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</div> <div class="control"> <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=Regnault%2C+L&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Regnault%2C+L&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Regnault%2C+L&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Regnault%2C+L&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </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/2209.02061">arXiv:2209.02061</a> <span> [<a href="https://arxiv.org/pdf/2209.02061">pdf</a>, <a href="https://arxiv.org/format/2209.02061">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.106.094427">10.1103/PhysRevB.106.094427 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Possible stripe phases in the multiple magnetization plateaus in TbB$_4$ derived from single-crystal neutron diffraction under pulsed high magnetic fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qureshi%2C+N">N. Qureshi</a>, <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">F. Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Ressouche%2C+E">E. Ressouche</a>, <a href="/search/cond-mat?searchtype=author&query=Knafo%2C+W">W. Knafo</a>, <a href="/search/cond-mat?searchtype=author&query=Iga%2C+F">F. Iga</a>, <a href="/search/cond-mat?searchtype=author&query=Michimura%2C+S">S. Michimura</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">F. Duc</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="2209.02061v1-abstract-short" style="display: inline;"> We present a single-crystal neutron diffraction study on the Shastry-Sutherland lattice system TbB$_4$ at zero magnetic field and under pulsed high magnetic fields up to 35 T applied along the crystallographic $c$ axis. While our results confirm the magnetic structures at zero-field as well as those at the half- and full-magnetization plateaus, they offer new insight into the $\frac{2}{9}$- and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.02061v1-abstract-full').style.display = 'inline'; document.getElementById('2209.02061v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.02061v1-abstract-full" style="display: none;"> We present a single-crystal neutron diffraction study on the Shastry-Sutherland lattice system TbB$_4$ at zero magnetic field and under pulsed high magnetic fields up to 35 T applied along the crystallographic $c$ axis. While our results confirm the magnetic structures at zero-field as well as those at the half- and full-magnetization plateaus, they offer new insight into the $\frac{2}{9}$- and $\frac{1}{3}$-magnetization plateaus observed in this system. A stripe model of polarized 4-spin-plaquettes whose stripe density proportionally increases with the macroscopic magnetization is in full agreement with the neutron diffraction data. Equally well suited alternative models exist which explain the observed Bragg peaks which are inherently limited in a pulsed high magnetic field experiment. We discuss the different intensity distribution in $Q$ space which can be used to distinguish these models in future experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.02061v1-abstract-full').style.display = 'none'; document.getElementById('2209.02061v1-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 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2202.05462">arXiv:2202.05462</a> <span> [<a href="https://arxiv.org/pdf/2202.05462">pdf</a>, <a href="https://arxiv.org/format/2202.05462">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 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.104.224433">10.1103/PhysRevB.104.224433 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Disorder-induced broadening of the spin waves in a triangular-lattice quantum-spin-liquid candidate YbZnGaO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ma%2C+Z">Zhen Ma</a>, <a href="/search/cond-mat?searchtype=author&query=Dong%2C+Z">Zhao-Yang Dong</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+J">Jinghui Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+S">Shuhan Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Ran%2C+K">Kejing Ran</a>, <a href="/search/cond-mat?searchtype=author&query=Bao%2C+S">Song Bao</a>, <a href="/search/cond-mat?searchtype=author&query=Cai%2C+Z">Zhengwei Cai</a>, <a href="/search/cond-mat?searchtype=author&query=Shangguan%2C+Y">Yanyan Shangguan</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+W">Wei Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Boehm%2C+M">M. Boehm</a>, <a href="/search/cond-mat?searchtype=author&query=Steffens%2C+P">P. Steffens</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+X">Xiao Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Y">Yixi Su</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+S">Shun-Li Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+J">Jun-Ming Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">Jian-Xin Li</a>, <a href="/search/cond-mat?searchtype=author&query=Wen%2C+J">Jinsheng Wen</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="2202.05462v1-abstract-short" style="display: inline;"> Disorder is important in the study of quantum spin liquids, but its role on the spin dynamics remains elusive. Here, we explore the disorder effect by investigating the magnetic-field dependence of the low-energy magnetic excitations in a triangular-lattice frustrated magnet YbZnGaO$_4$ with inelastic neutron scattering. With an intermediate field of 2.5 T applied along the $c$-axis, the broad con… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.05462v1-abstract-full').style.display = 'inline'; document.getElementById('2202.05462v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.05462v1-abstract-full" style="display: none;"> Disorder is important in the study of quantum spin liquids, but its role on the spin dynamics remains elusive. Here, we explore the disorder effect by investigating the magnetic-field dependence of the low-energy magnetic excitations in a triangular-lattice frustrated magnet YbZnGaO$_4$ with inelastic neutron scattering. With an intermediate field of 2.5 T applied along the $c$-axis, the broad continuum at zero field becomes more smeared both in energy and momentum. With a field up to 10 T, which fully polarizes the magnetic moments, we observe clear spin-wave excitations with a gap of $\sim$1.4 meV comparable to the bandwidth. However, the spectra are significantly broadened. The excitation spectra both at zero and high fields can be reproduced by performing classical Monte Carlo simulations which take into account the disorder effect arising from the random site mixing of nonmagnetic Zn$^{2+}$ and Ga$^{3+}$ ions. These results elucidate the critical role of disorder in broadening the magnetic excitation spectra and mimicking the spin-liquid features in frustrated quantum magnets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.05462v1-abstract-full').style.display = 'none'; document.getElementById('2202.05462v1-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 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">Published in PRB, 10 pages, 3 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 104, 224433 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.01099">arXiv:2102.01099</a> <span> [<a href="https://arxiv.org/pdf/2102.01099">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/10.1103/PhysRevB.103.094424">10.1103/PhysRevB.103.094424 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic order in the quasi-one-dimensional Ising system RbCoCl$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=H%C3%A4nni%2C+N+P">N. P. H盲nni</a>, <a href="/search/cond-mat?searchtype=author&query=Sheptyakov%2C+D">D. Sheptyakov</a>, <a href="/search/cond-mat?searchtype=author&query=Mena%2C+M">M. Mena</a>, <a href="/search/cond-mat?searchtype=author&query=Hirtenlechner%2C+E">E. Hirtenlechner</a>, <a href="/search/cond-mat?searchtype=author&query=Keller%2C+L">L. Keller</a>, <a href="/search/cond-mat?searchtype=author&query=Stuhr%2C+U">U. Stuhr</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Medarde%2C+M">M. Medarde</a>, <a href="/search/cond-mat?searchtype=author&query=Cervellino%2C+A">A. Cervellino</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=Normand%2C+B">B. Normand</a>, <a href="/search/cond-mat?searchtype=author&query=Kr%C3%A4mer%2C+K+W">K. W. Kr盲mer</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="2102.01099v1-abstract-short" style="display: inline;"> The dynamical properties of free and bound domain-wall excitations in Ising-chain materials have recently become the focus of intense research interest. New materials and spectrometers have made it possible to control the environment of coupled Ising chains by both effective internal and applied external fields, which can be both longitudinal and transverse, and thus to demonstrate how the resulti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.01099v1-abstract-full').style.display = 'inline'; document.getElementById('2102.01099v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.01099v1-abstract-full" style="display: none;"> The dynamical properties of free and bound domain-wall excitations in Ising-chain materials have recently become the focus of intense research interest. New materials and spectrometers have made it possible to control the environment of coupled Ising chains by both effective internal and applied external fields, which can be both longitudinal and transverse, and thus to demonstrate how the resulting magnetic phase transitions and the nature of the associated excited states obey fundamental symmetry properties. In RbCoCl$_3$, the weakly coupled Ising chains form a triangular lattice whose frustrated geometry and magnetic ordering transitions at low temperature open new possibilities for the Ising-chain environment. We have investigated the structure and magnetism in RbCoCl$_3$ by high-resolution x-ray diffraction and neutron scattering measurements on powder and single crystal samples between 1.5 K and 300 K. Upon cooling, the Co$^{2+}$ spins develop one-dimensional antiferromagnetic correlations along the chain axis ($c$-axis) below 90 K. Below the first N茅el temperature, $T_{N1}$ = 28 K, a partial 3D magnetic order sets in, with propagation vector ${\vec k}_1$ = (1/3,1/3,1), the moments aligned along the $c$-axis and every third chain uncorrelated from its neighbours. Only below a second magnetic phase transition at $T_{N2}$ = 13 K does the system achieve a fully ordered state, with two additional propagation vectors: ${\vec k}_2$ = (0,0,1) establishes a "honeycomb" $c$-axis order, in which 1/3 of the chains are subject to a strong effective mean field due to their neighbours whereas 2/3 experience no net field, while ${\vec k}_3$ = (1/2,0,1) governs a small, staggered in-plane ordered moment. We conclude that RbCoCl$_3$ is an excellent material to study the physics of Ising chains in a wide variety of temperature-controlled environments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.01099v1-abstract-full').style.display = 'none'; document.getElementById('2102.01099v1-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 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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+3 pages, 10+2 figures, 6+4 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 103, 094424 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.01405">arXiv:2004.01405</a> <span> [<a href="https://arxiv.org/pdf/2004.01405">pdf</a>, <a href="https://arxiv.org/format/2004.01405">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> <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/10.1103/PhysRevResearch.2.022018">10.1103/PhysRevResearch.2.022018 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin-Excitations Anisotropy in the Bilayer Iron-Based Superconductor CaKFe$_4$As$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Xie%2C+T">Tao Xie</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+C">Chang Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">Frederic Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+S">Shiliang Li</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+H">Huiqian Luo</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="2004.01405v1-abstract-short" style="display: inline;"> We use polarized inelastic neutron scattering to study the spin-excitations anisotropy in the bilayer iron-based superconductor CaKFe$_4$As$_4$ ($T_c$ = 35 K). In the superconducting state, both odd and even $L-$modulations of spin resonance have been observed in our previous unpolarized neutron scattering experiments (T. Xie {\it et al.