Smidman%2C+M">M. Smidman</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+H+Q">H. Q. Yuan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2101.10571v1-abstract-short" style="display: inline;"> Evidence for broken time reversal symmetry (TRS) has been found in the superconducting states of the $R_5$Rh$_6$Sn$_{18}$ (R = Sc, Y, Lu) compounds with a centrosymmetric caged crystal structure, but the origin of this phenomenon is unresolved. Here we report neutron diffraction measurements of single crystals with $R$=Lu, as well as measurements of the temperature dependence of the magnetic penet… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.10571v1-abstract-full').style.display = 'inline'; document.getElementById('2101.10571v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2101.10571v1-abstract-full" style="display: none;"> Evidence for broken time reversal symmetry (TRS) has been found in the superconducting states of the $R_5$Rh$_6$Sn$_{18}$ (R = Sc, Y, Lu) compounds with a centrosymmetric caged crystal structure, but the origin of this phenomenon is unresolved. Here we report neutron diffraction measurements of single crystals with $R$=Lu, as well as measurements of the temperature dependence of the magnetic penetration depth using a self-induced tunnel diode-oscillator (TDO) based technique, together with band structure calculations using density functional theory. Neutron diffraction measurements reveal that the system crystallizes in a tetragonal caged structure, and that one of nominal Lu sites in the Lu$_5$Rh$_6$Sn$_{18}$ structure is occupied by Sn, yielding a composition Lu$_{5-x}$Rh$_6$Sn$_{18+x}$ ($x=1$). The low temperature penetration depth shift $螖位(T)$ exhibits an exponential temperature dependence below around $0.3T_c$, giving clear evidence for fully gapped superconductivity. The derived superfluid density is reasonably well accounted for by a single gap $s$-wave model, whereas agreement cannot be found for models of TRS breaking states with two-component order parameters. Moreover, band structure calculations reveal multiple bands crossing the Fermi level, and indicate that the aforementioned TRS breaking states would be expected to have nodes on the Fermi surface, in constrast to the observations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.10571v1-abstract-full').style.display = 'none'; document.getElementById('2101.10571v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 103, 024503 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.05008">arXiv:2012.05008</a> <span> [<a href="https://arxiv.org/pdf/2012.05008">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41535-020-00292-4">10.1038/s41535-020-00292-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct comparison of ARPES, STM, and quantum oscillation data for band structure determination in Sr$_2$RhO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Battisti%2C+I">I. Battisti</a>, <a href="/search/cond-mat?searchtype=author&query=Tromp%2C+W+O">W. O. Tromp</a>, <a href="/search/cond-mat?searchtype=author&query=Ricc%C3%B2%2C+S">S. Ricc貌</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a>, <a href="/search/cond-mat?searchtype=author&query=Tamai%2C+A">A. Tamai</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">F. Baumberger</a>, <a href="/search/cond-mat?searchtype=author&query=Allan%2C+M+P">M. P. Allan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2012.05008v1-abstract-short" style="display: inline;"> Discrepancies in the low-energy quasiparticle dispersion extracted from angle resolved photoemission, scanning tunneling spectroscopy and quantum oscillation data are common and have long haunted the field of quantum matter physics. Here, we directly test the consistency of results from these three techniques by comparing data from the correlated metal Sr$_2$RhO$_4$. Using established schemes for… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.05008v1-abstract-full').style.display = 'inline'; document.getElementById('2012.05008v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.05008v1-abstract-full" style="display: none;"> Discrepancies in the low-energy quasiparticle dispersion extracted from angle resolved photoemission, scanning tunneling spectroscopy and quantum oscillation data are common and have long haunted the field of quantum matter physics. Here, we directly test the consistency of results from these three techniques by comparing data from the correlated metal Sr$_2$RhO$_4$. Using established schemes for the interpretation of the experimental data, we find good agreement for the Fermi surface topography and carrier effective masses. Hence, the apparent absence of such an agreement in other quantum materials, including the cuprates, suggests that the electronic states in these materials are of different, non-Fermi liquid like nature. Finally, we discuss the potential and challenges in extracting carrier lifetimes from photoemission and quasiparticle interference data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.05008v1-abstract-full').style.display = 'none'; document.getElementById('2012.05008v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> npj Quantum Mater. 5, 91 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.07105">arXiv:2009.07105</a> <span> [<a href="https://arxiv.org/pdf/2009.07105">pdf</a>, <a href="https://arxiv.org/format/2009.07105">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevMaterials.4.094202">10.1103/PhysRevMaterials.4.094202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Correlated electron metal properties of the honeycomb ruthenate Na$_2$RuO$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Veiga%2C+L+S+I">L. S. I. Veiga</a>, <a href="/search/cond-mat?searchtype=author&query=Etter%2C+M">M. Etter</a>, <a href="/search/cond-mat?searchtype=author&query=Cappelli%2C+E">E. Cappelli</a>, <a href="/search/cond-mat?searchtype=author&query=Jacobsen%2C+H">H. Jacobsen</a>, <a href="/search/cond-mat?searchtype=author&query=Vale%2C+J+G">J. G. Vale</a>, <a href="/search/cond-mat?searchtype=author&query=Dashwood%2C+C+D">C. D Dashwood</a>, <a href="/search/cond-mat?searchtype=author&query=Le%2C+D">D. Le</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">F. Baumberger</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.07105v1-abstract-short" style="display: inline;"> We report the synthesis and characterisation of polycrystalline Na$_2$RuO$_3$, a layered material in which the Ru$^{4+}$ ($4d^4$ configuration) form a honeycomb lattice. The optimal synthesis condition was found to produce a nearly ordered Na$_2$RuO$_3$ ($C2/c$ phase), as assessed from the refinement of the time-of-flight neutron powder diffraction. Magnetic susceptibility measurements reveal a la… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.07105v1-abstract-full').style.display = 'inline'; document.getElementById('2009.07105v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.07105v1-abstract-full" style="display: none;"> We report the synthesis and characterisation of polycrystalline Na$_2$RuO$_3$, a layered material in which the Ru$^{4+}$ ($4d^4$ configuration) form a honeycomb lattice. The optimal synthesis condition was found to produce a nearly ordered Na$_2$RuO$_3$ ($C2/c$ phase), as assessed from the refinement of the time-of-flight neutron powder diffraction. Magnetic susceptibility measurements reveal a large temperature-independent Pauli paramagnetism ($蠂_0 \sim 1.42(2)\times10^{-3}$ emu/mol Oe) with no evidence of magnetic ordering down to 1.5 K, and with an absence of dynamic magnetic correlations, as evidenced by neutron scattering spectroscopy. The intrinsic susceptibility ($蠂_0$) together with the Sommerfeld coeficient of $纬=11.7(2)$ mJ/Ru mol K$^2$ estimated from heat capacity measurements, gives an enhanced Wilson ratio of $R_W\approx8.9(1)$, suggesting that magnetic correlations may be present in this material. While transport measurements on pressed pellets show nonmetallic behaviour, photoemission spectrocopy indicate a small but finite density of states at the Fermi energy, suggesting that the bulk material is metallic. Except for resistivity measurements, which may have been compromised by near surface and interface effects, all other probes indicate that Na$_2$RuO$_3$ is a moderately correlated electron metal. Our results thus stand in contrast to earlier reports that Na$_2$RuO$_3$ is an antiferromagnetic insulator at low temperatures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.07105v1-abstract-full').style.display = 'none'; document.getElementById('2009.07105v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Materials 4, 094202 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.12882">arXiv:2006.12882</a> <span> [<a href="https://arxiv.org/pdf/2006.12882">pdf</a>, <a href="https://arxiv.org/format/2006.12882">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.102.180410">10.1103/PhysRevB.102.180410 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spontaneous cycloidal order mediating a spin-reorientation transition in a polar metal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Dashwood%2C+C+D">C. D. Dashwood</a>, <a href="/search/cond-mat?searchtype=author&query=Veiga%2C+L+S+I">L. S. I. Veiga</a>, <a href="/search/cond-mat?searchtype=author&query=Faure%2C+Q">Q. Faure</a>, <a href="/search/cond-mat?searchtype=author&query=Vale%2C+J+G">J. G. Vale</a>, <a href="/search/cond-mat?searchtype=author&query=Porter%2C+D+G">D. G. Porter</a>, <a href="/search/cond-mat?searchtype=author&query=Collins%2C+S+P">S. P. Collins</a>, <a href="/search/cond-mat?searchtype=author&query=Manuel%2C+P">P. Manuel</a>, <a href="/search/cond-mat?searchtype=author&query=Khalyavin%2C+D+D">D. D. Khalyavin</a>, <a href="/search/cond-mat?searchtype=author&query=Orlandi%2C+F">F. Orlandi</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+R+D">R. D. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.12882v2-abstract-short" style="display: inline;"> We show how complex modulated order can spontaneously emerge when magnetic interactions compete in a metal with polar lattice distortions. Combining neutron and resonant x-ray scattering with symmetry analysis, we reveal that the spin reorientation in Ca$_3$Ru$_2$O$_7$ is mediated by a magnetic cycloid whose eccentricity evolves smoothly but rapidly with temperature. We find the cycloid to be high… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12882v2-abstract-full').style.display = 'inline'; document.getElementById('2006.12882v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.12882v2-abstract-full" style="display: none;"> We show how complex modulated order can spontaneously emerge when magnetic interactions compete in a metal with polar lattice distortions. Combining neutron and resonant x-ray scattering with symmetry analysis, we reveal that the spin reorientation in Ca$_3$Ru$_2$O$_7$ is mediated by a magnetic cycloid whose eccentricity evolves smoothly but rapidly with temperature. We find the cycloid to be highly sensitive to magnetic fields, which appear to continuously generate higher harmonic modulations. Our results provide a unified picture of the rich magnetic phases of this correlated, multi-band polar metal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12882v2-abstract-full').style.display = 'none'; document.getElementById('2006.12882v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures (+ 11 pages, 3 figures of supplemental material)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 102, 180410(R) (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.05551">arXiv:1910.05551</a> <span> [<a href="https://arxiv.org/pdf/1910.05551">pdf</a>, <a href="https://arxiv.org/format/1910.05551">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-648X/ab2217">10.1088/1361-648X/ab2217 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Selective probing of magnetic order on Tb and Ir sites in stuffed Tb$_{2+x}$Ir$_{2-x}$O$_{7-y}$ using resonant X-ray scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Donnerer%2C+C">C. Donnerer</a>, <a href="/search/cond-mat?searchtype=author&query=Rahn%2C+M+C">M. C. Rahn</a>, <a href="/search/cond-mat?searchtype=author&query=Schierle%2C+E">E. Schierle</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Veiga%2C+L+S+I">L. S. I. Veiga</a>, <a href="/search/cond-mat?searchtype=author&query=Nisbet%2C+G">G. Nisbet</a>, <a href="/search/cond-mat?searchtype=author&query=Collins%2C+S+P">S. P. Collins</a>, <a href="/search/cond-mat?searchtype=author&query=Prabhakaran%2C+D">D. Prabhakaran</a>, <a href="/search/cond-mat?searchtype=author&query=Boothroyd%2C+A+T">A. T. Boothroyd</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.05551v1-abstract-short" style="display: inline;"> We study the magnetic structure of the "stuffed" (Tb-rich) pyrochlore iridate Tb$_{2+x}$Ir$_{2-x}$O$_{7-y}$, using resonant elastic x-ray scattering (REXS). In order to disentangle contributions from Tb and Ir magnetic sublattices, experiments were performed at the Ir $L_3$ and Tb $M_5$ edges, which provide selective sensitivity to Ir $5d$ and Tb $4f$ magnetic moments, respectively. At the Ir… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.05551v1-abstract-full').style.display = 'inline'; document.getElementById('1910.05551v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.05551v1-abstract-full" style="display: none;"> We study the magnetic structure of the "stuffed" (Tb-rich) pyrochlore iridate Tb$_{2+x}$Ir$_{2-x}$O$_{7-y}$, using resonant elastic x-ray scattering (REXS). In order to disentangle contributions from Tb and Ir magnetic sublattices, experiments were performed at the Ir $L_3$ and Tb $M_5$ edges, which provide selective sensitivity to Ir $5d$ and Tb $4f$ magnetic moments, respectively. At the Ir $L_3$ edge, we found the onset of long-range ${\bf k}={\bf 0}$ magnetic order below $T_{N}^\text{Ir}\sim$ 71 K, consistent with the expected signal of all-in all-out (AIAO) magnetic order. Using a single-ion model to calculate REXS cross-sections, we estimate an ordered magnetic moment of $渭_{5d}^{\text{Ir}} \approx 0.34(3)\,渭_B$ at 5 K. At the Tb $M_5$ edge, long-range ${\bf k}={\bf 0}$ magnetic order appeared below $\sim40$ K, also consistent with an AIAO magnetic structure on the Tb site. Additional insight into the magnetism of the Tb sublattice is gleaned from measurements at the $M_5$ edge in applied magnetic fields up to 6 T, which is found to completely suppress the Tb AIAO magnetic order. In zero applied field, the observed gradual onset of the Tb sublattice magnetisation with temperature suggests that it is induced by the magnetic order on the Ir site. The persistence of AIAO magnetic order, despite the greatly reduced ordering temperature and moment size compared to stoichiometric Tb$_{2}$Ir$_{2}$O$_{7}$, for which $T_{N}^{\text{Ir}} =130$ K and $渭_{5d}^{\text{Ir}}=0.56\,渭_B$, indicates that stuffing could be a viable means of tuning the strength of electronic correlations, thereby potentially offering