} Phys. Rev. Lett. {\bf 120}, 267003 (2018)). Here we find th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.01405v1-abstract-full').style.display = 'inline'; document.getElementById('2004.01405v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.01405v1-abstract-full" style="display: none;"> We use polarized inelastic neutron scattering to study the spin-excitations anisotropy in the bilayer iron-based superconductor CaKFe$_4$As$_4$ ($T_c$ = 35 K). In the superconducting state, both odd and even $L-$modulations of spin resonance have been observed in our previous unpolarized neutron scattering experiments (T. Xie {\it et al.} Phys. Rev. Lett. {\bf 120}, 267003 (2018)). Here we find that the high-energy even mode ($\sim 18$ meV) is isotropic in spin space, but the low-energy odd modes consist of a $c-$axis polarized mode around 9 meV along with another partially overlapped in-plane mode around 12 meV. We argue that such spin anisotropy is induced by the spin-orbit coupling in the spin-vortex-type fluctuations of this unique compound. The spin anisotropy is strongly affected by the superconductivity, where it is weak below 6 meV in the normal state and then transferred to higher energy and further enhanced in the odd mode of spin resonance below $T_c$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.01405v1-abstract-full').style.display = 'none'; document.getElementById('2004.01405v1-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> 3 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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. Accepted by Physical Review Research</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Research 2, 022018(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/1812.07267">arXiv:1812.07267</a> <span> [<a href="https://arxiv.org/pdf/1812.07267">pdf</a>, <a href="https://arxiv.org/format/1812.07267">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/10.1088/1361-648X/aafaeb">10.1088/1361-648X/aafaeb <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic excitations in frustrated fcc type-III antiferromagnet MnS$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chatterji%2C+T">T. Chatterji</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Ghosh%2C+S">S. Ghosh</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+A">A. Singh</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="1812.07267v1-abstract-short" style="display: inline;"> Spin wave dispersion in the frustrated fcc type-III antiferromagnet MnS$_2$ has been determined by inelastic neutron scattering using a triple-axis spectrometer. Existence of multiple spin wave branches, with significant separation between high-energy and low-energy modes highlighting the intrinsic magnetic frustration effect on the fcc lattice, is explained in terms of a spin wave analysis carrie… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07267v1-abstract-full').style.display = 'inline'; document.getElementById('1812.07267v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.07267v1-abstract-full" style="display: none;"> Spin wave dispersion in the frustrated fcc type-III antiferromagnet MnS$_2$ has been determined by inelastic neutron scattering using a triple-axis spectrometer. Existence of multiple spin wave branches, with significant separation between high-energy and low-energy modes highlighting the intrinsic magnetic frustration effect on the fcc lattice, is explained in terms of a spin wave analysis carried out for the antiferromagnetic Heisenberg model for this $S=5/2$ system with nearest and next-nearest-neighbor exchange interactions. Comparison of the calculated dispersion with spin wave measurement also reveals small suppression of magnetic frustration resulting from reduced exchange interaction between frustrated spins, possibly arising from anisotropic deformation of the cubic structure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07267v1-abstract-full').style.display = 'none'; document.getElementById('1812.07267v1-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 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1805.03249">arXiv:1805.03249</a> <span> [<a href="https://arxiv.org/pdf/1805.03249">pdf</a>, <a href="https://arxiv.org/format/1805.03249">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</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/10.1063/1.5028487">10.1063/1.5028487 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> 40-tesla pulsed-field cryomagnet for single crystal neutron diffraction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">Fabienne Duc</a>, <a href="/search/cond-mat?searchtype=author&query=Tonon%2C+X">Xavier Tonon</a>, <a href="/search/cond-mat?searchtype=author&query=Billette%2C+J">Julien Billette</a>, <a href="/search/cond-mat?searchtype=author&query=Rollet%2C+B">Bertrand Rollet</a>, <a href="/search/cond-mat?searchtype=author&query=Knafo%2C+W">William Knafo</a>, <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">Fr茅d茅ric Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=B%C3%A9ard%2C+J">J茅rome B茅ard</a>, <a href="/search/cond-mat?searchtype=author&query=Mantegazza%2C+F">Fr茅d茅ric Mantegazza</a>, <a href="/search/cond-mat?searchtype=author&query=Longuet%2C+B">Benjamin Longuet</a>, <a href="/search/cond-mat?searchtype=author&query=Lorenzo%2C+J">Jose-Emilio Lorenzo</a>, <a href="/search/cond-mat?searchtype=author&query=Leli%C3%A8vre-Berna%2C+E">Eddy Leli猫vre-Berna</a>, <a href="/search/cond-mat?searchtype=author&query=Frings%2C+P">Paul Frings</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</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="1805.03249v1-abstract-short" style="display: inline;"> We present the first long-duration and high duty cycle 40-tesla pulsed-field cryomagnet addressed to single crystal neutron diffraction experiments at temperatures down to 2 K. The magnet produces a horizontal field in a bi-conical geometry, $\pm$15 and $\pm$30掳 upstream and downstream of the sample, respectively. Using a 1.15MJ mobile generator, magnetic field pulses of 100 ms length are generate… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.03249v1-abstract-full').style.display = 'inline'; document.getElementById('1805.03249v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.03249v1-abstract-full" style="display: none;"> We present the first long-duration and high duty cycle 40-tesla pulsed-field cryomagnet addressed to single crystal neutron diffraction experiments at temperatures down to 2 K. The magnet produces a horizontal field in a bi-conical geometry, $\pm$15 and $\pm$30掳 upstream and downstream of the sample, respectively. Using a 1.15MJ mobile generator, magnetic field pulses of 100 ms length are generated in the magnet, with a rise time of 23 ms and a repetition rate of 6-7 pulses per hour at 40 T. The setup was validated for neutron diffraction on the CEA-CRG three-axis spectrometer IN22 at the ILL. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.03249v1-abstract-full').style.display = 'none'; document.getElementById('1805.03249v1-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, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Review of Scientific Instruments, Volume 89, Issue 5, 053905 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.00779">arXiv:1803.00779</a> <span> [<a href="https://arxiv.org/pdf/1803.00779">pdf</a>, <a href="https://arxiv.org/format/1803.00779">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> <span class="tag is-small is-grey 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/10.1103/PhysRevLett.120.137001">10.1103/PhysRevLett.120.137001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Neutron spin resonance in the 112-type iron-based superconductor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Xie%2C+T">Tao Xie</a>, <a href="/search/cond-mat?searchtype=author&query=Gong%2C+D">Dongliang Gong</a>, <a href="/search/cond-mat?searchtype=author&query=Ghosh%2C+H">Haranath Ghosh</a>, <a href="/search/cond-mat?searchtype=author&query=Ghosh%2C+A">Abyay Ghosh</a>, <a href="/search/cond-mat?searchtype=author&query=Soda%2C+M">Minoru Soda</a>, <a href="/search/cond-mat?searchtype=author&query=Masuda%2C+T">Takatsugu Masuda</a>, <a href="/search/cond-mat?searchtype=author&query=Itoh%2C+S">Shinichi Itoh</a>, <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">Frederic Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Danilkin%2C+S">Sergey Danilkin</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+S">Shiliang Li</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+H">Huiqian Luo</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="1803.00779v2-abstract-short" style="display: inline;"> We use inelastic neutron scattering to study the low-energy spin excitations of 112-type iron pnictide Ca$_{0.82}$La$_{0.18}$Fe$_{0.96}$Ni$_{0.04}$As$_{2}$ with bulk superconductivity below $T_c=22$ K. A two-dimensional spin resonance mode is found around $E=$ 11 meV, where the resonance energy is almost temperature independent and linearly scales with $T_c$ along with other iron-based superconduc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.00779v2-abstract-full').style.display = 'inline'; document.getElementById('1803.00779v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.00779v2-abstract-full" style="display: none;"> We use inelastic neutron scattering to study the low-energy spin excitations of 112-type iron pnictide Ca$_{0.82}$La$_{0.18}$Fe$_{0.96}$Ni$_{0.04}$As$_{2}$ with bulk superconductivity below $T_c=22$ K. A two-dimensional spin resonance mode is found around $E=$ 11 meV, where the resonance energy is almost temperature independent and linearly scales with $T_c$ along with other iron-based superconductors. Polarized neutron analysis reveals the resonance is nearly isotropic in spin space without any $L$ modulations. Due to the unique monoclinic structure with additional zigzag arsenic chains, the As $4p$ orbitals contribute to a three-dimensional hole pocket around $螕$ point and an extra electron pocket at $X$ point. Our results suggest that the energy and momentum distribution of spin resonance does not directly response to the $k_z$ dependence of fermiology, and the spin resonance intrinsically is a spin-1 mode from singlet-triplet excitations of the Cooper pairs in the case of weak spin-orbital coupling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.00779v2-abstract-full').style.display = 'none'; document.getElementById('1803.00779v2-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 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 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">9 pages, 8 figures, with supplementary materials</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters 120, 137001 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1801.06588">arXiv:1801.06588</a> <span> [<a href="https://arxiv.org/pdf/1801.06588">pdf</a>, <a href="https://arxiv.org/format/1801.06588">other</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/10.1016/j.heliyon.2018.e00507">10.1016/j.heliyon.2018.e00507 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Polarized-neutron investigation of magnetic ordering and spin dynamics in BaCo$_2$(AsO$_4$)$_2$ frustrated honeycomb-lattice magnet </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Boullier%2C+C">C. Boullier</a>, <a href="/search/cond-mat?searchtype=author&query=Lorenzo%2C+J+E">J. E. Lorenzo</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="1801.06588v1-abstract-short" style="display: inline;"> The magnetic properties of the cobaltite {\BCAO}, a good realization of the quasi two-dimensional frustrated honeycomb-lattice system with strong planar anisotropy, have been reinvestigated by means of spherical neutron polarimetry with CRYOPAD. From accurate measurements of polarization matrices both on elastic and inelastic contributions as a function of the scattering vector {\bf{Q}}, we have b… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.06588v1-abstract-full').style.display = 'inline'; document.getElementById('1801.06588v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.06588v1-abstract-full" style="display: none;"> The magnetic properties of the cobaltite {\BCAO}, a good realization of the quasi two-dimensional frustrated honeycomb-lattice system with strong planar anisotropy, have been reinvestigated by means of spherical neutron polarimetry with CRYOPAD. From accurate measurements of polarization matrices both on elastic and inelastic contributions as a function of the scattering vector {\bf{Q}}, we have been able to determine the low-temperature magnetic structure of {\BCAO} and reveal its puzzling in-plane spin dynamics. Surprisingly, the ground-state structure (described by an incommensurate propagation vector ${\bf{k}}_{1}=(k_{x}, 0, k_{z}$), with $k_{x}=0.270{\pm}0.005$ and $k_{z} \approx -1.31$) appears to be a quasi-collinear structure, and not a simple helix, as previously determined. In addition, our results have revealed the existence of a non-negligible out-of-plane moment component $ \approx 0.25渭_{B}$/Co$^{2+}$, representing about 10\% of the in-plane component, as demonstrated by the presence of finite off-diagonal elements $P_{yz}$ and $P_{zy}$ of the polarization matrix, both on elastic and inelastic magnetic contributions. Despite a clear evidence of the existence of a slightly inelastic contribution of structural origin superimposed to the magnetic excitations at the scattering vectors ${\bf{Q}}=(0.27, 0, 3.1)$ and ${\bf{Q}}=(0.73, 0, 0.8)$ (energy transfer $螖E \approx 2.3$ meV), no strong inelastic nuclear-magnetic interference terms could be detected so far, meaning that the nuclear and magnetic degrees of freedom have very weak cross-correlations. The strong inelastic $P_{yz}$ and $P_{zy}$ matrix elements can be understood by assuming that the magnetic excitations in {\BCAO} are spin waves associated with trivial anisotropic precessions of the magnetic moments involved in the canted incommensurate structure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.06588v1-abstract-full').style.display = 'none'; document.getElementById('1801.06588v1-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 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">43 pages, 16 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Heliyon 4, e00507 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1801.04019">arXiv:1801.04019</a> <span> [<a href="https://arxiv.org/pdf/1801.04019">pdf</a>, <a href="https://arxiv.org/ps/1801.04019">ps</a>, <a href="https://arxiv.org/format/1801.04019">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> <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/10.1103/PhysRevB.97.024519">10.1103/PhysRevB.97.024519 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin-isotropic continuum of spin excitations in antiferromagnetically ordered Fe$_{1.07}$Te </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu Song</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+X">Xingye Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Y">Yixi Su</a>, <a href="/search/cond-mat?searchtype=author&query=Lai%2C+H">Hsin-Hua Lai</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">Wen-Jun Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Si%2C+Q">Qimiao Si</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="1801.04019v1-abstract-short" style="display: inline;"> Unconventional superconductivity typically emerges in the presence of quasi-degenerate ground states, and the associated intense fluctuations are likely responsible for generating the superconducting state. Here we use polarized neutron scattering to study the spin space anisotropy of spin excitations in Fe$_{1.07}$Te exhibiting bicollinear antiferromagnetic (AF) order, the parent compound of FeTe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.04019v1-abstract-full').style.display = 'inline'; document.getElementById('1801.04019v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.04019v1-abstract-full" style="display: none;"> Unconventional superconductivity typically emerges in the presence of quasi-degenerate ground states, and the associated intense fluctuations are likely responsible for generating the superconducting state. Here we use polarized neutron scattering to study the spin space anisotropy of spin excitations in Fe$_{1.07}$Te exhibiting bicollinear antiferromagnetic (AF) order, the parent compound of FeTe$_{1-x}$Se$_x$ superconductors. We confirm that the low energy spin excitations are transverse spin waves, consistent with a local-moment origin of the bicollinear AF order. While the ordered moments lie in the $ab$-plane in Fe$_{1.07}$Te, it takes less energy for them to fluctuate out-of-plane, similar to BaFe$_2$As$_2$ and NaFeAs. At energies above $E\gtrsim20$ meV, we find magnetic scattering to be dominated by an isotropic continuum that persists up to at least 50 meV. Although the isotropic spin excitations cannot be ascribed to spin waves from a long-range ordered local moment antiferromagnet, the continuum can result from the bicollinear magnetic order ground state of Fe$_{1.07}$Te being quasi-degenerate with plaquette magnetic order. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.04019v1-abstract-full').style.display = 'none'; document.getElementById('1801.04019v1-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, 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">accepted for publication in Phys. Rev. B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.01497">arXiv:1711.01497</a> <span> [<a href="https://arxiv.org/pdf/1711.01497">pdf</a>, <a href="https://arxiv.org/ps/1711.01497">ps</a>, <a href="https://arxiv.org/format/1711.01497">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.96.180503">10.1103/PhysRevB.96.180503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin excitation anisotropy in optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hu%2C+D">Ding Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+W">Wenliang Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Wei%2C+Y">Yuan Wei</a>, <a href="/search/cond-mat?searchtype=author&query=Roessli%2C+B">Bertrand Roessli</a>, <a href="/search/cond-mat?searchtype=author&query=Skoulatos%2C+M">Markos Skoulatos</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">Louis Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+G">Genfu Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu Song</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+H">Huiqian Luo</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+S">Shiliang Li</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="1711.01497v1-abstract-short" style="display: inline;"> We use neutron polarization analysis to study spin excitation anisotropy in the optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2 (Tc = 30 K). Different from optimally hole and electron-doped BaFe2As2, where there is a clear spin excitation anisotropy in the paramagnetic tetragonal state well above Tc, we find no spin excitation anisotropy for energies above 2 meV in the normal state of BaF… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.01497v1-abstract-full').style.display = 'inline'; document.getElementById('1711.01497v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.01497v1-abstract-full" style="display: none;"> We use neutron polarization analysis to study spin excitation anisotropy in the optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2 (Tc = 30 K). Different from optimally hole and electron-doped BaFe2As2, where there is a clear spin excitation anisotropy in the paramagnetic tetragonal state well above Tc, we find no spin excitation anisotropy for energies above 2 meV in the normal state of BaFe2(As0.7P0.3)2. Upon entering the superconducting state, significant spin excitation anisotropy develops at the antiferromagnetic (AF) zone center QAF = (1, 0, L = odd), while magnetic spectrum is isotropy at the zone boundary Q = (1, 0, L = even). By comparing temperature, wave vector, and polarization dependence of the spin excitation anisotropy in BaFe2(As0.7P0.3)2 and hole-doped Ba0.67K0.33Fe2As2 (Tc = 38 K), we conclude that such anisotropy arises from spin-orbit coupling and is associated with the nearby AF order and superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.01497v1-abstract-full').style.display = 'none'; document.getElementById('1711.01497v1-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, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.06122">arXiv:1708.06122</a> <span> [<a href="https://arxiv.org/pdf/1708.06122">pdf</a>, <a href="https://arxiv.org/format/1708.06122">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/10.1016/j.physb.2017.09.062">10.1016/j.physb.2017.09.062 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> URu$_2$Si$_2$ under intense magnetic fields: from hidden order to spin-density wave </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Knafo%2C+W">W. Knafo</a>, <a href="/search/cond-mat?searchtype=author&query=Aoki%2C+D">D. Aoki</a>, <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G+W">G. W. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">F. Duc</a>, <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">F. Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Kuwahara%2C+K">K. Kuwahara</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">H. Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Flouquet%2C+J">J. Flouquet</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="1708.06122v1-abstract-short" style="display: inline;"> A review of recent state-of-the-art pulsed field experiments performed on URu$_2$Si$_2$ under a magnetic field applied along its easy magnetic axis $\mathbf{c}$ is given. Resistivity, magnetization, magnetic susceptibility, Shubnikov-de Haas, and neutron diffraction experiments are presented, permitting to emphasize the relationship between Fermi surface reconstructions, the destruction of the hid… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.06122v1-abstract-full').style.display = 'inline'; document.getElementById('1708.06122v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.06122v1-abstract-full" style="display: none;"> A review of recent state-of-the-art pulsed field experiments performed on URu$_2$Si$_2$ under a magnetic field applied along its easy magnetic axis $\mathbf{c}$ is given. Resistivity, magnetization, magnetic susceptibility, Shubnikov-de Haas, and neutron diffraction experiments are presented, permitting to emphasize the relationship between Fermi surface reconstructions, the destruction of the hidden-order and the appearance of a spin-density wave state in a high magnetic field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.06122v1-abstract-full').style.display = 'none'; document.getElementById('1708.06122v1-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 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">14 pages, 2 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/1706.05848">arXiv:1706.05848</a> <span> [<a href="https://arxiv.org/pdf/1706.05848">pdf</a>, <a href="https://arxiv.org/format/1706.05848">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/s41567-018-0126-8">10.1038/s41567-018-0126-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo$_2$V$_2$O$_8$ </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=Takayoshi%2C+S">S. Takayoshi</a>, <a href="/search/cond-mat?searchtype=author&query=Petit%2C+S">S. Petit</a>, <a href="/search/cond-mat?searchtype=author&query=Simonet%2C+V">V. Simonet</a>, <a href="/search/cond-mat?searchtype=author&query=Raymond%2C+S">S. Raymond</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Boehm%2C+M">M. Boehm</a>, <a href="/search/cond-mat?searchtype=author&query=White%2C+J+S">J. S. White</a>, <a href="/search/cond-mat?searchtype=author&query=M%C3%A5nsson%2C+M">M. M氓nsson</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=Lejay%2C+P">P. Lejay</a>, <a href="/search/cond-mat?searchtype=author&query=Canals%2C+B">B. Canals</a>, <a href="/search/cond-mat?searchtype=author&query=Lorenz%2C+T">T. Lorenz</a>, <a href="/search/cond-mat?searchtype=author&query=Furuya%2C+S+C">S. C. Furuya</a>, <a href="/search/cond-mat?searchtype=author&query=Giamarchi%2C+T">T. Giamarchi</a>, <a href="/search/cond-mat?searchtype=author&query=Grenier%2C+B">B. Grenier</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="1706.05848v3-abstract-short" style="display: inline;"> Since the seminal ideas of Berezinskii, Kosterlitz and Thouless, topological excitations are at the heart of our understanding of a whole novel class of phase transitions. In most of the cases, those transitions are controlled by a single type of topological objects. There are however some situations, still poorly understood, where two dual topological excitations fight to control the phase diagra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.05848v3-abstract-full').style.display = 'inline'; document.getElementById('1706.05848v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.05848v3-abstract-full" style="display: none;"> Since the seminal ideas of Berezinskii, Kosterlitz and Thouless, topological excitations are at the heart of our understanding of a whole novel class of phase transitions. In most of the cases, those transitions are controlled by a single type of topological objects. There are however some situations, still poorly understood, where two dual topological excitations fight to control the phase diagram and the transition. Finding experimental realization of such cases is thus of considerable interest. We show here that this situation occurs in BaCo$_2$V$_2$O$_8$, a spin-1/2 Ising-like quasi-one dimensional antiferromagnet when subjected to a uniform magnetic field transverse to the Ising axis. Using neutron scattering experiments, we measure a drastic modification of the quantum excitations beyond a critical value of the magnetic field. This quantum phase transition is identified, through a comparison with theoretical calculations, to be a transition between two different types of solitonic topological objects, which are captured by different components of the dynamical structure factor. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.05848v3-abstract-full').style.display = 'none'; document.getElementById('1706.05848v3-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> 8 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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, 4 figures; 10 additional pages of supplemental information containing 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Physics 14, 716 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1702.02329">arXiv:1702.02329</a> <span> [<a href="https://arxiv.org/pdf/1702.02329">pdf</a>, <a href="https://arxiv.org/format/1702.02329">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.95.134430">10.1103/PhysRevB.95.134430 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Absence of long range order in the frustrated magnet SrDy$_2$O$_4$ due to trapped defects from a dimensionality crossover </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gauthier%2C+N">N. Gauthier</a>, <a href="/search/cond-mat?searchtype=author&query=Fennell%2C+A">A. Fennell</a>, <a href="/search/cond-mat?searchtype=author&query=Pr%C3%A9vost%2C+B">B. Pr茅vost</a>, <a href="/search/cond-mat?searchtype=author&query=Uldry%2C+A+-">A. -C. Uldry</a>, <a href="/search/cond-mat?searchtype=author&query=Delley%2C+B">B. Delley</a>, <a href="/search/cond-mat?searchtype=author&query=Sibille%2C+R">R. Sibille</a>, <a href="/search/cond-mat?searchtype=author&query=D%C3%A9silets-Benoit%2C+A">A. D茅silets-Benoit</a>, <a href="/search/cond-mat?searchtype=author&query=Dabkowska%2C+H+A">H. A. Dabkowska</a>, <a href="/search/cond-mat?searchtype=author&query=Nilsen%2C+G">G. Nilsen</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=White%2C+J+S">J. S. White</a>, <a href="/search/cond-mat?searchtype=author&query=Niedermayer%2C+C">C. Niedermayer</a>, <a href="/search/cond-mat?searchtype=author&query=Pomjakushin%2C+V">V. Pomjakushin</a>, <a href="/search/cond-mat?searchtype=author&query=Bianchi%2C+A+D">A. D. Bianchi</a>, <a href="/search/cond-mat?searchtype=author&query=Kenzelmann%2C+M">M. Kenzelmann</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="1702.02329v2-abstract-short" style="display: inline;"> Magnetic frustration and low dimensionality can prevent long range magnetic order and lead to exotic correlated ground states. SrDy$_2$O$_4$ consists of magnetic Dy$^{3+}$ ions forming magnetically frustrated zig-zag chains along the c-axis and shows no long range order to temperatures as low as $T=60$ mK. We carried out neutron scattering and AC magnetic susceptibility measurements using powder a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.02329v2-abstract-full').style.display = 'inline'; document.getElementById('1702.02329v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1702.02329v2-abstract-full" style="display: none;"> Magnetic frustration and low dimensionality can prevent long range magnetic order and lead to exotic correlated ground states. SrDy$_2$O$_4$ consists of magnetic Dy$^{3+}$ ions forming magnetically frustrated zig-zag chains along the c-axis and shows no long range order to temperatures as low as $T=60$ mK. We carried out neutron scattering and AC magnetic susceptibility measurements using powder and single crystals of SrDy$_2$O$_4$. Diffuse neutron scattering indicates strong one-dimensional (1D) magnetic correlations along the chain direction that can be qualitatively accounted for by the axial next-nearest neighbour Ising (ANNNI) model with nearest-neighbor and next-nearest-neighbor exchange $J_1=0.3$ meV and $J_2=0.2$ meV, respectively. Three-dimensional (3D) correlations become important below $T^*\approx0.7$ K. At $T=60$ mK, the short range correlations are characterized by a putative propagation vector $\textbf{k}_{1/2}=(0,\frac{1}{2},\frac{1}{2})$. We argue that the absence of long range order arises from the presence of slowly decaying 1D domain walls that are trapped due to 3D correlations. This stabilizes a low-temperature phase without long range magnetic order, but with well-ordered chain segments separated by slowly-moving domain walls. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.02329v2-abstract-full').style.display = 'none'; document.getElementById('1702.02329v2-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 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">13 pages, 14 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 95, 134430 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.00379">arXiv:1612.00379</a> <span> [<a href="https://arxiv.org/pdf/1612.00379">pdf</a>, <a href="https://arxiv.org/format/1612.00379">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> <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/10.1103/PhysRevB.94.214516">10.1103/PhysRevB.94.214516 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba$_{0.67}$K$_{0.33}$Fe$_{2}$As$_{2}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu Song</a>, <a href="/search/cond-mat?searchtype=author&query=Man%2C+H">Haoran Man</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+R">Rui Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+X">Xingye Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chenglin Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M">Meng Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Tan%2C+G">Guotai Tan</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Y">Yixi Su</a>, <a href="/search/cond-mat?searchtype=author&query=Kang%2C+J">Jian Kang</a>, <a href="/search/cond-mat?searchtype=author&query=Fernandes%2C+R+M">Rafael M. Fernandes</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="1612.00379v2-abstract-short" style="display: inline;"> We use polarized inelastic neutron scattering to study the temperature and energy dependence of spin space anisotropies in the optimally hole-doped iron pnictide Ba$_{0.67}$K$_{0.33}$Fe$_{2}$As$_{2}$ ($T_{\rm c}=38$ K). In the superconducting state, while the high-energy part of the magnetic spectrum is nearly isotropic, the low-energy part displays a pronouced anisotropy, manifested by a $c$-axis… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.00379v2-abstract-full').style.display = 'inline'; document.getElementById('1612.00379v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.00379v2-abstract-full" style="display: none;"> We use polarized inelastic neutron scattering to study the temperature and energy dependence of spin space anisotropies in the optimally hole-doped iron pnictide Ba$_{0.67}$K$_{0.33}$Fe$_{2}$As$_{2}$ ($T_{\rm c}=38$ K). In the superconducting state, while the high-energy part of the magnetic spectrum is nearly isotropic, the low-energy part displays a pronouced anisotropy, manifested by a $c$-axis polarized resonance. We also observe that the spin anisotropy in superconducting Ba$_{0.67}$K$_{0.33}$Fe$_{2}$As$_{2}$ extends to higher energies compared to electron-doped BaFe$_{2-x}TM_{x}$As$_{2}$ ($TM=$Co, Ni) and isovalent-doped BaFe$_{2}$As$_{1.4}$P$_{0.6}$, suggesting a connection between $T_{\rm c}$ and the energy scale of the spin anisotropy. In the normal state, the low-energy spin anisotropy for optimally hole- and electron-doped iron pnictides onset at temperatures similar to the temperatures at which the elastoresistance deviate from Curie-Weiss behavior, pointing to a possible connection between the two phenomena. Our results highlight the relevance of the spin-orbit coupling to the superconductivity of the iron pnictides. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.00379v2-abstract-full').style.display = 'none'; document.getElementById('1612.00379v2-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 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">accepted for publication in Physical Review B, Supplementary information is appended at the end of the arxiv version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 94, 214516 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1611.01321">arXiv:1611.01321</a> <span> [<a href="https://arxiv.org/pdf/1611.01321">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/ncomms13075">10.1038/ncomms13075 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Field-induced spin-density wave beyond hidden order in URu2Si2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Knafo%2C+W">W. Knafo</a>, <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">F. Duc</a>, <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">F. Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Kuwahara%2C+K">K. Kuwahara</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">H. Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Aoki%2C+D">D. Aoki</a>, <a href="/search/cond-mat?searchtype=author&query=Billette%2C+J">J. Billette</a>, <a href="/search/cond-mat?searchtype=author&query=Frings%2C+P">P. Frings</a>, <a href="/search/cond-mat?searchtype=author&query=Tonon%2C+X">X. Tonon</a>, <a href="/search/cond-mat?searchtype=author&query=Leli%C3%A8vre-Berna%2C+E">E. Leli猫vre-Berna</a>, <a href="/search/cond-mat?searchtype=author&query=Flouquet%2C+J">J. Flouquet</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</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="1611.01321v1-abstract-short" style="display: inline;"> URu2Si2 is one of the most enigmatic strongly-correlated-electron systems and offers a fertile testing ground for new concepts in condensed matter science. In spite of >30 years of intense research, no consensus on the order parameter of its low-temperature hidden-order phase exists. A strong magnetic field transforms the hidden order into magnetically-ordered phases, whose order parameter has als… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.01321v1-abstract-full').style.display = 'inline'; document.getElementById('1611.01321v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1611.01321v1-abstract-full" style="display: none;"> URu2Si2 is one of the most enigmatic strongly-correlated-electron systems and offers a fertile testing ground for new concepts in condensed matter science. In spite of >30 years of intense research, no consensus on the order parameter of its low-temperature hidden-order phase exists. A strong magnetic field transforms the hidden order into magnetically-ordered phases, whose order parameter has also been defying experimental observation. Here, thanks to an instrumentation breakthrough in high-field neutron scattering, we identify the field-induced phases of URu2Si2 as a spin-density-wave state with wavevector k1 = (0.6 0 0). The transition to the spin-density wave represents a unique touchstone for understanding the hidden-order phase. An intimate relationship between this magnetic structure, the magnetic fluctuations, and the Fermi surface is emphasized, calling for dedicated band structure calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.01321v1-abstract-full').style.display = 'none'; document.getElementById('1611.01321v1-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, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">22 pages, 4 Figures + supplementary information (3 pages, 1 table)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat. Commun. 7, 13075 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.08805">arXiv:1609.08805</a> <span> [<a href="https://arxiv.org/pdf/1609.08805">pdf</a>, <a href="https://arxiv.org/format/1609.08805">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.95.014428">10.1103/PhysRevB.95.014428 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Field driven magnetostructural transitions in GeCo$_2$O$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fabr%C3%A8ges%2C+X">X. Fabr猫ges</a>, <a href="/search/cond-mat?searchtype=author&query=Ressouche%2C+E">E. Ressouche</a>, <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">F. Duc</a>, <a href="/search/cond-mat?searchtype=author&query=de+Brion%2C+S">S. de Brion</a>, <a href="/search/cond-mat?searchtype=author&query=Amara%2C+M">M. Amara</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Paolasini%2C+L">L. Paolasini</a>, <a href="/search/cond-mat?searchtype=author&query=Suard%2C+E">E. Suard</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Canals%2C+B">B. Canals</a>, <a href="/search/cond-mat?searchtype=author&query=Strobel%2C+P">P. Strobel</a>, <a href="/search/cond-mat?searchtype=author&query=Simonet%2C+V">V. Simonet</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="1609.08805v2-abstract-short" style="display: inline;"> In the spinel compound GeCo$_2$O$_4$, the Co$^{2+}$ pyrochlore sublattice presents remarkable magnetic field-induced behaviors that we unveil through neutron and X-ray single-crystal diffraction. The N茅el ordered magnetic phase is entered through a structural lowering of the cubic symmetry. In this phase, when a magnetic field is applied along a 2-fold cubic direction, a spin-flop transition of on… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.08805v2-abstract-full').style.display = 'inline'; document.getElementById('1609.08805v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.08805v2-abstract-full" style="display: none;"> In the spinel compound GeCo$_2$O$_4$, the Co$^{2+}$ pyrochlore sublattice presents remarkable magnetic field-induced behaviors that we unveil through neutron and X-ray single-crystal diffraction. The N茅el ordered magnetic phase is entered through a structural lowering of the cubic symmetry. In this phase, when a magnetic field is applied along a 2-fold cubic direction, a spin-flop transition of one fourth of the magnetic moments releases the magnetic frustration and triggers magnetostructural effects. At high field, these ultimately lead to an unusual spin reorientation associated to structural changes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.08805v2-abstract-full').style.display = 'none'; document.getElementById('1609.08805v2-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 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 95, 014428 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1506.06491">arXiv:1506.06491</a> <span> [<a href="https://arxiv.org/pdf/1506.06491">pdf</a>, <a href="https://arxiv.org/format/1506.06491">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.93.214419">10.1103/PhysRevB.93.214419 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Helical bunching and symmetry lowering inducing multiferroicity in Fe langasites </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chaix%2C+L">Laura Chaix</a>, <a href="/search/cond-mat?searchtype=author&query=Ballou%2C+R">Rafik Ballou</a>, <a href="/search/cond-mat?searchtype=author&query=Cano%2C+A">Andres Cano</a>, <a href="/search/cond-mat?searchtype=author&query=Petit%2C+S">Sylvain Petit</a>, <a href="/search/cond-mat?searchtype=author&query=De+Brion%2C+S">Sophie De Brion</a>, <a href="/search/cond-mat?searchtype=author&query=Ollivier%2C+J">Jacques Ollivier</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Ressouche%2C+E">Eric Ressouche</a>, <a href="/search/cond-mat?searchtype=author&query=Constable%2C+E">Evan Constable</a>, <a href="/search/cond-mat?searchtype=author&query=Colin%2C+C">Claire Colin</a>, <a href="/search/cond-mat?searchtype=author&query=Zorko%2C+A">A. Zorko</a>, <a href="/search/cond-mat?searchtype=author&query=Scagnoli%2C+V">Valerio Scagnoli</a>, <a href="/search/cond-mat?searchtype=author&query=Balay%2C+J">Jo毛l Balay</a>, <a href="/search/cond-mat?searchtype=author&query=Lejay%2C+P">Pascal Lejay</a>, <a href="/search/cond-mat?searchtype=author&query=Simonet%2C+V">Virginie Simonet</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="1506.06491v2-abstract-short" style="display: inline;"> The chiral Fe-based langasites represent model systems of triangle-based frustrated magnets with a strong potential for multiferroicity. We report neutron scattering measurements for the multichiral Ba3MFe3Si2O14 (M = Nb, Ta) langasites revealing new important features of the magnetic order of these systems: the bunching of the helical modulation along the c-axis and the in-plane distortion of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.06491v2-abstract-full').style.display = 'inline'; document.getElementById('1506.06491v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1506.06491v2-abstract-full" style="display: none;"> The chiral Fe-based langasites represent model systems of triangle-based frustrated magnets with a strong potential for multiferroicity. We report neutron scattering measurements for the multichiral Ba3MFe3Si2O14 (M = Nb, Ta) langasites revealing new important features of the magnetic order of these systems: the bunching of the helical modulation along the c-axis and the in-plane distortion of the 120{\textdegree} Fe-spin arrangement. We discuss these subtle features in terms of the microscopic spin Hamiltonian, and provide the link to the magnetically-induced electric polarization observed in these systems. Thus, our findings put the multiferroicity of this attractive family of materials on solid ground. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.06491v2-abstract-full').style.display = 'none'; document.getElementById('1506.06491v2-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2015. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1504.04590">arXiv:1504.04590</a> <span> [<a href="https://arxiv.org/pdf/1504.04590">pdf</a>, <a href="https://arxiv.org/format/1504.04590">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.92.014412">10.1103/PhysRevB.92.014412 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Finite-temperature scaling of spin correlations in an experimental realization of the one-dimensional Ising quantum critical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=H%C3%A4lg%2C+M">M. H盲lg</a>, <a href="/search/cond-mat?searchtype=author&query=H%C3%BCvonen%2C+D">D. H眉vonen</a>, <a href="/search/cond-mat?searchtype=author&query=Guidi%2C+T">T. Guidi</a>, <a href="/search/cond-mat?searchtype=author&query=Quintero-Castro%2C+D+L">D. L. Quintero-Castro</a>, <a href="/search/cond-mat?searchtype=author&query=Boehm%2C+M">M. Boehm</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Hagiwara%2C+M">M. Hagiwara</a>, <a href="/search/cond-mat?searchtype=author&query=Zheludev%2C+A">A. Zheludev</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="1504.04590v2-abstract-short" style="display: inline;"> Inelastic neutron scattering is used to study the finite-temperature scaling behavior of the local dynamic structure factor in the quasi-one-dimensional quantum antiferromagnet NTENP ($\text{Ni(N,N'-bis(3-aminopropyl)propane-1,3-diamine)(}渭\text{-NO}_2\text{)ClO}_4$), at its field-induced Ising quantum critical point. The validity and the limitations of the theoretically predicted scaling relation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.04590v2-abstract-full').style.display = 'inline'; document.getElementById('1504.04590v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1504.04590v2-abstract-full" style="display: none;"> Inelastic neutron scattering is used to study the finite-temperature scaling behavior of the local dynamic structure factor in the quasi-one-dimensional quantum antiferromagnet NTENP ($\text{Ni(N,N'-bis(3-aminopropyl)propane-1,3-diamine)(}渭\text{-NO}_2\text{)ClO}_4$), at its field-induced Ising quantum critical point. The validity and the limitations of the theoretically predicted scaling relations are tested. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.04590v2-abstract-full').style.display = 'none'; document.getElementById('1504.04590v2-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> 23 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 April, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 92, 014412 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1503.08102">arXiv:1503.08102</a> <span> [<a href="https://arxiv.org/pdf/1503.08102">pdf</a>, <a href="https://arxiv.org/format/1503.08102">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.92.024101">10.1103/PhysRevB.92.024101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Crystal structure and phonon softening in Ca3Ir4Sn13 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mazzone%2C+D+G">D. G. Mazzone</a>, <a href="/search/cond-mat?searchtype=author&query=Gerber%2C+S">S. Gerber</a>, <a href="/search/cond-mat?searchtype=author&query=Gavilano%2C+J+L">J. L. Gavilano</a>, <a href="/search/cond-mat?searchtype=author&query=Sibille%2C+R">R. Sibille</a>, <a href="/search/cond-mat?searchtype=author&query=Medarde%2C+M">M. Medarde</a>, <a href="/search/cond-mat?searchtype=author&query=Delley%2C+B">B. Delley</a>, <a href="/search/cond-mat?searchtype=author&query=Ramakrishnan%2C+M">M. Ramakrishnan</a>, <a href="/search/cond-mat?searchtype=author&query=Neugebauer%2C+M">M. Neugebauer</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Chernyshov%2C+D">D. Chernyshov</a>, <a href="/search/cond-mat?searchtype=author&query=Piovano%2C+A">A. Piovano</a>, <a href="/search/cond-mat?searchtype=author&query=Fernandez-Diaz%2C+T+M">T. M. Fernandez-Diaz</a>, <a href="/search/cond-mat?searchtype=author&query=Keller%2C+L">L. Keller</a>, <a href="/search/cond-mat?searchtype=author&query=Cervellino%2C+A">A. Cervellino</a>, <a href="/search/cond-mat?searchtype=author&query=Pomjakushina%2C+E">E. Pomjakushina</a>, <a href="/search/cond-mat?searchtype=author&query=Conder%2C+K">K. Conder</a>, <a href="/search/cond-mat?searchtype=author&query=Kenzelmann%2C+M">M. Kenzelmann</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="1503.08102v2-abstract-short" style="display: inline;"> We investigated the crystal structure and lattice excitations of the ternary intermetallic stannide Ca3Ir4Sn13 using neutron and x-ray scattering techniques. For T > T* ~ 38 K the x-ray diffraction data can be satisfactorily refined using the space group Pm-3n. Below T* the crystal structure is modulated with a propagation vector of q = (1/2, 1/2, 0). This may arise from a merohedral twinning in w… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.08102v2-abstract-full').style.display = 'inline'; document.getElementById('1503.08102v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1503.08102v2-abstract-full" style="display: none;"> We investigated the crystal structure and lattice excitations of the ternary intermetallic stannide Ca3Ir4Sn13 using neutron and x-ray scattering techniques. For T > T* ~ 38 K the x-ray diffraction data can be satisfactorily refined using the space group Pm-3n. Below T* the crystal structure is modulated with a propagation vector of q = (1/2, 1/2, 0). This may arise from a merohedral twinning in which three tetragonal domains overlap to mimic a higher symmetry, or from a doubling of the cubic unit cell. Neutron diffraction and neutron spectroscopy results show that the structural transition at T* is of a second-order, and that it is well described by mean-field theory. Inelastic neutron scattering data point towards a displacive structural transition at T* arising from the softening of a low-energy phonon mode with an energy gap of Delta(120 K) = 1.05 meV. Using density functional theory the soft phonon mode is identified as a 'breathing' mode of the Sn12 icosahedra and is consistent with the thermal ellipsoids of the Sn2 atoms found by single crystal diffraction data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.08102v2-abstract-full').style.display = 'none'; document.getElementById('1503.08102v2-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 July, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 92, 024101 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1502.00773">arXiv:1502.00773</a> <span> [<a href="https://arxiv.org/pdf/1502.00773">pdf</a>, <a href="https://arxiv.org/format/1502.00773">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> <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/srep07968">10.1038/srep07968 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Distinct itinerant spin-density waves and local-moment antiferromagnetism in an intermetallic ErPd$_2$Si$_2$ single crystal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">Hai-Feng Li</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+C">Chongde Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Wildes%2C+A">Andrew Wildes</a>, <a href="/search/cond-mat?searchtype=author&query=Schmidt%2C+W">Wolfgang Schmidt</a>, <a href="/search/cond-mat?searchtype=author&query=Schmalzl%2C+K">Karin Schmalzl</a>, <a href="/search/cond-mat?searchtype=author&query=Hou%2C+B">Binyang Hou</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Cong Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Meuffels%2C+P">Paul Meuffels</a>, <a href="/search/cond-mat?searchtype=author&query=L%C3%B6ser%2C+W">Wolfgang L枚ser</a>, <a href="/search/cond-mat?searchtype=author&query=Roth%2C+G">Georg Roth</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="1502.00773v1-abstract-short" style="display: inline;"> Identifying the nature of magnetism, itinerant or localized, remains a major challenge in condensed-matter science. Purely localized moments appear only in magnetic insulators, whereas itinerant moments more or less co-exist with localized moments in metallic compounds such as the doped-cuprate or the iron-based superconductors, hampering a thorough understanding of the role of magnetism in phenom… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.00773v1-abstract-full').style.display = 'inline'; document.getElementById('1502.00773v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1502.00773v1-abstract-full" style="display: none;"> Identifying the nature of magnetism, itinerant or localized, remains a major challenge in condensed-matter science. Purely localized moments appear only in magnetic insulators, whereas itinerant moments more or less co-exist with localized moments in metallic compounds such as the doped-cuprate or the iron-based superconductors, hampering a thorough understanding of the role of magnetism in phenomena like superconductivity or magnetoresistance. Here we distinguish two antiferromagnetic modulations with respective propagation wave vectors of $Q_{\pm}$ = ($H \pm 0.557(1)$, 0, $L \pm 0.150(1)$) and $Q_\text{C}$ = ($H \pm 0.564(1)$, 0, $L$), where $\left(H, L\right)$ are allowed Miller indices, in an ErPd$_2$Si$_2$ single crystal by neutron scattering and establish their respective temperature- and field-dependent phase diagrams. The modulations can co-exist but also compete depending on temperature or applied field strength. They couple differently with the underlying lattice albeit with associated moments in a common direction. The $Q_{\pm}$ modulation may be attributed to localized 4\emph{f} moments while the $Q_\text{C}$ correlates well with itinerant conduction bands, supported by our transport studies. Hence, ErPd$_2$Si$_2$ represents a new model compound that displays clearly-separated itinerant and localized moments, substantiating early theoretical predictions and providing a unique platform allowing the study of itinerant electron behavior in a localized antiferromagnetic matrix. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.00773v1-abstract-full').style.display = 'none'; document.getElementById('1502.00773v1-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> 3 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">7 pages, 7 Figures, 1 Table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Scientific Reports 5, Article number: 7968, Pages: 1-7, 2015 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1410.3101">arXiv:1410.3101</a> <span> [<a href="https://arxiv.org/pdf/1410.3101">pdf</a>, <a href="https://arxiv.org/format/1410.3101">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.91.035129">10.1103/PhysRevB.91.035129 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Lattice dynamics of the heavy fermion compound URu$_2$Si$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Buhot%2C+J">J. Buhot</a>, <a href="/search/cond-mat?searchtype=author&query=M%C3%A9asson%2C+M+A">M. A. M茅asson</a>, <a href="/search/cond-mat?searchtype=author&query=Gallais%2C+Y">Y. Gallais</a>, <a href="/search/cond-mat?searchtype=author&query=Cazayous%2C+M">M. Cazayous</a>, <a href="/search/cond-mat?searchtype=author&query=Sacuto%2C+A">A. Sacuto</a>, <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">F. Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Raymond%2C+S">S. Raymond</a>, <a href="/search/cond-mat?searchtype=author&query=Lapertot%2C+G">G. Lapertot</a>, <a href="/search/cond-mat?searchtype=author&query=Aoki%2C+D">D. Aoki</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Ivanov%2C+A">A. Ivanov</a>, <a href="/search/cond-mat?searchtype=author&query=Piekarz%2C+P">P. Piekarz</a>, <a href="/search/cond-mat?searchtype=author&query=Parlinski%2C+K">K. Parlinski</a>, <a href="/search/cond-mat?searchtype=author&query=Legut%2C+D">D. Legut</a>, <a href="/search/cond-mat?searchtype=author&query=Homes%2C+C+C">C. C. Homes</a>, <a href="/search/cond-mat?searchtype=author&query=Lejay%2C+P">P. Lejay</a>, <a href="/search/cond-mat?searchtype=author&query=Lobo%2C+R+P+S+M">R. P. S. M. Lobo</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="1410.3101v1-abstract-short" style="display: inline;"> We report a comprehensive investigation of the lattice dynamics of URu$_2$Si$_2$ as a function of temperature using Raman scattering, optical conductivity and inelastic neutron scattering measurements as well as theoretical {\it ab initio} calculations. The main effects on the optical phonon modes are related to Kondo physics. The B$_{1g}$ ($螕_3$ symmetry) phonon mode slightly softens below… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.3101v1-abstract-full').style.display = 'inline'; document.getElementById('1410.3101v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1410.3101v1-abstract-full" style="display: none;"> We report a comprehensive investigation of the lattice dynamics of URu$_2$Si$_2$ as a function of temperature using Raman scattering, optical conductivity and inelastic neutron scattering measurements as well as theoretical {\it ab initio} calculations. The main effects on the optical phonon modes are related to Kondo physics. The B$_{1g}$ ($螕_3$ symmetry) phonon mode slightly softens below $\sim$100~K, in connection with the previously reported softening of the elastic constant, $C_{11}-C_{12}$, of the same symmetry, both observations suggesting a B$_{1g}$ symmetry-breaking instability in the Kondo regime. Through optical conductivity, we detect clear signatures of strong electron-phonon coupling, with temperature dependent spectral weight and Fano line shape of some phonon modes. Surprisingly, the line shapes of two phonon modes, E$_u$(1) and A$_{2u}$(2), show opposite temperature dependencies. The A$_{2u}$(2) mode loses its Fano shape below 150 K, whereas the E$_u$(1) mode acquires it below 100~K, in the Kondo cross-over regime. This may point out to momentum-dependent Kondo physics. By inelastic neutron scattering measurements, we have drawn the full dispersion of the phonon modes between 300~K and 2~K. No remarkable temperature dependence has been obtained including through the hidden order transition. {\it Ab initio} calculations with the spin-orbit coupling are in good agreement with the data except for a few low energy branches with propagation in the (a,b) plane. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.3101v1-abstract-full').style.display = 'none'; document.getElementById('1410.3101v1-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, 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">Journal ref:</span> Phys. Rev. B 91, 035129 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.6416">arXiv:1409.6416</a> <span> [<a href="https://arxiv.org/pdf/1409.6416">pdf</a>, <a href="https://arxiv.org/format/1409.6416">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.90.140502">10.1103/PhysRevB.90.140502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chenglin Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu Song</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Y">Yixi Su</a>, <a href="/search/cond-mat?searchtype=author&query=Enderle%2C+M">M. Enderle</a>, <a href="/search/cond-mat?searchtype=author&query=Kulda%2C+J">J. Kulda</a>, <a href="/search/cond-mat?searchtype=author&query=Tan%2C+G">Guotai Tan</a>, <a href="/search/cond-mat?searchtype=author&query=Sims%2C+Z+C">Zachary C. Sims</a>, <a href="/search/cond-mat?searchtype=author&query=Egami%2C+T">Takeshi Egami</a>, <a href="/search/cond-mat?searchtype=author&query=Si%2C+Q">Qimiao Si</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="1409.6416v1-abstract-short" style="display: inline;"> We use polarized inelastic neutron scattering (INS) to study spin excitations in superconducting NaFe0.985Co0.015As (C15) with static antiferromagnetic (AF) order along the a-axis of the orthorhombic structure and NaFe0.935Co0.045As (C45) without AF order. In previous unpolarized INS work, spin excitations in C15 were found to have a dispersive sharp resonance near Er1=3.25 meV and a broad dispers… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.6416v1-abstract-full').style.display = 'inline'; document.getElementById('1409.6416v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.6416v1-abstract-full" style="display: none;"> We use polarized inelastic neutron scattering (INS) to study spin excitations in superconducting NaFe0.985Co0.015As (C15) with static antiferromagnetic (AF) order along the a-axis of the orthorhombic structure and NaFe0.935Co0.045As (C45) without AF order. In previous unpolarized INS work, spin excitations in C15 were found to have a dispersive sharp resonance near Er1=3.25 meV and a broad dispersionless mode at Er2=6 meV. Our neutron polarization analysis reveals that the dispersive resonance in C15 is highly anisotropic and polarized along the a- and c-axis, while the dispersionless mode is isotropic similar to that of C45. Since the a-axis polarized spin excitations of the anisotropic resonance appear below Tc, our data suggests that the itinerant electrons contributing to the magnetism are also coupled to the superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.6416v1-abstract-full').style.display = 'none'; document.getElementById('1409.6416v1-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> 23 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">PRB(R), 2014</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1407.4349">arXiv:1407.4349</a> <span> [<a href="https://arxiv.org/pdf/1407.4349">pdf</a>, <a href="https://arxiv.org/format/1407.4349">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/10.1080/14786435.2014.935513">10.1080/14786435.2014.935513 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Neutron scattering studies on URu2Si2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">Frederic Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Raymond%2C+S">Stephane Raymond</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</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="1407.4349v1-abstract-short" style="display: inline;"> This paper is aiming to review some of the neutron scattering studies performed on URu2Si2 in Grenoble. This compound has been studied for a quarter of century because of a so-called hidden order ground state visible by most of the bulk experiments but almost invisible by microscopic probes like neutrons, muons NMR or x-ray. We stress on some aspects that were not addressed previously. Firstly, th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.4349v1-abstract-full').style.display = 'inline'; document.getElementById('1407.4349v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1407.4349v1-abstract-full" style="display: none;"> This paper is aiming to review some of the neutron scattering studies performed on URu2Si2 in Grenoble. This compound has been studied for a quarter of century because of a so-called hidden order ground state visible by most of the bulk experiments but almost invisible by microscopic probes like neutrons, muons NMR or x-ray. We stress on some aspects that were not addressed previously. Firstly, the comparison of the cell parameters in the 1-2-2 systems seems to point that the magnetic properties of URu2Si2 are leading by an U4+ electronic state. Secondly, a compilation of the different studies of the tiny antiferromagnetic moment indicates that the tiny antiferromagnetic moment has a constant value which may indicate that it is not necessary extrinsic. We also present the last development on the magnetic form factor measurement in which the magnetic density rotates when entering in the hidden order state. To end, the thermal dependence of the two most intense magnetic excitation at Q0=(1,0,0) and Q1=(0.6,0,0) seems to indicate two different origins or processes for these excitations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.4349v1-abstract-full').style.display = 'none'; document.getElementById('1407.4349v1-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 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">18 pages, 18 figures, published in Philosophical Magazine, 2014</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1407.0568">arXiv:1407.0568</a> <span> [<a href="https://arxiv.org/pdf/1407.0568">pdf</a>, <a href="https://arxiv.org/format/1407.0568">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.90.024509">10.1103/PhysRevB.90.024509 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Short-range cluster spin glass near optimal superconductivity in BaFe$_{2-x}$Ni$_{x}$As$_{2}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lu%2C+X">Xingye Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Tam%2C+D+W">David W. Tam</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chenglin Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+H">Huiqian Luo</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M">Meng Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+R">Rui Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Harriger%2C+L+W">Leland W. Harriger</a>, <a href="/search/cond-mat?searchtype=author&query=Keller%2C+T">T. Keller</a>, <a href="/search/cond-mat?searchtype=author&query=Keimer%2C+B">B. Keimer</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Maier%2C+T+A">Thomas A. Maier</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="1407.0568v1-abstract-short" style="display: inline;"> High-temperature superconductivity in iron pnictides occurs when electrons are doped into their antiferromagnetic (AF) parent compounds. In addition to inducing superconductivity, electron-doping also changes the static commensurate AF order in the undoped parent compounds into short-range incommensurate AF order near optimal superconductivity. Here we use neutron scattering to demonstrate that th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.0568v1-abstract-full').style.display = 'inline'; document.getElementById('1407.0568v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1407.0568v1-abstract-full" style="display: none;"> High-temperature superconductivity in iron pnictides occurs when electrons are doped into their antiferromagnetic (AF) parent compounds. In addition to inducing superconductivity, electron-doping also changes the static commensurate AF order in the undoped parent compounds into short-range incommensurate AF order near optimal superconductivity. Here we use neutron scattering to demonstrate that the incommensurate AF order in BaFe$_{2-x}$Ni$_{x}$As$_{2}$ is not a spin-density-wave arising from the itinerant electrons in nested Fermi surfaces, but consistent with a cluster spin glass in the matrix of the superconducting phase. Therefore, optimal superconductivity in iron pnictides coexists and competes with a mesoscopically separated cluster spin glass phase, much different from the homogeneous coexisting AF and superconducting phases in the underdoped regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.0568v1-abstract-full').style.display = 'none'; document.getElementById('1407.0568v1-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 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">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 90, 024509 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1407.0213">arXiv:1407.0213</a> <span> [<a href="https://arxiv.org/pdf/1407.0213">pdf</a>, <a href="https://arxiv.org/format/1407.0213">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.114.017201">10.1103/PhysRevLett.114.017201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Longitudinal and Transverse Zeeman Ladders in the Ising-Like Chain Antiferromagnet BaCo2V2O8 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Grenier%2C+B">B. Grenier</a>, <a href="/search/cond-mat?searchtype=author&query=Petit%2C+S">S. Petit</a>, <a href="/search/cond-mat?searchtype=author&query=Simonet%2C+V">V. Simonet</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Can%C3%A9vet%2C+E">E. Can茅vet</a>, <a href="/search/cond-mat?searchtype=author&query=Raymond%2C+S">S. Raymond</a>, <a href="/search/cond-mat?searchtype=author&query=Canals%2C+B">B. Canals</a>, <a href="/search/cond-mat?searchtype=author&query=Berthier%2C+C">C. Berthier</a>, <a href="/search/cond-mat?searchtype=author&query=Lejay%2C+P">P. Lejay</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="1407.0213v3-abstract-short" style="display: inline;"> We explore the spin dynamics emerging from the N茅el phase of the chain compound antiferromagnet BaCo2V2O8. Our inelastic neutron scattering study reveals unconventional discrete spin excitations, so called Zeeman ladders, understood in terms of spinon confinement, due to the interchain attractive linear potential. These excitations consist in two interlaced series of modes, respectively with trans… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.0213v3-abstract-full').style.display = 'inline'; document.getElementById('1407.0213v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1407.0213v3-abstract-full" style="display: none;"> We explore the spin dynamics emerging from the N茅el phase of the chain compound antiferromagnet BaCo2V2O8. Our inelastic neutron scattering study reveals unconventional discrete spin excitations, so called Zeeman ladders, understood in terms of spinon confinement, due to the interchain attractive linear potential. These excitations consist in two interlaced series of modes, respectively with transverse and longitudinal polarization. The latter have no classical counterpart and are related to the zero-point fluctuations that weaken the ordered moment in weakly coupled quantum chains. Our analysis reveals that BaCo2V2O8, with moderate Ising anisotropy and sizable interchain interactions, remarkably fulfills the conditions necessary for the observation of these longitudinal excitations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.0213v3-abstract-full').style.display = 'none'; document.getElementById('1407.0213v3-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 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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, 2 additional pages of supplemental material with 2 figures; Journal ref. added; 1 page erratum added at the end with 1 figure</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 114, 017201 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1404.2890">arXiv:1404.2890</a> <span> [<a href="https://arxiv.org/pdf/1404.2890">pdf</a>, <a href="https://arxiv.org/ps/1404.2890">ps</a>, <a href="https://arxiv.org/format/1404.2890">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.105.097202">10.1103/PhysRevLett.105.097202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Macroscopic Quantum Coherence of the Spin Triplet in the Spin-Ladder Compound Sr14Cu24O41 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lorenzo%2C+E">Emilio Lorenzo</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Boullier%2C+C">Cyrille Boullier</a>, <a href="/search/cond-mat?searchtype=author&query=Martin%2C+N">Nicolas Martin</a>, <a href="/search/cond-mat?searchtype=author&query=Moudden%2C+A+H">A. H. Moudden</a>, <a href="/search/cond-mat?searchtype=author&query=Vanishri%2C+S">S. Vanishri</a>, <a href="/search/cond-mat?searchtype=author&query=Marin%2C+C">Christophe Marin</a>, <a href="/search/cond-mat?searchtype=author&query=Revcolevschi%2C+A">A. Revcolevschi</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="1404.2890v1-abstract-short" style="display: inline;"> We report the direct