a new strategy to achieve topologically non-trivial band crossings in pyrochlore iridates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.05551v1-abstract-full').style.display = 'none'; document.getElementById('1910.05551v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 31 (2019) 344001 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.09519">arXiv:1907.09519</a> <span> [<a href="https://arxiv.org/pdf/1907.09519">pdf</a>, <a href="https://arxiv.org/ps/1907.09519">ps</a>, <a href="https://arxiv.org/format/1907.09519">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1107/S1600577519008877">10.1107/S1600577519008877 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Resonant inelastic x-ray scattering of magnetic excitations under pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Rossi%2C+M">Matteo Rossi</a>, <a href="/search/cond-mat?searchtype=author&query=Henriquet%2C+C">Christian Henriquet</a>, <a href="/search/cond-mat?searchtype=author&query=Jacobs%2C+J">Jeroen Jacobs</a>, <a href="/search/cond-mat?searchtype=author&query=Donnerer%2C+C">Christian Donnerer</a>, <a href="/search/cond-mat?searchtype=author&query=Boseggia%2C+S">Stefano Boseggia</a>, <a href="/search/cond-mat?searchtype=author&query=Al-Zein%2C+A">Ali Al-Zein</a>, <a href="/search/cond-mat?searchtype=author&query=Fumagalli%2C+R">Roberto Fumagalli</a>, <a href="/search/cond-mat?searchtype=author&query=Yao%2C+Y">Yi Yao</a>, <a href="/search/cond-mat?searchtype=author&query=Vale%2C+J+G">James G. Vale</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">Emily C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">Robin S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Kantor%2C+I">Innokenty Kantor</a>, <a href="/search/cond-mat?searchtype=author&query=Garbarino%2C+G">Gaston Garbarino</a>, <a href="/search/cond-mat?searchtype=author&query=Crichton%2C+W">Wilson Crichton</a>, <a href="/search/cond-mat?searchtype=author&query=Monaco%2C+G">Giulio Monaco</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">Desmond F. McMorrow</a>, <a href="/search/cond-mat?searchtype=author&query=Krisch%2C+M">Michael Krisch</a>, <a href="/search/cond-mat?searchtype=author&query=Sala%2C+M+M">Marco Moretti Sala</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.09519v1-abstract-short" style="display: inline;"> Resonant inelastic x-ray scattering (RIXS) is an extremely valuable tool for the study of elementary, including magnetic, excitations in matter. Latest developments of this technique mostly aimed at improving the energy resolution and performing polarization analysis of the scattered radiation, with a great impact on the interpretation and applicability of RIXS. Instead, this article focuses on th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.09519v1-abstract-full').style.display = 'inline'; document.getElementById('1907.09519v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.09519v1-abstract-full" style="display: none;"> Resonant inelastic x-ray scattering (RIXS) is an extremely valuable tool for the study of elementary, including magnetic, excitations in matter. Latest developments of this technique mostly aimed at improving the energy resolution and performing polarization analysis of the scattered radiation, with a great impact on the interpretation and applicability of RIXS. Instead, this article focuses on the sample environment and presents a setup for high-pressure low-temperature RIXS measurements of low-energy excitations. The feasibility of these experiments is proved by probing the magnetic excitations of the bilayer iridate Sr$_3$Ir$_2$O$_7$ at pressures up to 12 GPa. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.09519v1-abstract-full').style.display = 'none'; document.getElementById('1907.09519v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.10391">arXiv:1904.10391</a> <span> [<a href="https://arxiv.org/pdf/1904.10391">pdf</a>, <a href="https://arxiv.org/format/1904.10391">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.100.085131">10.1103/PhysRevB.100.085131 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Momentum-resolved lattice dynamics of parent and electron-doped Sr$_{2}$IrO$_{4}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Dashwood%2C+C+D">C. D. Dashwood</a>, <a href="/search/cond-mat?searchtype=author&query=Miao%2C+H">H. Miao</a>, <a href="/search/cond-mat?searchtype=author&query=Vale%2C+J+G">J. G. Vale</a>, <a href="/search/cond-mat?searchtype=author&query=Ishikawa%2C+D">D. Ishikawa</a>, <a href="/search/cond-mat?searchtype=author&query=Prishchenko%2C+D+A">D. A. Prishchenko</a>, <a href="/search/cond-mat?searchtype=author&query=Mazurenko%2C+V+V">V. V. Mazurenko</a>, <a href="/search/cond-mat?searchtype=author&query=Mazurenko%2C+V+G">V. G. Mazurenko</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+G">G. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Torre%2C+A">A. de la Torre</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">F. Baumberger</a>, <a href="/search/cond-mat?searchtype=author&query=Baron%2C+A+Q+R">A. Q. R. Baron</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+M+P+M">M. P. M. Dean</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1904.10391v2-abstract-short" style="display: inline;"> The mixing of orbital and spin character in the wave functions of the $5d$ iridates has led to predictions of strong couplings among their lattice, electronic and magnetic degrees of freedom. As well as realizing a novel spin-orbit assisted Mott-insulating ground state, the perovskite iridate Sr$_{2}$IrO$_{4}$ has strong similarities with the cuprate La$_{2}$CuO$_{4}$, which on doping hosts a char… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.10391v2-abstract-full').style.display = 'inline'; document.getElementById('1904.10391v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.10391v2-abstract-full" style="display: none;"> The mixing of orbital and spin character in the wave functions of the $5d$ iridates has led to predictions of strong couplings among their lattice, electronic and magnetic degrees of freedom. As well as realizing a novel spin-orbit assisted Mott-insulating ground state, the perovskite iridate Sr$_{2}$IrO$_{4}$ has strong similarities with the cuprate La$_{2}$CuO$_{4}$, which on doping hosts a charge-density wave that appears intimately connected to high-temperature superconductivity. These phenomena can be sensitively probed through momentum-resolved measurements of the lattice dynamics, made possible by meV-resolution inelastic x-ray scattering. Here we report the first such measurements for both parent and electron-doped Sr$_{2}$IrO$_{4}$. We find that the low-energy phonon dispersions and intensities in both compounds are well described by the same nonmagnetic density functional theory calculation. In the parent compound, no changes of the phonons on magnetic ordering are discernible within the experimental resolution, and in the doped compound no anomalies are apparent due to charge-density waves. These measurements extend our knowledge of the lattice properties of (Sr$_{1-x}$La$_{x}$)$_{2}$IrO$_{4}$ and constrain the couplings of the phonons to magnetic and charge order. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.10391v2-abstract-full').style.display = 'none'; document.getElementById('1904.10391v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 6 figures (+ 12 pages, 6 figures of supplemental material)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 100, 085131 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.08682">arXiv:1812.08682</a> <span> [<a href="https://arxiv.org/pdf/1812.08682">pdf</a>, <a href="https://arxiv.org/ps/1812.08682">ps</a>, <a href="https://arxiv.org/format/1812.08682">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-648X/ab0471">10.1088/1361-648X/ab0471 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Critical fluctuations in the spin-orbit Mott insulator Sr$_3$Ir$_2$O$_7$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Vale%2C+J+G">J. G. Vale</a>, <a href="/search/cond-mat?searchtype=author&query=Boseggia%2C+S">S. Boseggia</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+H+C">H. C. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Springell%2C+R+S">R. S. Springell</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Collins%2C+S+P">S. P. Collins</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.08682v2-abstract-short" style="display: inline;"> X-ray magnetic critical scattering measurements and specific heat measurements were performed on the perovskite iridate Sr$_3$Ir$_2$O$_7$. We find that the magnetic interactions close to the N茅el temperature $T_N$ = 283.4(2) K are three-dimensional. This contrasts with previous studies which suggest two-dimensional behaviour like Sr$_2$IrO$_4$. Violation of the Harris criterion ($d谓>2$) means that… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.08682v2-abstract-full').style.display = 'inline'; document.getElementById('1812.08682v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.08682v2-abstract-full" style="display: none;"> X-ray magnetic critical scattering measurements and specific heat measurements were performed on the perovskite iridate Sr$_3$Ir$_2$O$_7$. We find that the magnetic interactions close to the N茅el temperature $T_N$ = 283.4(2) K are three-dimensional. This contrasts with previous studies which suggest two-dimensional behaviour like Sr$_2$IrO$_4$. Violation of the Harris criterion ($d谓>2$) means that weak disorder becomes relevant. This leads a rounding of the antiferromagnetic phase transition at $T_N$, and modifies the critical exponents relative to the clean system. Specifically, we determine that the critical behaviour of Sr$_3$Ir$_2$O$_7$ is representative of the diluted 3D Ising universality class. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.08682v2-abstract-full').style.display = 'none'; document.getElementById('1812.08682v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted in Journal of Physics: Condensed Matter</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.11044">arXiv:1810.11044</a> <span> [<a href="https://arxiv.org/pdf/1810.11044">pdf</a>, <a href="https://arxiv.org/format/1810.11044">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.99.075125">10.1103/PhysRevB.99.075125 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Tuning of the Ru$^{\mathbf{4+}}$ ground-state orbital population in the $\mathbf{4d^4}$ Mott insulator Ca$_2$RuO$_4$ achieved by La doping </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Pincini%2C+D">D. Pincini</a>, <a href="/search/cond-mat?searchtype=author&query=Veiga%2C+L+S+I">L. S. I. Veiga</a>, <a href="/search/cond-mat?searchtype=author&query=Dashwood%2C+C+D">C. D. Dashwood</a>, <a href="/search/cond-mat?searchtype=author&query=Forte%2C+F">F. Forte</a>, <a href="/search/cond-mat?searchtype=author&query=Cuoco%2C+M">M. Cuoco</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Bencok%2C+P">P. Bencok</a>, <a href="/search/cond-mat?searchtype=author&query=Boothroyd%2C+A+T">A. T. Boothroyd</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1810.11044v2-abstract-short" style="display: inline;"> The ground-state orbital occupancy of the Ru$^{4+}$ ion in Ca$_{2-x}$La$_x$RuO$_4$ [x=0, 0.05(1), 0.07(1) and 0.12(1)] was investigated by performing X-ray absorption spectroscopy (XAS) in the vicinity of the O K edge as a function of angle between the incident beam and the surface of the crystals. A minimal model of the hybridization between the O 2p states probed at the K edge and the Ru 4d orbi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.11044v2-abstract-full').style.display = 'inline'; document.getElementById('1810.11044v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.11044v2-abstract-full" style="display: none;"> The ground-state orbital occupancy of the Ru$^{4+}$ ion in Ca$_{2-x}$La$_x$RuO$_4$ [x=0, 0.05(1), 0.07(1) and 0.12(1)] was investigated by performing X-ray absorption spectroscopy (XAS) in the vicinity of the O K edge as a function of angle between the incident beam and the surface of the crystals. A minimal model of the hybridization between the O 2p states probed at the K edge and the Ru 4d orbitals was used to analyze the XAS data, allowing the ratio of hole occupancies $n_{xy}/n_{yz,zx}$ to be determined as a function of doping and temperature. For the samples displaying a low-temperature insulating ground-state ($x\leq0.07$), $n_{xy}/n_{yz,zx}$ is found to increase significantly with increasing doping. For x=0.12, which has a metallic ground-state, the XAS spectra are found to be independent of temperature, and not to be describable by the minimal hybridization model. To understand the origin of the evolution of the electronic structure across the phase diagram, we have performed theoretical calculations based on a model Hamiltonian, comprising electron-electron correlations, crystal field ($螖$) and spin-orbit coupling ($位$), of a Ru-O-Ru cluster. Our calculations of the Ru hole occupancy as a function of $螖/位$ establish that the enhancement of $n_{xy}/n_{yz,zx}$ is driven by significant changes to the crystal field as the tetragonal distortion of the RuO$_6$ octahedral changes from compressive to tensile with La doping. It also shows that the hole occupancy of the O 2p and Ru 4d orbitals display the same trend as a function of $螖/位$, thus validating the minimal hybridization model. In essence, our results suggest that the predominant mechanism driving the emergence of the low-temperature metallic phase in La doped Ca$_2$RuO$_4$ is the structurally induced redistribution of holes within the t2g orbitals, rather that the injection of free carriers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.11044v2-abstract-full').style.display = 'none'; document.getElementById('1810.11044v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 99, 075125 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.06937">arXiv:1806.06937</a> <span> [<a href="https://arxiv.org/pdf/1806.06937">pdf</a>, <a href="https://arxiv.org/format/1806.06937">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.98.045107">10.1103/PhysRevB.98.045107 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Mott transition and collective charge pinning in electron doped Sr2IrO4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+K">K. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Bachar%2C+N">N. Bachar</a>, <a href="/search/cond-mat?searchtype=author&query=Teyssier%2C+J">J. Teyssier</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+W">W. Luo</a>, <a href="/search/cond-mat?searchtype=author&query=Rischau%2C+C+W">C. W. Rischau</a>, <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G">G. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Torre%2C+A">A. de la Torre</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">F. Baumberger</a>, <a href="/search/cond-mat?searchtype=author&query=van+der+Marel%2C+D">D. van der Marel</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1806.06937v1-abstract-short" style="display: inline;"> We studied the in-plane dynamic and static charge conductivity of electron doped Sr2IrO4 using optical spectroscopy and DC transport measurements. The optical conductivity indicates that the pristine material is an indirect semiconductor with a direct Mott-gap of 0.55 eV. Upon substitution of 2% La per formula unit the Mott-gap is suppressed except in a small fraction of the material (15%) where t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.06937v1-abstract-full').style.display = 'inline'; document.getElementById('1806.06937v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.06937v1-abstract-full" style="display: none;"> We studied the in-plane dynamic and static charge conductivity of electron doped Sr2IrO4 using optical spectroscopy and DC transport measurements. The optical conductivity indicates that the pristine material is an indirect semiconductor with a direct Mott-gap of 0.55 eV. Upon substitution of 2% La per formula unit the Mott-gap is suppressed except in a small fraction of the material (15%) where the gap survives, and overall the material remains insulating. Instead of a zero energy mode (or Drude peak) we observe a soft collective mode (SCM) with a broad maximum at 40 meV. Doping to 10% increases the strength of the SCM, and a zero-energy mode occurs together with metallic DC conductivity. Further increase of the La substitution doesn't change the spectral weight integral up to 3 eV. It does however result in a transfer of the SCM spectral weight to the zero-energy mode, with a corresponding reduction of the DC resistivity for all temperatures from 4 to 300 K. The presence of a zero-energy mode signals that at least part of the Fermi surface remains ungapped at low temperatures, whereas the SCM appears to be caused by pinning a collective frozen state involving part of the doped electrons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.06937v1-abstract-full').style.display = 'none'; document.getElementById('1806.06937v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 98, 045107 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1804.06708">arXiv:1804.06708</a> <span> [<a href="https://arxiv.org/pdf/1804.06708">pdf</a>, <a href="https://arxiv.org/ps/1804.06708">ps</a>, <a href="https://arxiv.org/format/1804.06708">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Nuclear resonant scattering from 193Ir as a probe of the electronic and magnetic properties of iridates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Alexeev%2C+P">Pavel Alexeev</a>, <a href="/search/cond-mat?searchtype=author&query=Leupold%2C+O">Olaf Leupold</a>, <a href="/search/cond-mat?searchtype=author&query=Sergueev%2C+I">Ilya Sergueev</a>, <a href="/search/cond-mat?searchtype=author&query=Herlitschke%2C+M">Marcus Herlitschke</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D">Desmond McMorrow</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=R%C3%B6hlsberger%2C+R">Ralf R枚hlsberger</a>, <a href="/search/cond-mat?searchtype=author&query=Wille%2C+H">Hans-Christian Wille</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1804.06708v1-abstract-short" style="display: inline;"> The high brilliance of the modern synchrotron radiation sources facilitates experiments with high energy x-rays. In this Letter we report on Nuclear Resonance Scattering at the 73 keV nuclear level in 193Ir. The transitions between the hyperfine split levels show an exceptionally large E2/M1 multi-polarity mixing ratio combined with an increased sensitivity to certain changes in the hyperfine fiel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.06708v1-abstract-full').style.display = 'inline'; document.getElementById('1804.06708v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1804.06708v1-abstract-full" style="display: none;"> The high brilliance of the modern synchrotron radiation sources facilitates experiments with high energy x-rays. In this Letter we report on Nuclear Resonance Scattering at the 73 keV nuclear level in 193Ir. The transitions between the hyperfine split levels show an exceptionally large E2/M1 multi-polarity mixing ratio combined with an increased sensitivity to certain changes in the hyperfine field direction compared to non-mixing transitions. The method opens a new way for probing local magnetic and electronic properties of correlated materials containing iridium and provides novel insights into their anisotropic magnetism. In particular, unexpected out-of-plane components of magnetic hyperfine fields and non-zero electric field gradients in Sr2IrO4 have been detected and attributed to the presence of strong spin-orbit interaction. Due to the high, 62% natural abundance of the 193Ir isotope, no isotopic enrichment of the samples is required, qualifying the method for a broad range of applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.06708v1-abstract-full').style.display = 'none'; document.getElementById('1804.06708v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.00488">arXiv:1803.00488</a> <span> [<a href="https://arxiv.org/pdf/1803.00488">pdf</a>, <a href="https://arxiv.org/format/1803.00488">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-018-06945-0">10.1038/s41467-018-06945-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-situ strain-tuning of the metal-insulator-transition of Ca$_{2}$RuO$_{4}$ in angle-resolved photoemission experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ricc%C3%B2%2C+S">S. Ricc貌</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+M">M. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Tamai%2C+A">A. Tamai</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+S+M">S. McKeown Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Bruno%2C+F+Y">F. Y. Bruno</a>, <a href="/search/cond-mat?searchtype=author&query=Cucchi%2C+I">I. Cucchi</a>, <a href="/search/cond-mat?searchtype=author&query=Cappelli%2C+E">E. Cappelli</a>, <a href="/search/cond-mat?searchtype=author&query=Besnard%2C+C">C. Besnard</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+T+K">T. K. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Dudin%2C+P">P. Dudin</a>, <a href="/search/cond-mat?searchtype=author&query=Hoesch%2C+M">M. Hoesch</a>, <a href="/search/cond-mat?searchtype=author&query=Gutmann%2C+M">M. Gutmann</a>, <a href="/search/cond-mat?searchtype=author&query=Georges%2C+A">A. Georges</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">F. Baumberger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1803.00488v2-abstract-short" style="display: inline;"> We report the evolution of the $k$-space electronic structure of lightly doped bulk Ca$_{2}$RuO$_{4}$ with uniaxial strain. Using ultrathin plate-like crystals, we achieve strain levels up to $-4.1\%$, sufficient to suppress the Mott phase and access the previously unexplored metallic state at low temperature. Angle-resolved photoemission experiments performed while tuning the uniaxial strain reve… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.00488v2-abstract-full').style.display = 'inline'; document.getElementById('1803.00488v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.00488v2-abstract-full" style="display: none;"> We report the evolution of the $k$-space electronic structure of lightly doped bulk Ca$_{2}$RuO$_{4}$ with uniaxial strain. Using ultrathin plate-like crystals, we achieve strain levels up to $-4.1\%$, sufficient to suppress the Mott phase and access the previously unexplored metallic state at low temperature. Angle-resolved photoemission experiments performed while tuning the uniaxial strain reveal that metallicity emerges from a marked redistribution of charge within the Ru $t_{2g}$ shell, accompanied by a sudden collapse of the spectral weight in the lower Hubbard band and the emergence of a well defined Fermi surface which is devoid of pseudogaps. Our results highlight the profound roles of lattice energetics and of the multiorbital nature of Ca$_{2}$RuO$_{4}$ in this archetypal Mott transition and open new perspectives for spectroscopic measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.00488v2-abstract-full').style.display = 'none'; document.getElementById('1803.00488v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">To appear in Nature Communications</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 9, 4535 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1801.02234">arXiv:1801.02234</a> <span> [<a href="https://arxiv.org/pdf/1801.02234">pdf</a>, <a href="https://arxiv.org/ps/1801.02234">ps</a>, <a href="https://arxiv.org/format/1801.02234">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.97.035106">10.1103/PhysRevB.97.035106 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-pressure insulator-to-metal transition in Sr$_3$Ir$_2$O$_7$ studied by x-ray absorption spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Donnerer%2C+C">C. Donnerer</a>, <a href="/search/cond-mat?searchtype=author&query=Sala%2C+M+M">M. Moretti Sala</a>, <a href="/search/cond-mat?searchtype=author&query=Pascarelli%2C+S">S. Pascarelli</a>, <a href="/search/cond-mat?searchtype=author&query=Rosa%2C+A+D">A. D. Rosa</a>, <a href="/search/cond-mat?searchtype=author&query=Andreev%2C+S+N">S. N. Andreev</a>, <a href="/search/cond-mat?searchtype=author&query=Mazurenko%2C+V+V">V. V. Mazurenko</a>, <a href="/search/cond-mat?searchtype=author&query=Irifune%2C+T">T. Irifune</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1801.02234v1-abstract-short" style="display: inline;"> High-pressure x-ray absorption spectroscopy was performed at the Ir $L_3$ and $L_2$ absorption edges of Sr$_3$Ir$_2$O$_7$. The branching ratio of white line intensities continuously decreases with pressure, reflecting a reduction in the angular part of the expectation value of the spin-orbit coupling operator, $\left\langle {\bf L} \cdot {\bf S} \right\rangle$. Up to the high-pressure structural t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.02234v1-abstract-full').style.display = 'inline'; document.getElementById('1801.02234v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.02234v1-abstract-full" style="display: none;"> High-pressure x-ray absorption spectroscopy was performed at the Ir $L_3$ and $L_2$ absorption edges of Sr$_3$Ir$_2$O$_7$. The branching ratio of white line intensities continuously decreases with pressure, reflecting a reduction in the angular part of the expectation value of the spin-orbit coupling operator, $\left\langle {\bf L} \cdot {\bf S} \right\rangle$. Up to the high-pressure structural transition at 53 GPa, this behavior can be explained within a single-ion model, where pressure increases the strength of the cubic crystal field, which suppresses the spin-orbit induced hybridization of $J_{\text{eff}} = 3/2$ and $e_g$ levels. We observe a further reduction of the branching ratio above the structural transition, which cannot be explained within a single-ion model of spin-orbit coupling and cubic crystal fields. This change in $\left\langle {\bf L} \cdot {\bf S} \right\rangle$ in the high-pressure, metallic phase of Sr$_3$Ir$_2$O$_7$ could arise from non-cubic crystal fields or a bandwidth-driven hybridization of $J_{\text{eff}}=1/2,\,3/2$ states, and suggests that the electronic ground state significantly deviates from the $J_{\text{eff}}=1/2$ limit. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.02234v1-abstract-full').style.display = 'none'; document.getElementById('1801.02234v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 97, 035106 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.03791">arXiv:1711.03791</a> <span> [<a href="https://arxiv.org/pdf/1711.03791">pdf</a>, <a href="https://arxiv.org/format/1711.03791">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.96.184301">10.1103/PhysRevB.96.184301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transverse acoustic phonon anomalies at intermediate wavevectors in MgV$_{2}$O$_{4}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Weber%2C+T">T. Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Roessli%2C+B">B. Roessli</a>, <a href="/search/cond-mat?searchtype=author&query=Stock%2C+C">C. Stock</a>, <a href="/search/cond-mat?searchtype=author&query=Keller%2C+T">T. Keller</a>, <a href="/search/cond-mat?searchtype=author&query=Schmalzl%2C+K">K. Schmalzl</a>, <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">F. Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Georgii%2C+R">R. Georgii</a>, <a href="/search/cond-mat?searchtype=author&query=Ewings%2C+R+A">R. A. Ewings</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=B%C3%B6ni%2C+P">P. B枚ni</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.03791v1-abstract-short" style="display: inline;"> Magnetic spinels (with chemical formula $AX_{2}$O$_{4}$, with $X$ a 3$d$ transition metal ion) that also have an orbital degeneracy are Jahn-Teller active and hence possess a coupling between spin and lattice degrees of freedom. At high temperatures, MgV$_{2}$O$_{4}$ is a cubic spinel based on V$^{3+}$ ions with a spin $S$=1 and a triply degenerate orbital ground state. A structural transition occ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.03791v1-abstract-full').style.display = 'inline'; document.getElementById('1711.03791v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.03791v1-abstract-full" style="display: none;"> Magnetic spinels (with chemical formula $AX_{2}$O$_{4}$, with $X$ a 3$d$ transition metal ion) that also have an orbital degeneracy are Jahn-Teller active and hence possess a coupling between spin and lattice degrees of freedom. At high temperatures, MgV$_{2}$O$_{4}$ is a cubic spinel based on V$^{3+}$ ions with a spin $S$=1 and a triply degenerate orbital ground state. A structural transition occurs at T$_{OO}$=63 K to an orbitally ordered phase with a tetragonal unit cell followed by an antiferromagnetic transition of T$_{N}$=42 K on cooling. We apply neutron spectroscopy in single crystals of MgV$_{2}$O$_{4}$ to show an anomaly for intermediate wavevectors at T$_{OO}$ associated with the acoustic phonon sensitive to the shear elastic modulus $\left(C_{11}-C_{12}\right)/2$. On warming, the shear mode softens for momentum transfers near close to half the Brillouin zone boundary, but recovers near the zone centre. High resolution spin-echo measurements further illustrate a temporal broadening with increased temperature over this intermediate range of wavevectors, indicative of a reduction in phonon lifetime. A subtle shift in phonon frequencies over the same range of momentum transfers is observed with magnetic fields. We discuss this acoustic anomaly in context of coupling to orbital and charge fluctuations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.03791v1-abstract-full').style.display = 'none'; document.getElementById('1711.03791v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 96, 184301 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.04492">arXiv:1703.04492</a> <span> [<a href="https://arxiv.org/pdf/1703.04492">pdf</a>, <a href="https://arxiv.org/format/1703.04492">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.95.235141">10.1103/PhysRevB.95.235141 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Poor electronic screening in lightly doped Mott insulators observed with scanning tunneling microscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Battisti%2C+I">Irene Battisti</a>, <a href="/search/cond-mat?searchtype=author&query=Fedoseev%2C+V">Vitaliy Fedoseev</a>, <a href="/search/cond-mat?searchtype=author&query=Bastiaans%2C+K+M">Koen M. Bastiaans</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Torre%2C+A">Alberto de la Torre</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">Robin S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">Felix Baumberger</a>, <a href="/search/cond-mat?searchtype=author&query=Allan%2C+M+P">Milan P. Allan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1703.04492v2-abstract-short" style="display: inline;"> The effective Mott gap measured by scanning tunneling microscopy (STM) in the lightly doped Mott insulator $(\rm{Sr}_{1 -x}\rm{La}_x)_2\rm{IrO}_4$ differs greatly from values reported by photoemission and optical experiments. Here, we show that this is a consequence of the poor electronic screening of the tip-induced electric field in this material. Such effects are well known from STM experiments… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.04492v2-abstract-full').style.display = 'inline'; document.getElementById('1703.04492v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.04492v2-abstract-full" style="display: none;"> The effective Mott gap measured by scanning tunneling microscopy (STM) in the lightly doped Mott insulator $(\rm{Sr}_{1 -x}\rm{La}_x)_2\rm{IrO}_4$ differs greatly from values reported by photoemission and optical experiments. Here, we show that this is a consequence of the poor electronic screening of the tip-induced electric field in this material. Such effects are well known from STM experiments on semiconductors, and go under the name of tip-induced band bending (TIBB). We show that this phenomenon also exists in the lightly doped Mott insulator $(\rm{Sr}_{1 -x}\rm{La}_x)_2\rm{IrO}_4$ and that, at doping concentrations of $x\leq 4 \%$, it causes the measured energy gap in the sample density of states to be bigger than the one measured with other techniques. We develop a model able to retrieve the intrinsic energy gap leading to a value which is in rough agreement with other experiments, bridging the apparent contradiction. At doping $x \approx 5 \%$ we further observe circular features in the conductance layers that point to the emergence of a significant density of free carriers in this doping range, and to the presence of a small concentration of donor atoms. We illustrate the importance of considering the presence of TIBB when doing STM experiments on correlated-electron systems and discuss the similarities and differences between STM measurements on semiconductors and lightly doped Mott insulators. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.04492v2-abstract-full').style.display = 'none'; document.getElementById('1703.04492v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 95, 235141 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1605.00369">arXiv:1605.00369</a> <span> [<a href="https://arxiv.org/pdf/1605.00369">pdf</a>, <a href="https://arxiv.org/format/1605.00369">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.116.226402">10.1103/PhysRevLett.116.226402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multiple metamagnetic quantum criticality in Sr$_3$Ru$_2$O$_7$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Tokiwa%2C+Y">Y. Tokiwa</a>, <a href="/search/cond-mat?searchtype=author&query=Machalwat%2C+M">M. Machalwat</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Gegenwart%2C+P">P. Gegenwart</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1605.00369v1-abstract-short" style="display: inline;"> Bilayer strontium ruthenate Sr$_3$Ru$_2$O$_7$ displays pronounced non-Fermi liquid behavior at magnetic fields around 8 T, applied perpendicular to the ruthenate planes, which previously has been associated with an itinerant metamagnetic quantum critical end point (QCEP). We focus on the magnetic Gr眉neisen parameter $螕_{\rm H}$, which is the most direct probe to characterize field-induced quantum… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.00369v1-abstract-full').style.display = 'inline'; document.getElementById('1605.00369v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1605.00369v1-abstract-full" style="display: none;"> Bilayer strontium ruthenate Sr$_3$Ru$_2$O$_7$ displays pronounced non-Fermi liquid behavior at magnetic fields around 8 T, applied perpendicular to the ruthenate planes, which previously has been associated with an itinerant metamagnetic quantum critical end point (QCEP). We focus on the magnetic Gr眉neisen parameter $螕_{\rm H}$, which is the most direct probe to characterize field-induced quantum criticality. We confirm quantum critical scaling due to a putative two-dimensional QCEP near 7.845(5) T, which is masked by two ordered phases A and B, identified previously by neutron scattering. In addition we find evidence for a QCEP at 7.53(2) T and determine the quantum critical regimes of both instabilities and the effect of their superposition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.00369v1-abstract-full').style.display = 'none'; document.getElementById('1605.00369v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 116, 226402 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.08343">arXiv:1604.08343</a> <span> [<a href="https://arxiv.org/pdf/1604.08343">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/nphys3894">10.1038/nphys3894 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Universality of pseudogap and emergent order in lightly doped Mott insulators </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Battisti%2C+I">Irene Battisti</a>, <a href="/search/cond-mat?searchtype=author&query=Bastiaans%2C+K+M">Koen M. Bastiaans</a>, <a href="/search/cond-mat?searchtype=author&query=Fedoseev%2C+V">Vitaly Fedoseev</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Torre%2C+A">Alberto de la Torre</a>, <a href="/search/cond-mat?searchtype=author&query=Iliopoulos%2C+N">Nikolaos Iliopoulos</a>, <a href="/search/cond-mat?searchtype=author&query=Tamai%2C+A">Anna Tamai</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">Emily C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">Robin S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Zaanen%2C+J">Jan Zaanen</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">Felix Baumberger</a>, <a href="/search/cond-mat?searchtype=author&query=Allan%2C+M+P">Milan P. Allan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1604.08343v2-abstract-short" style="display: inline;"> It is widely believed that high-temperature superconductivity in the cuprates emerges from doped Mott insulators. The physics of the parent state seems deceivingly simple: The hopping of the electrons from site to site is prohibited because their on-site Coulomb repulsion U is larger than the kinetic energy gain t. When doping these materials by inserting a small percentage of extra carriers, the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.08343v2-abstract-full').style.display = 'inline'; document.getElementById('1604.08343v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.08343v2-abstract-full" style="display: none;"> It is widely believed that high-temperature superconductivity in the cuprates emerges from doped Mott insulators. The physics of the parent state seems deceivingly simple: The hopping of the electrons from site to site is prohibited because their on-site Coulomb repulsion U is larger than the kinetic energy gain t. When doping these materials by inserting a small percentage of extra carriers, the electrons become mobile but the strong correlations from the Mott state are thought to survive; inhomogeneous electronic order, a mysterious pseudogap and, eventually, superconductivity appear. How the insertion of dopant atoms drives this evolution is not known, nor whether these phenomena are mere distractions specific to hole-doped cuprates or represent the genuine physics of doped Mott insulators. Here, we visualize the evolution of the electronic states of (Sr1-xLax)2IrO4, which is an effective spin-1/2 Mott insulator like the cuprates, but is chemically radically different. Using spectroscopic-imaging STM, we find that for doping concentration of x=5%, an inhomogeneous, phase separated state emerges, with the nucleation of pseudogap puddles around clusters of dopant atoms. Within these puddles, we observe the same glassy electronic order that is so iconic for the underdoped cuprates. Further, we illuminate the genesis of this state using the unique possibility to localize dopant atoms on topographs in these samples. At low doping, we find evidence for much deeper trapping of carriers compared to the cuprates. This leads to fully gapped spectra with the chemical potential at mid-gap, which abruptly collapse at a threshold of around 4%. Our results clarify the melting of the Mott state, and establish phase separation and electronic order as generic features of doped Mott insulators. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.08343v2-abstract-full').style.display = 'none'; document.getElementById('1604.08343v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This version contains the supplementary information and small updates on figures and text</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Physics 13, 21 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1508.04320">arXiv:1508.04320</a> <span> [<a href="https://arxiv.org/pdf/1508.04320">pdf</a>, <a href="https://arxiv.org/format/1508.04320">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.93.174118">10.1103/PhysRevB.93.174118 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pressure dependence of the structure and electronic properties of Sr3Ir2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Donnerer%2C+C">C. Donnerer</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+Z">Z. Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Vale%2C+J+G">J. G. Vale</a>, <a href="/search/cond-mat?searchtype=author&query=Andreev%2C+S+N">S. N. Andreev</a>, <a href="/search/cond-mat?searchtype=author&query=Solovyev%2C+I+V">I. V. Solovyev</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Hanfland%2C+M">M. Hanfland</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=R%C3%B8nnow%2C+H+M">H. M. R酶nnow</a>, <a href="/search/cond-mat?searchtype=author&query=McMahon%2C+M+I">M. I. McMahon</a>, <a href="/search/cond-mat?searchtype=author&query=Mazurenko%2C+V+V">V. V. Mazurenko</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1508.04320v2-abstract-short" style="display: inline;"> We study the structural evolution of Sr$_3$Ir$_2$O$_7$ as a function of pressure using x-ray diffraction. At a pressure of 54 GPa at room temperature, we observe a first-order structural phase transition, associated with a change from tetragonal to monoclinic symmetry, and accompanied by a 4% volume collapse. Rietveld refinement of the high-pressure phase reveals a novel modification of the Ruddle… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.04320v2-abstract-full').style.display = 'inline'; document.getElementById('1508.04320v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1508.04320v2-abstract-full" style="display: none;"> We study the structural evolution of Sr$_3$Ir$_2$O$_7$ as a function of pressure using x-ray diffraction. At a pressure of 54 GPa at room temperature, we observe a first-order structural phase transition, associated with a change from tetragonal to monoclinic symmetry, and accompanied by a 4% volume collapse. Rietveld refinement of the high-pressure phase reveals a novel modification of the Ruddlesden-Popper structure, which adopts an altered stacking sequence of the perovskite bilayers. As the positions of the oxygen atoms could not be reliably refined from the data, we use density functional theory (local-density approximation+$U$+spin orbit) to optimize the crystal structure, and to elucidate the electronic and magnetic properties of Sr$_3$Ir$_2$O$_7$ at high pressure. In the low-pressure tetragonal phase, we find that the in-plane rotation of the IrO$_6$ octahedra increases with pressure. The calculations further indicate that a bandwidth-driven insulator-metal transition occurs at $\sim$20 GPa, along with a quenching of the magnetic moment. In the high-pressure monoclinic phase, structural optimization resulted in complex tilting and rotation of the oxygen octahedra, and strongly overlapping $t_{2g}$ and $e_g$ bands. The $t_{2g}$ bandwidth renders both the spin-orbit coupling and electronic correlations ineffectual in opening an electronic gap, resulting in a robust metallic state for the high-pressure phase of Sr$_3$Ir$_2$O$_7$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.04320v2-abstract-full').style.display = 'none'; document.getElementById('1508.04320v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 12 figures, accepted in PRB</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 93, 174118 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1506.07720">arXiv:1506.07720</a> <span> [<a href="https://arxiv.org/pdf/1506.07720">pdf</a>, <a href="https://arxiv.org/ps/1506.07720">ps</a>, <a href="https://arxiv.org/format/1506.07720">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.92.020406">10.1103/PhysRevB.92.020406 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The importance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Vale%2C+J+G">J. G. Vale</a>, <a href="/search/cond-mat?searchtype=author&query=Boseggia%2C+S">S. Boseggia</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+H+C">H. C. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Springell%2C+R">R. Springell</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+Z">Z. Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Prabhakaran%2C+D">D. Prabhakaran</a>, <a href="/search/cond-mat?searchtype=author&query=Boothroyd%2C+A+T">A. T. Boothroyd</a>, <a href="/search/cond-mat?searchtype=author&query=Collins%2C+S+P">S. P. Collins</a>, <a href="/search/cond-mat?searchtype=author&query=R%C3%B8nnow%2C+H+M">H. M. R酶nnow</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1506.07720v1-abstract-short" style="display: inline;"> The magnetic critical scattering in Sr$_2$IrO$_4$ has been characterized using X-ray resonant magnetic scattering (XRMS) both below and above the 3D antiferromagnetic ordering temperature, T$_{\text{N}}$. The order parameter critical exponent below T$_{\text{N}}$ is found to be 尾=0.195(4), in the range of the 2D XYh$_4$ universality class. Over an extended temperature range above T$_{\text{N}}$, t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.07720v1-abstract-full').style.display = 'inline'; document.getElementById('1506.07720v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1506.07720v1-abstract-full" style="display: none;"> The magnetic critical scattering in Sr$_2$IrO$_4$ has been characterized using X-ray resonant magnetic scattering (XRMS) both below and above the 3D antiferromagnetic ordering temperature, T$_{\text{N}}$. The order parameter critical exponent below T$_{\text{N}}$ is found to be 尾=0.195(4), in the range of the 2D XYh$_4$ universality class. Over an extended temperature range above T$_{\text{N}}$, the amplitude and correlation length of the intrinsic critical fluctuations are well described by the 2D Heisenberg model with XY anisotropy. This contrasts with an earlier study of the critical scattering over a more limited range of temperature which found agreement with the theory of the isotropic 2D Heisenberg quantum antiferromagnet, developed to describe the critical fluctuations of the conventional Mott insulator La$_2$CuO$_4$ and related systems. Our study therefore establishes the importance of XY anisotropy in the low-energy effective Hamiltonian of Sr$_2$IrO$_4$, the prototypical spin-orbit Mott insulator. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.07720v1-abstract-full').style.display = 'none'; document.getElementById('1506.07720v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 92, 020406(R), 2015 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1506.04877">arXiv:1506.04877</a> <span> [<a href="https://arxiv.org/pdf/1506.04877">pdf</a>, <a href="https://arxiv.org/ps/1506.04877">ps</a>, <a href="https://arxiv.org/format/1506.04877">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.92.024405">10.1103/PhysRevB.92.024405 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence of quantum dimer excitations in Sr$_3$Ir$_2$O$_7$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Sala%2C+M+M">M. Moretti Sala</a>, <a href="/search/cond-mat?searchtype=author&query=Schnells%2C+V">V. Schnells</a>, <a href="/search/cond-mat?searchtype=author&query=Boseggia%2C+S">S. Boseggia</a>, <a href="/search/cond-mat?searchtype=author&query=Simonelli%2C+L">L. Simonelli</a>, <a href="/search/cond-mat?searchtype=author&query=Al-Zein%2C+A">A. Al-Zein</a>, <a href="/search/cond-mat?searchtype=author&query=Vale%2C+J+G">J. G. Vale</a>, <a href="/search/cond-mat?searchtype=author&query=Paolasini%2C+L">L. Paolasini</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Prabhakaran%2C+D">D. Prabhakaran</a>, <a href="/search/cond-mat?searchtype=author&query=Boothroyd%2C+A+T">A. T. Boothroyd</a>, <a href="/search/cond-mat?searchtype=author&query=Krisch%2C+M">M. Krisch</a>, <a href="/search/cond-mat?searchtype=author&query=Monaco%2C+G">G. Monaco</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+H+M+R+D+F">H. M. Ronnow D. F. McMorrow</a>, <a href="/search/cond-mat?searchtype=author&query=Mila%2C+F">F. Mila</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1506.04877v1-abstract-short" style="display: inline;"> The magnetic excitation spectrum in the bilayer iridate Sr$_3$Ir$_2$O$_7$ has been investigated using high-resolution resonant inelastic x-ray scattering (RIXS) performed at the iridium L$_3$ edge and theoretical techniques. A study of the systematic dependence of the RIXS spectrum on the orientation of the wavevector transfer, $\mathbf{Q}$, with respect to the iridium-oxide bilayer has revealed t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.04877v1-abstract-full').style.display = 'inline'; document.getElementById('1506.04877v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1506.04877v1-abstract-full" style="display: none;"> The magnetic excitation spectrum in the bilayer iridate Sr$_3$Ir$_2$O$_7$ has been investigated using high-resolution resonant inelastic x-ray scattering (RIXS) performed at the iridium L$_3$ edge and theoretical techniques. A study of the systematic dependence of the RIXS spectrum on the orientation of the wavevector transfer, $\mathbf{Q}$, with respect to the iridium-oxide bilayer has revealed that the magnon dispersion is comprised of two branches well separated in energy and gapped across the entire Brillouin zone. Our results contrast with those of an earlier study which reported the existence of a single dominant branch. While these earlier results were interpreted as two overlapping modes within a spin-wave model of weakly coupled iridium-oxide planes, our results are more reminiscent of those expected for a system of weakly coupled dimers. In this latter approach the lower and higher energy modes find a natural explanation as those corresponding to transverse and longitudinal fluctuations, respectively. We have therefore developed a bond-operator theory which describes the magnetic dispersion in Sr$_3$Ir$_2$O$_7$ in terms of quantum dimer excitations. In our model dimerisation is produced by the leading Heisenberg exchange, $J_c$, which couples iridium ions in adjacent planes of the bilayer. The Hamiltonian also includes in plane exchange, $J$, as well as further neighbour couplings and relevant anisotropies. The bond-operator theory provides an excellent account of the dispersion of both modes, while the measured $\mathbf{Q}$ dependence of the RIXS intensities is in reasonable qualitative accord with the spin-spin correlation function calculated from the theory. We discuss our results in the context of the quantum criticality of bilayer dimer systems in the presence of anisotropic interactions derived from strong spin-orbit coupling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.04877v1-abstract-full').style.display = 'none'; document.getElementById('1506.04877v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 92, 024405 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1506.00616">arXiv:1506.00616</a> <span> [<a href="https://arxiv.org/pdf/1506.00616">pdf</a>, <a href="https://arxiv.org/format/1506.00616">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.115.176402">10.1103/PhysRevLett.115.176402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Collapse of the Mott gap and emergence of a nodal liquid in lightly doped Sr$_2$IrO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=de+la+Torre%2C+A">A. de la Torre</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+S+M">S. McKeown Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Bruno%2C+F+Y">F. Y. Bruno</a>, <a href="/search/cond-mat?searchtype=author&query=Ricco%2C+S">S. Ricco</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Z. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Lezama%2C+I+G">I. Gutierrez Lezama</a>, <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G">G. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Giriat%2C+G">G. Giriat</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Berthod%2C+C">C. Berthod</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+T+K">T. K. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Hoesch%2C+M">M. Hoesch</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Tamai%2C+A">A. Tamai</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">F. Baumberger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1506.00616v1-abstract-short" style="display: inline;"> Superconductivity in underdoped cuprates emerges from an unusual electronic state characterised by nodal quasiparticles and an antinodal pseudogap. The relation between this state and superconductivity is intensely studied but remains controversial. The discrimination between competing theoretical models is hindered by a lack of electronic structure data from related doped Mott insulators. Here we… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.00616v1-abstract-full').style.display = 'inline'; document.getElementById('1506.00616v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1506.00616v1-abstract-full" style="display: none;"> Superconductivity in underdoped cuprates emerges from an unusual electronic state characterised by nodal quasiparticles and an antinodal pseudogap. The relation between this state and superconductivity is intensely studied but remains controversial. The discrimination between competing theoretical models is hindered by a lack of electronic structure data from related doped Mott insulators. Here we report the doping evolution of the Heisenberg antiferromagnet Sr$_2$IrO$_4$, a close analogue to underdoped cuprates. We demonstrate that metallicity emerges from a rapid collapse of the Mott gap with doping, resulting in lens-like Fermi contours rather than disconnected Fermi arcs as observed in cuprates. Intriguingly though, the emerging electron liquid shows nodal quasiparticles with an antinodal pseudogap and thus bares strong similarities with underdoped cuprates. We conclude that anisotropic pseudogaps are a generic property of two-dimensional doped Mott insulators rather than a unique hallmark of cuprate high-temperature superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.00616v1-abstract-full').style.display = 'none'; document.getElementById('1506.00616v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 115, 176402 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1410.8792">arXiv:1410.8792</a> <span> [<a href="https://arxiv.org/pdf/1410.8792">pdf</a>, <a href="https://arxiv.org/format/1410.8792">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.91.075129">10.1103/PhysRevB.91.075129 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Thermal conductivity across the metal-insulator transition in single crystalline hyperkagome Na$_{3+x}$Ir$_3$O$_8$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fauqu%C3%A9%2C+B">B. Fauqu茅</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+X">Xiaofeng Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Bangura%2C+A+F">A. F. Bangura</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Yamamoto%2C+A">A. Yamamoto</a>, <a href="/search/cond-mat?searchtype=author&query=Behnia%2C+K">K. Behnia</a>, <a href="/search/cond-mat?searchtype=author&query=Carrington%2C+A">A. Carrington</a>, <a href="/search/cond-mat?searchtype=author&query=Takagi%2C+H">H. Takagi</a>, <a href="/search/cond-mat?searchtype=author&query=Hussey%2C+N+E">N. E. Hussey</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1410.8792v1-abstract-short" style="display: inline;"> The hyperkagome antiferromagnet Na$_{4}$Ir$_3$O$_8$ represents the first genuine candidate for the realisation of a three-dimensional quantum spin-liquid. It can also be doped towards a metallic state, thus offering a rare opportunity to explore the nature of the metal-insulator transition in correlated, frustrated magnets. Here we report thermodynamic and transport measurements in both metallic a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.8792v1-abstract-full').style.display = 'inline'; document.getElementById('1410.8792v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1410.8792v1-abstract-full" style="display: none;"> The hyperkagome antiferromagnet Na$_{4}$Ir$_3$O$_8$ represents the first genuine candidate for the realisation of a three-dimensional quantum spin-liquid. It can also be doped towards a metallic state, thus offering a rare opportunity to explore the nature of the metal-insulator transition in correlated, frustrated magnets. Here we report thermodynamic and transport measurements in both metallic and weakly insulating single crystals down to 150 mK. While in the metallic sample the phonon thermal conductivity ($魏^{ph}$) is almost in the boundary scattering regime, in the insulating sample we find a large reduction $魏^{ph}$ over a very wide temperature range. This result can be ascribed to the scattering of phonons off nanoscale disorder or off the gapless magnetic excitations that are seen in the low-temperature specific heat. This works highlights the peculiarity of the metal-insulator transition in Na$_{3+x}$Ir$_3$O$_8$ and demonstrates the importance of the coupling between lattice and spin degrees of freedom in the presence of strong spin-orbit coupling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.8792v1-abstract-full').style.display = 'none'; document.getElementById('1410.8792v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 October, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.7054">arXiv:1409.7054</a> <span> [<a href="https://arxiv.org/pdf/1409.7054">pdf</a>, <a href="https://arxiv.org/ps/1409.7054">ps</a>, <a href="https://arxiv.org/format/1409.7054">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/nmat4181">10.1038/nmat4181 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Field tunable spin density wave phases in Sr3Ru2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lester%2C+C">C. Lester</a>, <a href="/search/cond-mat?searchtype=author&query=Ramos%2C+S">S. Ramos</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Croft%2C+T+P">T. P. Croft</a>, <a href="/search/cond-mat?searchtype=author&query=Bewley%2C+R+I">R. I. Bewley</a>, <a href="/search/cond-mat?searchtype=author&query=Guidi%2C+T">T. Guidi</a>, <a href="/search/cond-mat?searchtype=author&query=Manuel%2C+P">P. Manuel</a>, <a href="/search/cond-mat?searchtype=author&query=Khalyavin%2C+D+D">D. D. Khalyavin</a>, <a href="/search/cond-mat?searchtype=author&query=Forgan%2C+E+M">E. M. Forgan</a>, <a href="/search/cond-mat?searchtype=author&query=Hayden%2C+S+M">S. M. Hayden</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1409.7054v2-abstract-short" style="display: inline;"> The conduction electrons in a metal experience competing interactions with each other and the atomic nuclei. This competition can lead to many types of magnetic order in metals. For example, in chromium the electrons order to form a spin-density-wave (SDW) antiferromagnetic state. A magnetic field may be used to perturb or tune materials with delicately balanced electronic interactions. Here we sh… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.7054v2-abstract-full').style.display = 'inline'; document.getElementById('1409.7054v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.7054v2-abstract-full" style="display: none;"> The conduction electrons in a metal experience competing interactions with each other and the atomic nuclei. This competition can lead to many types of magnetic order in metals. For example, in chromium the electrons order to form a spin-density-wave (SDW) antiferromagnetic state. A magnetic field may be used to perturb or tune materials with delicately balanced electronic interactions. Here we show that the application of a magnetic field can induce SDW magnetic order in a metal, where none exists in the absence of the field. We use magnetic neutron scattering to show that the application of a large (~8T) magnetic field to the metamagnetic perovskite metal Sr3Ru2O7 can be used to tune the material through two magnetically-ordered SDW states. The ordered states exist over relatively small ranges in field (<0.4T) suggesting that their origin is due to a new mechanism related to the electronic fine structure near the Fermi energy, possibly combined with the stabilising effect of magnetic fluctuations. The magnetic field direction is shown to control the SDW domain populations which naturally explains the strong resistivity anisotropy or electronic nematic behaviour observed in this material. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.7054v2-abstract-full').style.display = 'none'; document.getElementById('1409.7054v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 November, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Legend in Fig. 3(b) corrected</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Materials, nmat4181 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1405.6522">arXiv:1405.6522</a> <span> [<a href="https://arxiv.org/pdf/1405.6522">pdf</a>, <a href="https://arxiv.org/ps/1405.6522">ps</a>, <a href="https://arxiv.org/format/1405.6522">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.90.085126">10.1103/PhysRevB.90.085126 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Crystal field splitting in Sr$_{n+1}$Ir$_n$O$_{3n+1}$ ($n$ = 1, 2) iridates probed by x-ray Raman spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Sala%2C+M+M">M. Moretti Sala</a>, <a href="/search/cond-mat?searchtype=author&query=Rossi%2C+M">M. Rossi</a>, <a href="/search/cond-mat?searchtype=author&query=Al-Zein%2C+A">A. Al-Zein</a>, <a href="/search/cond-mat?searchtype=author&query=Boseggia%2C+S">S. Boseggia</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Prabhakaran%2C+D">D. Prabhakaran</a>, <a href="/search/cond-mat?searchtype=author&query=Boothroyd%2C+A+T">A. T. Boothroyd</a>, <a href="/search/cond-mat?searchtype=author&query=Brookes%2C+N+B">N. B. Brookes</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a>, <a href="/search/cond-mat?searchtype=author&query=Monaco%2C+G">G. Monaco</a>, <a href="/search/cond-mat?searchtype=author&query=Krisch%2C+M">M. Krisch</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1405.6522v1-abstract-short" style="display: inline;"> Non-resonant Raman spectroscopy in the hard X-ray regime has been used to explore the electronic structure of the first two members of the Ruddlesden-Popper series Sr$_{n+1}$Ir$_n$O$_{3n+1}$ of iridates. By tuning the photon energy transfer around 530 eV we have been able to explore the oxygen K near edge structure with bulk sensitivity. The angular dependence of the spectra has been exploited to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.6522v1-abstract-full').style.display = 'inline'; document.getElementById('1405.6522v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1405.6522v1-abstract-full" style="display: none;"> Non-resonant Raman spectroscopy in the hard X-ray regime has been used to explore the electronic structure of the first two members of the Ruddlesden-Popper series Sr$_{n+1}$Ir$_n$O$_{3n+1}$ of iridates. By tuning the photon energy transfer around 530 eV we have been able to explore the oxygen K near edge structure with bulk sensitivity. The angular dependence of the spectra has been exploited to assign features in the 528-535 eV energy range to specific transitions involving the Ir 5d orbitals. This has allowed us to extract reliable values for both the t2g-eg splitting arising from the cubic component of the crystal field (10Dq), in addition to the splitting of the eg orbitals due to tetragonal distortions. The values we obtain are (3.8, 1.6) eV and (3.55, 1.9) eV for Sr$_2$IrO$_4$ and Sr$_3$Ir$_2$O$_7$, respectively. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.6522v1-abstract-full').style.display = 'none'; document.getElementById('1405.6522v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 90, 085126 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1405.2284">arXiv:1405.2284</a> <span> [<a href="https://arxiv.org/pdf/1405.2284">pdf</a>, <a href="https://arxiv.org/format/1405.2284">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.113.047202">10.1103/PhysRevLett.113.047202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin wave spectrum of the quantum ferromagnet on the pyrochlore lattice Lu2V2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mena%2C+M">M. Mena</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Perring%2C+T+G">T. G. Perring</a>, <a href="/search/cond-mat?searchtype=author&query=Le%2C+M+D">M. D. Le</a>, <a href="/search/cond-mat?searchtype=author&query=Guerrero%2C+S">S. Guerrero</a>, <a href="/search/cond-mat?searchtype=author&query=Storni%2C+M">M. Storni</a>, <a href="/search/cond-mat?searchtype=author&query=Adroja%2C+D+T">D. T. Adroja</a>, <a href="/search/cond-mat?searchtype=author&query=Ruegg%2C+C">Ch. Ruegg</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1405.2284v1-abstract-short" style="display: inline;"> Neutron inelastic scattering has been used to probe the spin dynamics of the quantum (S=1/2) ferromagnet on the pyrochlore lattice Lu2V2O7. Well-defined spin waves are observed at all energies and wavevectors, allowing us to determine the parameters of the Hamiltonian of the system. The data are found to be in excellent overall agreement with a minimal model that includes a nearest- neighbour Heis… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.2284v1-abstract-full').style.display = 'inline'; document.getElementById('1405.2284v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1405.2284v1-abstract-full" style="display: none;"> Neutron inelastic scattering has been used to probe the spin dynamics of the quantum (S=1/2) ferromagnet on the pyrochlore lattice Lu2V2O7. Well-defined spin waves are observed at all energies and wavevectors, allowing us to determine the parameters of the Hamiltonian of the system. The data are found to be in excellent overall agreement with a minimal model that includes a nearest- neighbour Heisenberg exchange J = 8:22(2) meV and a Dzyaloshinskii-Moriya interaction (DMI) D =1:5(1) meV. The large DMI term revealed by our study is broadly consistent with the model developed by Onose et al. to explain the magnon Hall effect they observed in Lu2V2O7 [1], although our ratio of D=J = 0:18(1) is roughly half of their value and three times larger than calculated by ab initio methods [2]. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.2284v1-abstract-full').style.display = 'none'; document.getElementById('1405.2284v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1308.5707">arXiv:1308.5707</a> <span> [<a href="https://arxiv.org/pdf/1308.5707">pdf</a>, <a href="https://arxiv.org/ps/1308.5707">ps</a>, <a href="https://arxiv.org/format/1308.5707">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.88.235129">10.1103/PhysRevB.88.235129 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pressure study of nematicity and quantum criticality in Sr$_3$Ru$_2$O$_7$ for an in-plane field </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Sun%2C+D">Dan Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+W">W. Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Grigera%2C+S+A">S. A. Grigera</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a>, <a href="/search/cond-mat?searchtype=author&query=Julian%2C+S+R">S. R. Julian</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1308.5707v2-abstract-short" style="display: inline;"> We study the relationship between the nematic phases of Sr$_3$Ru$_2$O$_7$ and quantum criticality. At ambient pressure, one nematic phase is associated with a metamagnetic quantum critical end point (QCEP) when the applied magnetic field is near the \textit{c}-axis. We show, however, that this metamagnetic transition does not produce the same nematic signatures when the QCEP is reached by hydrosta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.5707v2-abstract-full').style.display = 'inline'; document.getElementById('1308.5707v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1308.5707v2-abstract-full" style="display: none;"> We study the relationship between the nematic phases of Sr$_3$Ru$_2$O$_7$ and quantum criticality. At ambient pressure, one nematic phase is associated with a metamagnetic quantum critical end point (QCEP) when the applied magnetic field is near the \textit{c}-axis. We show, however, that this metamagnetic transition does not produce the same nematic signatures when the QCEP is reached by hydrostatic pressure with the field applied in the \textit{ab}-plane. Moreover, a second nematic phase, that is seen for field applied in the \textit{ab}-plane close to, but not right at, a second metamagnetic anomaly, persists with minimal change to the highest applied pressure, 16.55 kbar. Taken together our results suggest that metamagnetic quantum criticality may not be necessary for the formation of a nematic phase in Sr$_3$Ru$_2$O$_7$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.5707v2-abstract-full').style.display = 'none'; document.getElementById('1308.5707v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 January, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 August, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 88, 235129 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1303.6459">arXiv:1303.6459</a> <span> [<a href="https://arxiv.org/pdf/1303.6459">pdf</a>, <a href="https://arxiv.org/ps/1303.6459">ps</a>, <a href="https://arxiv.org/format/1303.6459">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.87.161106">10.1103/PhysRevB.87.161106 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of the electronic nematic phase of Sr$_3$Ru$_2$O$_7$ with precise control of the applied magnetic field vector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bruin%2C+J+A+N">J. A. N. Bruin</a>, <a href="/search/cond-mat?searchtype=author&query=Borzi%2C+R+A">R. A. Borzi</a>, <a href="/search/cond-mat?searchtype=author&query=Grigera%2C+S+A">S. A. Grigera</a>, <a href="/search/cond-mat?searchtype=author&query=Rost%2C+A+W">A. W. Rost</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1303.6459v1-abstract-short" style="display: inline;"> We report a study of the magnetoresistivity of high purity Sr$_3$Ru$_2$O$_7$, in the vicinity of its electronic nematic phase. By employing a triple-axis (9/1/1T) vector magnet, we were able to precisely tune both the magnitude and direction of the in-plane component of the magnetic field (H$_\parallel$). We report the dependence of the resistively determined anisotropy on H$_\parallel$ in the pha… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.6459v1-abstract-full').style.display = 'inline'; document.getElementById('1303.6459v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1303.6459v1-abstract-full" style="display: none;"> We report a study of the magnetoresistivity of high purity Sr$_3$Ru$_2$O$_7$, in the vicinity of its electronic nematic phase. By employing a triple-axis (9/1/1T) vector magnet, we were able to precisely tune both the magnitude and direction of the in-plane component of the magnetic field (H$_\parallel$). We report the dependence of the resistively determined anisotropy on H$_\parallel$ in the phase, as well as across the wider temperature-field region. Our measurements reveal a high-temperature anisotropy which mimics the behaviour of fluctuations from the underlying quantum critical point, and suggest the existence of a more complicated phase diagram than previously reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.6459v1-abstract-full').style.display = 'none'; document.getElementById('1303.6459v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 March, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1212.5912">arXiv:1212.5912</a> <span> [<a href="https://arxiv.org/pdf/1212.5912">pdf</a>, <a href="https://arxiv.org/ps/1212.5912">ps</a>, <a href="https://arxiv.org/format/1212.5912">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.110.117207">10.1103/PhysRevLett.110.117207 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Robustness of basal-plane antiferromagnetic order and the $J_{eff}=1/2$ state in single-layer iridate spin-orbit Mott insulators </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Boseggia%2C+S">S. Boseggia</a>, <a href="/search/cond-mat?searchtype=author&query=Springell%2C+R">R. Springell</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+H+C">H. C. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=R%C3%BCegg%2C+C">Ch. R眉egg</a>, <a href="/search/cond-mat?searchtype=author&query=Okabe%2C+H">H. Okabe</a>, <a href="/search/cond-mat?searchtype=author&query=Isobe%2C+M">M. Isobe</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Collins%2C+S+P">S. P. Collins</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1212.5912v1-abstract-short" style="display: inline;"> The magnetic structure and electronic groundstate of the layered perovskite Ba2IrO4 have been investigated using x-ray resonant magnetic scattering (XRMS). Our results are compared with those for Sr2IrO4, for which we provide supplementary data on its magnetic structure. We find that the dominant, long-range antiferromagnetic order is remarkably similar in the two compounds, and that the electroni… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.5912v1-abstract-full').style.display = 'inline'; document.getElementById('1212.5912v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1212.5912v1-abstract-full" style="display: none;"> The magnetic structure and electronic groundstate of the layered perovskite Ba2IrO4 have been investigated using x-ray resonant magnetic scattering (XRMS). Our results are compared with those for Sr2IrO4, for which we provide supplementary data on its magnetic structure. We find that the dominant, long-range antiferromagnetic order is remarkably similar in the two compounds, and that the electronic groundstate in Ba2IrO4, deduced from an investigation of the XRMS $L_3/L_2$ intensity ratio, is consistent with a $J_{eff}=1/2$ description. The robustness of these two key electronic properties to the considerable structural differences between the Ba and Sr analogues is discussed in terms of the enhanced role of the spin-orbit interaction in 5d transition metal oxides. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.5912v1-abstract-full').style.display = 'none'; document.getElementById('1212.5912v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 December, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 110, 117207 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1212.0948">arXiv:1212.0948</a> <span> [<a href="https://arxiv.org/pdf/1212.0948">pdf</a>, <a href="https://arxiv.org/format/1212.0948">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/pssb.201200905">10.1002/pssb.201200905 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electronic nematicity and its relation to quantum criticality in Sr_3Ru_2O_7 studied by thermal expansion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stingl%2C+C">C. Stingl</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Maeno%2C+Y">Y. Maeno</a>, <a href="/search/cond-mat?searchtype=author&query=Gegenwart%2C+P">P. Gegenwart</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1212.0948v1-abstract-short" style="display: inline;"> We report high-resolution measurements of the in-plane thermal expansion anisotropy in the vicinity of the electronic nematic phase in Sr$_3$Ru$_2$O$_7$ down to very low temperatures and in varying magnetic field orientation. For fields applied along the c-direction, a clear second-order phase transition is found at the nematic phase, with critical behavior compatible with the two-dimensional Isin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.0948v1-abstract-full').style.display = 'inline'; document.getElementById('1212.0948v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1212.0948v1-abstract-full" style="display: none;"> We report high-resolution measurements of the in-plane thermal expansion anisotropy in the vicinity of the electronic nematic phase in Sr$_3$Ru$_2$O$_7$ down to very low temperatures and in varying magnetic field orientation. For fields applied along the c-direction, a clear second-order phase transition is found at the nematic phase, with critical behavior compatible with the two-dimensional Ising universality class (although this is not fully conclusive). Measurements in a slightly tilted magnetic field reveal a broken four-fold in-plane rotational symmetry, not only within the nematic phase, but extending towards slightly larger fields. We also analyze the universal scaling behavior expected for a metamagnetic quantum critical point, which is realized outside the nematic region. The contours of the magnetostriction suggest a relation between quantum criticality and the nematic phase. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.0948v1-abstract-full').style.display = 'none'; document.getElementById('1212.0948v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 December, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 12 Figures, invited paper at QCNP 2012 conference</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Status Solidi B 250 (2013) 450 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1210.8382">arXiv:1210.8382</a> <span> [<a href="https://arxiv.org/pdf/1210.8382">pdf</a>, <a href="https://arxiv.org/format/1210.8382">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/15/6/063029">10.1088/1367-2630/15/6/063029 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Formation and consequences of heavy d-electron quasiparticles in Sr3Ru2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Allan%2C+M+P">M. P. Allan</a>, <a href="/search/cond-mat?searchtype=author&query=Tamai%2C+A">A. Tamai</a>, <a href="/search/cond-mat?searchtype=author&query=Rozbicki%2C+E">E. Rozbicki</a>, <a href="/search/cond-mat?searchtype=author&query=Fischer%2C+M+H">M. H. Fischer</a>, <a href="/search/cond-mat?searchtype=author&query=Voss%2C+J">J. Voss</a>, <a href="/search/cond-mat?searchtype=author&query=King%2C+P+D+C">P. D. C. King</a>, <a href="/search/cond-mat?searchtype=author&query=Meevasana%2C+W">W. Meevasana</a>, <a href="/search/cond-mat?searchtype=author&query=Thirupathaiah%2C+S">S. Thirupathaiah</a>, <a href="/search/cond-mat?searchtype=author&query=Rienks%2C+E">E. Rienks</a>, <a href="/search/cond-mat?searchtype=author&query=Fink%2C+J">J. Fink</a>, <a href="/search/cond-mat?searchtype=author&query=Tennant%2C+A">A. Tennant</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Mercure%2C+J+F">J. F. Mercure</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M+A">M. A. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Fennie%2C+C+J">C. J. Fennie</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+E+-">E. -A. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Lawler%2C+M+J">M. J. Lawler</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+K+M">K. M. Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Z+-">Z. -X. Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">F. Baumberger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1210.8382v1-abstract-short" style="display: inline;"> We report angle-resolved photoelectron spectroscopy measurements of the quantum critical metal Sr3Ru2O7 revealing itinerant Ru 4d-states confined over large parts of the Brillouin zone to an energy range of < 6 meV, nearly three orders of magnitude lower than the bare band width. We show that this energy scale agrees quantitatively with a characteristic thermodynamic energy scale associated with q… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.8382v1-abstract-full').style.display = 'inline'; document.getElementById('1210.8382v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1210.8382v1-abstract-full" style="display: none;"> We report angle-resolved photoelectron spectroscopy measurements of the quantum critical metal Sr3Ru2O7 revealing itinerant Ru 4d-states confined over large parts of the Brillouin zone to an energy range of < 6 meV, nearly three orders of magnitude lower than the bare band width. We show that this energy scale agrees quantitatively with a characteristic thermodynamic energy scale associated with quantum criticality and illustrate how it arises from the hybridization of light and strongly renormalized, heavy quasiparticle bands. For the largest Fermi surface sheet we find a marked k-dependence of the renormalization and show that it correlates with the Ru 4d - O 2p hybridization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.8382v1-abstract-full').style.display = 'none'; document.getElementById('1210.8382v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 15 (2013) 063029 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1108.3554">arXiv:1108.3554</a> <span> [<a href="https://arxiv.org/pdf/1108.3554">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1073/pnas.1112775108">10.1073/pnas.1112775108 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Sr3Ru2O7: Thermodynamics of Phase Formation in a Quantum Critical Metal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Rost%2C+A+W">A. W. Rost</a>, <a href="/search/cond-mat?searchtype=author&query=Grigera%2C+S+A">S. A. Grigera</a>, <a href="/search/cond-mat?searchtype=author&query=Bruin%2C+J+A+N">J. A. N. Bruin</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Tian%2C+D">D. Tian</a>, <a href="/search/cond-mat?searchtype=author&query=Raghu%2C+S">S. Raghu</a>, <a href="/search/cond-mat?searchtype=author&query=Kivelson%2C+S+A">S. A. Kivelson</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1108.3554v2-abstract-short" style="display: inline;"> The behaviour of matter near zero temperature continuous phase transitions, or 'quantum critical points' (QCPs) is a central topic of study in condensed matter physics. In fermionic systems, fundamental questions remain unanswered: the nature of the quantum critical regime is unclear because of the apparent breakdown of the concept of the quasiparticle, a cornerstone of existing theories of strong… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1108.3554v2-abstract-full').style.display = 'inline'; document.getElementById('1108.3554v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1108.3554v2-abstract-full" style="display: none;"> The behaviour of matter near zero temperature continuous phase transitions, or 'quantum critical points' (QCPs) is a central topic of study in condensed matter physics. In fermionic systems, fundamental questions remain unanswered: the nature of the quantum critical regime is unclear because of the apparent breakdown of the concept of the quasiparticle, a cornerstone of existing theories of strongly interacting metals. Even less is known experimentally about the formation of ordered phases from such a quantum critical 'soup'. Here, we report a study of the specific heat across the phase diagram of the model system Sr3Ru2O7, which features an anomalous phase whose transport properties are consistent with those of an electronic nematic. We show that this phase, which exists at low temperatures in a narrow range of magnetic fields, forms directly from a quantum critical state, and contains more entropy than mean-field calculations predict. Our results suggest that this extra entropy is due to remnant degrees of freedom from the highly entropic state above T_c. The associated quantum critical point, which is 'concealed' by the nematic phase, separates two Fermi liquids, neither of which has an identifiable spontaneously broken symmetry, but which likely differ in the topology of their Fermi surfaces. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1108.3554v2-abstract-full').style.display = 'none'; document.getElementById('1108.3554v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 August, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Corrected version after acceptance for publication (minor text corrections and typo axis labeling of Fig. 3B). Journal reference added</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PNAS October 4, 2011 vol. 108 no. 40 pp. 16549-16553 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1101.1125">arXiv:1101.1125</a> <span> [<a href="https://arxiv.org/pdf/1101.1125">pdf</a>, <a href="https://arxiv.org/ps/1101.1125">ps</a>, <a href="https://arxiv.org/format/1101.1125">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.83.045106">10.1103/PhysRevB.83.045106 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum critical metamagnetism of Sr3Ru2O7 under hydrostatic pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wu%2C+W">W. Wu</a>, <a href="/search/cond-mat?searchtype=author&query=McCollam%2C+A">A. McCollam</a>, <a href="/search/cond-mat?searchtype=author&query=Grigera%2C+S+A">S. A. Grigera</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a>, <a href="/search/cond-mat?searchtype=author&query=Julian%2C+S+R">S. R. Julian</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1101.1125v1-abstract-short" style="display: inline;"> Using ac susceptibility, we have determined the pressure dependence of the metamagnetic critical end point temperature T* for field applied in the ab-plane in the itinerant metamagnet Sr3Ru2O7. We find that T* falls monotonically to zero as pressure increases, producing a quantum critical end point (QCEP) at Pc~13.6 kbar. New features are observed near the QCEP -- the slope of T* vs pressure chang… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1101.1125v1-abstract-full').style.display = 'inline'; document.getElementById('1101.1125v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1101.1125v1-abstract-full" style="display: none;"> Using ac susceptibility, we have determined the pressure dependence of the metamagnetic critical end point temperature T* for field applied in the ab-plane in the itinerant metamagnet Sr3Ru2O7. We find that T* falls monotonically to zero as pressure increases, producing a quantum critical end point (QCEP) at Pc~13.6 kbar. New features are observed near the QCEP -- the slope of T* vs pressure changes at ~12.8 kbar, and weak subsidiary maxima appear on either side of the main susceptibility peak at pressures near Pc -- indicating that some new physics comes into play near the QCEP. Clear signatures of a nematic phase, however, that were seen in field-angle tuning of T*, are not observed. As T* is suppressed by pressure, the metamagnetic peak in the susceptibility remains sharp as a function of applied magnetic field. As a function of temperature, however, the peak becomes broad with only a very weak maximum, suggesting that, near the QCEP, the uniform magnetization density is not the order parameter for the metamagnetic transition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1101.1125v1-abstract-full').style.display = 'none'; document.getElementById('1101.1125v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 January, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2011. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1012.4672">arXiv:1012.4672</a> <span> [<a href="https://arxiv.org/pdf/1012.4672">pdf</a>, <a href="https://arxiv.org/ps/1012.4672">ps</a>, <a href="https://arxiv.org/format/1012.4672">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.107.026404">10.1103/PhysRevLett.107.026404 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Symmetry-breaking lattice distortion in Sr_3Ru_2O_7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stingl%2C+C">C. Stingl</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Maeno%2C+Y">Y. Maeno</a>, <a href="/search/cond-mat?searchtype=author&query=Gegenwart%2C+P">P. Gegenwart</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1012.4672v3-abstract-short" style="display: inline;"> The electronic nematic phase of Sr$_3$Ru$_2$O$_7$ is investigated by high-resolution in-plane thermal expansion measurements in magnetic fields close to 8 T applied at various angles $螛$ off the c-axis. At $螛<10^\circ$ we observe a very small ($10^{-7}$) lattice distortion which breaks the four-fold in-plane symmetry, resulting in nematic domains with interchanged $a$- and b-axis. At… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1012.4672v3-abstract-full').style.display = 'inline'; document.getElementById('1012.4672v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1012.4672v3-abstract-full" style="display: none;"> The electronic nematic phase of Sr$_3$Ru$_2$O$_7$ is investigated by high-resolution in-plane thermal expansion measurements in magnetic fields close to 8 T applied at various angles $螛$ off the c-axis. At $螛<10^\circ$ we observe a very small ($10^{-7}$) lattice distortion which breaks the four-fold in-plane symmetry, resulting in nematic domains with interchanged $a$- and b-axis. At $螛\gtrsim 10^\circ$ the domains are almost fully aligned and thermal expansion indicates an area-preserving lattice distortion of order $2\times 10^{-6}$ which is likely related to orbital ordering. Since the system is located in the immediate vicinity to a metamagnetic quantum critical end point, the results represent the first observation of a structural relaxation driven by quantum criticality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1012.4672v3-abstract-full').style.display = 'none'; document.getElementById('1012.4672v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 December, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 5 figures, PRL accepted</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 107 (2011) 026404 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1011.1174">arXiv:1011.1174</a> <span> [<a href="https://arxiv.org/pdf/1011.1174">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/science.1178868">10.1126/science.1178868 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dirac Strings and Magnetic Monopoles in Spin Ice Dy2Ti2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Morris%2C+D+J+P">D. J. P. Morris</a>, <a href="/search/cond-mat?searchtype=author&query=Tennant%2C+D+A">D. A. Tennant</a>, <a href="/search/cond-mat?searchtype=author&query=Grigera%2C+S+A">S. A. Grigera</a>, <a href="/search/cond-mat?searchtype=author&query=Klemke%2C+B">B. Klemke</a>, <a href="/search/cond-mat?searchtype=author&query=Castelnovo%2C+C">C. Castelnovo</a>, <a href="/search/cond-mat?searchtype=author&query=Moessner%2C+R">R. Moessner</a>, <a href="/search/cond-mat?searchtype=author&query=Czternasty%2C+C">C. Czternasty</a>, <a href="/search/cond-mat?searchtype=author&query=Meissner%2C+M">M. Meissner</a>, <a href="/search/cond-mat?searchtype=author&query=Rule%2C+K+C">K. C. Rule</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffmann%2C+J+-">J. -U. Hoffmann</a>, <a href="/search/cond-mat?searchtype=author&query=Kiefer%2C+K">K. Kiefer</a>, <a href="/search/cond-mat?searchtype=author&query=Gerischer%2C+S">S. Gerischer</a>, <a href="/search/cond-mat?searchtype=author&query=Slobinsky%2C+D">D. Slobinsky</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1011.1174v1-abstract-short" style="display: inline;"> While sources of magnetic fields - magnetic monopoles - have so far proven elusive as elementary particles, several scenarios have been proposed recently in condensed matter physics of emergent quasiparticles resembling monopoles. A particularly simple proposition pertains to spin ice on the highly frustrated pyrochlore lattice. The spin ice state is argued to be well-described by networks of alig… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1011.1174v1-abstract-full').style.display = 'inline'; document.getElementById('1011.1174v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1011.1174v1-abstract-full" style="display: none;"> While sources of magnetic fields - magnetic monopoles - have so far proven elusive as elementary particles, several scenarios have been proposed recently in condensed matter physics of emergent quasiparticles resembling monopoles. A particularly simple proposition pertains to spin ice on the highly frustrated pyrochlore lattice. The spin ice state is argued to be well-described by networks of aligned dipoles resembling solenoidal tubes - classical, and observable, versions of a Dirac string. Where these tubes end, the resulting defect looks like a magnetic monopole. We demonstrate, by diffuse neutron scattering, the presence of such strings in the spin-ice Dy2Ti2O7. This is achieved by applying a symmetry-breaking magnetic field with which we can manipulate density and orientation of the strings. In turn, heat capacity is described by a gas of magnetic monopoles interacting via a magnetic Coulomb interaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1011.1174v1-abstract-full').style.display = 'none'; document.getElementById('1011.1174v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 November, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">32 pages (19 pages of article, 13 pages of supporting online material)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science 326, 411-414 (2009) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0909.2731">arXiv:0909.2731</a> <span> [<a href="https://arxiv.org/pdf/0909.2731">pdf</a>, <a href="https://arxiv.org/format/0909.2731">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/pssb.200983034">10.1002/pssb.200983034 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anisotropy of the low-temperature magnetostriction of Sr3Ru2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stingl%2C+C">C. Stingl</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Maeno%2C+Y">Y. Maeno</a>, <a href="/search/cond-mat?searchtype=author&query=Gegenwart%2C+P">P. Gegenwart</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0909.2731v1-abstract-short" style="display: inline;"> We use high-resolution capacitive dilatometry to study the low-temperature linear magnetostriction of the bilayer ruthenate Sr$_3$Ru$_2$O$_7$ as a function of magnetic field applied perpendicular to the ruthenium-oxide planes ($B\parallel c$). The relative length change $螖L(B)/L$ is detected either parallel or perpendicular to the c-axis close to the metamagnetic region near B=8 T. In both cases… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.2731v1-abstract-full').style.display = 'inline'; document.getElementById('0909.2731v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0909.2731v1-abstract-full" style="display: none;"> We use high-resolution capacitive dilatometry to study the low-temperature linear magnetostriction of the bilayer ruthenate Sr$_3$Ru$_2$O$_7$ as a function of magnetic field applied perpendicular to the ruthenium-oxide planes ($B\parallel c$). The relative length change $螖L(B)/L$ is detected either parallel or perpendicular to the c-axis close to the metamagnetic region near B=8 T. In both cases, clear peaks in the coefficient $位(B)=d(螖L/L)/dB$ at three subsequent metamagnetic transitions are observed. For $螖L\perp c$, the third transition at 8.1 T bifurcates at temperatures below 0.5 K. This is ascribed to the effect of an in-plane uniaxial pressure of about 15 bar, unavoidable in the dilatometer, which breaks the original fourfold in-plane symmetry. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.2731v1-abstract-full').style.display = 'none'; document.getElementById('0909.2731v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 September, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 3 Figures, Manuscript for Proceedings of the International Conference on Quantum Criticality and Novel Phases (QCNP09, Dresden)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0909.1215">arXiv:0909.1215</a> <span> [<a href="https://arxiv.org/pdf/0909.1215">pdf</a>, <a href="https://arxiv.org/ps/0909.1215">ps</a>, <a href="https://arxiv.org/format/0909.1215">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.81.235103">10.1103/PhysRevB.81.235103 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum oscillations near the metamagnetic transition in Sr3Ru2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mercure%2C+J+-">J. -F. Mercure</a>, <a href="/search/cond-mat?searchtype=author&query=Rost%2C+A+W">A. W. Rost</a>, <a href="/search/cond-mat?searchtype=author&query=O%27Farrell%2C+E+C+T">E. C. T. O'Farrell</a>, <a href="/search/cond-mat?searchtype=author&query=Goh%2C+S+K">S. K. Goh</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Sutherland%2C+M+L">M. L. Sutherland</a>, <a href="/search/cond-mat?searchtype=author&query=Grigera%2C+S+A">S. A. Grigera</a>, <a href="/search/cond-mat?searchtype=author&query=Borzi%2C+R+A">R. A. Borzi</a>, <a href="/search/cond-mat?searchtype=author&query=Gegenwart%2C+P">P. Gegenwart</a>, <a href="/search/cond-mat?searchtype=author&query=Gibbs%2C+A+S">A. S. Gibbs</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0909.1215v2-abstract-short" style="display: inline;"> We report detailed investigation of quantum oscillations in Sr3Ru2O7, observed inductively (the de Haas-van Alphen effect) and thermally (the magnetocaloric effect). Working at fields from 3 T to 18 T allowed us to straddle the metamagnetic transition region and probe the low- and high-field Fermi liquids. The observed frequencies are strongly field-dependent in the vicinity of the metamagnetic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.1215v2-abstract-full').style.display = 'inline'; document.getElementById('0909.1215v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0909.1215v2-abstract-full" style="display: none;"> We report detailed investigation of quantum oscillations in Sr3Ru2O7, observed inductively (the de Haas-van Alphen effect) and thermally (the magnetocaloric effect). Working at fields from 3 T to 18 T allowed us to straddle the metamagnetic transition region and probe the low- and high-field Fermi liquids. The observed frequencies are strongly field-dependent in the vicinity of the metamagnetic transition, and there is evidence for magnetic breakdown. We also present the results of a comprehensive rotation study. The most surprising result concerns the field dependence of the measured quasiparticle masses. Contrary to conclusions previously drawn by some of us as a result of a study performed with a much poorer signal to noise ratio, none of the five Fermi surface branches for which we have good field-dependent data gives evidence for a strong field dependence of the mass. The implications of these experimental findings are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.1215v2-abstract-full').style.display = 'none'; document.getElementById('0909.1215v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 March, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 September, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 12 figures, submitted to PRB</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 81, 235103 (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0902.3937">arXiv:0902.3937</a> <span> [<a href="https://arxiv.org/pdf/0902.3937">pdf</a>, <a href="https://arxiv.org/ps/0902.3937">ps</a>, <a href="https://arxiv.org/format/0902.3937">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.103.176401">10.1103/PhysRevLett.103.176401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum oscillations in the anomalous phase in Sr3Ru2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mercure%2C+J+-">J. -F. Mercure</a>, <a href="/search/cond-mat?searchtype=author&query=Goh%2C+S+K">S. K. Goh</a>, <a href="/search/cond-mat?searchtype=author&query=O%27Farrell%2C+E+C+T">E. C. T. O'Farrell</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Sutherland%2C+M+L">M. L. Sutherland</a>, <a href="/search/cond-mat?searchtype=author&query=Rost%2C+A">A. Rost</a>, <a href="/search/cond-mat?searchtype=author&query=Grigera%2C+S+A">S. A. Grigera</a>, <a href="/search/cond-mat?searchtype=author&query=Borzi%2C+R+A">R. A. Borzi</a>, <a href="/search/cond-mat?searchtype=author&query=Gegenwart%2C+P">P. Gegenwart</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0902.3937v2-abstract-short" style="display: inline;"> We report measurements of quantum oscillations detected in the putative nematic phase of Sr3Ru2O7. Significant improvements in sample purity enabled the resolution of small amplitude dHvA oscillations between two first order metamagnetic transitions delimiting the phase. Two distinct frequencies were observed, and their amplitudes follow the normal Lifshitz-Kosevich profile. The Fermi surface sh… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0902.3937v2-abstract-full').style.display = 'inline'; document.getElementById('0902.3937v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0902.3937v2-abstract-full" style="display: none;"> We report measurements of quantum oscillations detected in the putative nematic phase of Sr3Ru2O7. Significant improvements in sample purity enabled the resolution of small amplitude dHvA oscillations between two first order metamagnetic transitions delimiting the phase. Two distinct frequencies were observed, and their amplitudes follow the normal Lifshitz-Kosevich profile. The Fermi surface sheets seem to correspond to a subset of those detected outside the phase. Variations of the dHvA frequencies are explained in terms of a chemical potential shift produced by reaching a peak in the density of states, and an anomalous field dependence of the oscillatory amplitude provides information on domains. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0902.3937v2-abstract-full').style.display = 'none'; document.getElementById('0902.3937v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 January, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 February, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters, 103, 176401 (2009) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0808.0434">arXiv:0808.0434</a> <span> [<a href="https://arxiv.org/pdf/0808.0434">pdf</a>, <a href="https://arxiv.org/ps/0808.0434">ps</a>, <a href="https://arxiv.org/format/0808.0434">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/150/5/052113">10.1088/1742-6596/150/5/052113 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for the Sr2RuO4 intercalations in the Sr3Ru2O7 region of the Sr3Ru2O7-Sr2RuO4 eutectic system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kittaka%2C+S">S. Kittaka</a>, <a href="/search/cond-mat?searchtype=author&query=Yonezawa%2C+S">S. Yonezawa</a>, <a href="/search/cond-mat?searchtype=author&query=Yaguchi%2C+H">H. Yaguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Maeno%2C+Y">Y. Maeno</a>, <a href="/search/cond-mat?searchtype=author&query=Fittipaldi%2C+R">R. Fittipaldi</a>, <a href="/search/cond-mat?searchtype=author&query=Vecchione%2C+A">A. Vecchione</a>, <a href="/search/cond-mat?searchtype=author&query=Mercure%2C+J+-">J. -F. Mercure</a>, <a href="/search/cond-mat?searchtype=author&query=Gibbs%2C+A">A. Gibbs</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0808.0434v1-abstract-short" style="display: inline;"> Although Sr3Ru2O7 has not been reported to exhibit superconductivity so far, ac susceptibility measurements revealed multiple superconducting transitions occurring in the Sr3Ru2O7 region cut from Sr3Ru2O7-Sr2RuO4 eutectic crystals. Based on various experimental results, some of us proposed the scenario in which Sr2RuO4 thin slabs with a few layers of the RuO2 plane are embedded in the Sr3Ru2O7 r… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0808.0434v1-abstract-full').style.display = 'inline'; document.getElementById('0808.0434v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0808.0434v1-abstract-full" style="display: none;"> Although Sr3Ru2O7 has not been reported to exhibit superconductivity so far, ac susceptibility measurements revealed multiple superconducting transitions occurring in the Sr3Ru2O7 region cut from Sr3Ru2O7-Sr2RuO4 eutectic crystals. Based on various experimental results, some of us proposed the scenario in which Sr2RuO4 thin slabs with a few layers of the RuO2 plane are embedded in the Sr3Ru2O7 region as stacking faults and multiple superconducting transitions arise from the distribution of the slab thickness. To examine this scenario, we measured the resistivity along the ab plane (rho_ab) using a Sr3Ru2O7-region sample cut from the eutectic crystal, as well as along the c axis (rho_c) using the same crystal. As a result, we detected resistance drops associated with superconductivity only in rho_ab, but not in rho_c. These results support the Sr2RuO4 thin-slab scenario. In addition, we measured the resistivity of a single crystal of pure Sr3Ru2O7 with very high quality and found that pure Sr3Ru2O7 does not exhibit superconductivity down to 15 mK. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0808.0434v1-abstract-full').style.display = 'none'; document.getElementById('0808.0434v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 August, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 2 figures, Int. Conf. on Low Temperature Physics (LT25)</span> </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Perry%2C+R+S&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Perry%2C+R+S&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Perry%2C+R+S&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div 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