observation by inelastic neutron scattering experiments of a spin triplet of magnetic excitations in the response associated with the ladders in the composite cuprate Sr14Cu24O41. This appears as a peak at q_{Q1D}=蟺and energy 螖_1=32.5 meV, and we conjecture that all the triplets making up this conspicuous peak have the same phase and therefore interpret it as the signature of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.2890v1-abstract-full').style.display = 'inline'; document.getElementById('1404.2890v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1404.2890v1-abstract-full" style="display: none;"> We report the direct observation by inelastic neutron scattering experiments of a spin triplet of magnetic excitations in the response associated with the ladders in the composite cuprate Sr14Cu24O41. This appears as a peak at q_{Q1D}=蟺and energy 螖_1=32.5 meV, and we conjecture that all the triplets making up this conspicuous peak have the same phase and therefore interpret it as the signature of the occurrence of quantum coherence along the ladder direction between entangled spin pairs. From the comparison with previous neutron and x-ray data, we conclude that the temperature evolution of this mode is driven by the crystallization of holes into a charge density wave in the ladder sublattice <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.2890v1-abstract-full').style.display = 'none'; document.getElementById('1404.2890v1-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 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters 105 (2010) 097202 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1402.7018">arXiv:1402.7018</a> <span> [<a href="https://arxiv.org/pdf/1402.7018">pdf</a>, <a href="https://arxiv.org/format/1402.7018">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.112.137201">10.1103/PhysRevLett.112.137201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magneto- to electro-active transmutation of spin waves in ErMnO3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chaix%2C+L">Laura Chaix</a>, <a href="/search/cond-mat?searchtype=author&query=De+Brion%2C+S">Sophie De Brion</a>, <a href="/search/cond-mat?searchtype=author&query=Petit%2C+S">Sylvain Petit</a>, <a href="/search/cond-mat?searchtype=author&query=Ballou%2C+R">Rafik Ballou</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Ollivier%2C+J">Jacques Ollivier</a>, <a href="/search/cond-mat?searchtype=author&query=Brubach%2C+J">Jean-Blaise Brubach</a>, <a href="/search/cond-mat?searchtype=author&query=Roy%2C+P">Pascale Roy</a>, <a href="/search/cond-mat?searchtype=author&query=Debray%2C+J">J茅r么me Debray</a>, <a href="/search/cond-mat?searchtype=author&query=Lejay%2C+P">Pascal Lejay</a>, <a href="/search/cond-mat?searchtype=author&query=Cano%2C+A">Andres Cano</a>, <a href="/search/cond-mat?searchtype=author&query=Ressouche%2C+E">Eric Ressouche</a>, <a href="/search/cond-mat?searchtype=author&query=Simonet%2C+V">Virginie Simonet</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="1402.7018v1-abstract-short" style="display: inline;"> The low energy dynamical properties of the multiferroic hexagonal perovskite ErMnO3 have been studied by inelastic neutron scattering as well as terahertz and far infrared spectroscopies on synchrotron source. From these complementary techniques, we have determined the magnon and crystal field spectra and identified a zone center magnon only excitable by the electric field of an electromagnetic wa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1402.7018v1-abstract-full').style.display = 'inline'; document.getElementById('1402.7018v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1402.7018v1-abstract-full" style="display: none;"> The low energy dynamical properties of the multiferroic hexagonal perovskite ErMnO3 have been studied by inelastic neutron scattering as well as terahertz and far infrared spectroscopies on synchrotron source. From these complementary techniques, we have determined the magnon and crystal field spectra and identified a zone center magnon only excitable by the electric field of an electromagnetic wave. Using comparison with the isostructural YMnO3 compound and crystal field calculations, we propose that this dynamical magnetoelectric process is due to the hybridization of a magnon with an electro-active crystal field transition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1402.7018v1-abstract-full').style.display = 'none'; document.getElementById('1402.7018v1-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 February, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters 112, 13 (2014) 137201 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1401.8130">arXiv:1401.8130</a> <span> [<a href="https://arxiv.org/pdf/1401.8130">pdf</a>, <a href="https://arxiv.org/format/1401.8130">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.89.144406">10.1103/PhysRevB.89.144406 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Kinetics of the Multiferroic Switching in MnWO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Baum%2C+M">M. Baum</a>, <a href="/search/cond-mat?searchtype=author&query=Leist%2C+J">J. Leist</a>, <a href="/search/cond-mat?searchtype=author&query=Finger%2C+T">Th. Finger</a>, <a href="/search/cond-mat?searchtype=author&query=Schmalzl%2C+K">K. Schmalzl</a>, <a href="/search/cond-mat?searchtype=author&query=Hiess%2C+A">A. Hiess</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Becker%2C+P">P. Becker</a>, <a href="/search/cond-mat?searchtype=author&query=Bohaty%2C+L">L. Bohaty</a>, <a href="/search/cond-mat?searchtype=author&query=Eckold%2C+G">G. Eckold</a>, <a href="/search/cond-mat?searchtype=author&query=Braden%2C+M">M. Braden</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="1401.8130v1-abstract-short" style="display: inline;"> The time dependence of switching multiferroic domains in MnWO$_4$ has been studied by time-resolved polarized neutron diffraction. Inverting an external electric field inverts the chiral magnetic component within rise times ranging between a few and some tens of milliseconds in perfect agreement with macroscopic techniques. There is no evidence for any faster process in the inversion of the chiral… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1401.8130v1-abstract-full').style.display = 'inline'; document.getElementById('1401.8130v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1401.8130v1-abstract-full" style="display: none;"> The time dependence of switching multiferroic domains in MnWO$_4$ has been studied by time-resolved polarized neutron diffraction. Inverting an external electric field inverts the chiral magnetic component within rise times ranging between a few and some tens of milliseconds in perfect agreement with macroscopic techniques. There is no evidence for any faster process in the inversion of the chiral magnetic structure. The time dependence is well described by a temperature-dependent rise time suggesting a well-defined process of domain reversion. As expected, the rise times decrease when heating towards the upper boundary of the ferroelectric phase. However, switching also becomes faster upon cooling towards the lower boundary, which is associated with a first-order phase transition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1401.8130v1-abstract-full').style.display = 'none'; document.getElementById('1401.8130v1-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 January, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2014. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1312.5113">arXiv:1312.5113</a> <span> [<a href="https://arxiv.org/pdf/1312.5113">pdf</a>, <a href="https://arxiv.org/ps/1312.5113">ps</a>, <a href="https://arxiv.org/format/1312.5113">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.84.104409">10.1103/PhysRevB.84.104409 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multipolar, magnetic and vibrational lattice dynamics in the low temperature phase of uranium dioxide </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Caciuffo%2C+R">R. Caciuffo</a>, <a href="/search/cond-mat?searchtype=author&query=Santini%2C+P">P. Santini</a>, <a href="/search/cond-mat?searchtype=author&query=Carretta%2C+S">S. Carretta</a>, <a href="/search/cond-mat?searchtype=author&query=Amoretti%2C+G">G. Amoretti</a>, <a href="/search/cond-mat?searchtype=author&query=Hiess%2C+A">A. Hiess</a>, <a href="/search/cond-mat?searchtype=author&query=Magnani%2C+N">N. Magnani</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Lander%2C+G+H">G. H. Lander</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="1312.5113v1-abstract-short" style="display: inline;"> We report the results of inelastic neutron scattering experiments performed with triple-axis spectrometers to investigate the low-temperature collective dynamics in the ordered phase of uranium dioxide. The results are in excellent agreement with the predictions of mean-field RPA calculations emphasizing the importance of multipolar superexchange interactions. By comparing neutron scattering inten… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.5113v1-abstract-full').style.display = 'inline'; document.getElementById('1312.5113v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1312.5113v1-abstract-full" style="display: none;"> We report the results of inelastic neutron scattering experiments performed with triple-axis spectrometers to investigate the low-temperature collective dynamics in the ordered phase of uranium dioxide. The results are in excellent agreement with the predictions of mean-field RPA calculations emphasizing the importance of multipolar superexchange interactions. By comparing neutron scattering intensities in different polarization channels and at equivalent points in different Brillouin zones, we show the mixed magneto-vibrational-quadrupolar character of the observed excitations. The high energy resolution afforded by the cold triple-axis spectrometer allowed us to study in detail the magnon-phonon interaction giving rise to avoided crossings along the $[00尉]$ reciprocal space direction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.5113v1-abstract-full').style.display = 'none'; document.getElementById('1312.5113v1-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 December, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 84, 104409 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1310.1143">arXiv:1310.1143</a> <span> [<a href="https://arxiv.org/pdf/1310.1143">pdf</a>, <a href="https://arxiv.org/ps/1310.1143">ps</a>, <a href="https://arxiv.org/format/1310.1143">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.88.134512">10.1103/PhysRevB.88.134512 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-plane spin excitation anisotropy in the paramagnetic phase of NaFeAs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu Song</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chenglin Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Tan%2C+G">Guotai Tan</a>, <a href="/search/cond-mat?searchtype=author&query=Carr%2C+S+V">Scott V. Carr</a>, <a href="/search/cond-mat?searchtype=author&query=Chi%2C+S">Songxue Chi</a>, <a href="/search/cond-mat?searchtype=author&query=Christianson%2C+A+D">A. D. Christianson</a>, <a href="/search/cond-mat?searchtype=author&query=Xiang%2C+T">Tao Xiang</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="1310.1143v1-abstract-short" style="display: inline;"> We use unpolarized and polarized inelastic neutron scattering to study low-energy spin excitations in NaFeAs, which exhibits a tetragonal-to-orthorhombic lattice distortion at $T_s\approx 58$ K followed by a collinear antiferromagnetic (AF) order below $T_N\approx 45$ K. In the AF ordered state ($T<T_N$), spin waves are entirely c-axis polarized below $\sim$10 meV, exhibiting a gap of $\sim4$ meV… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.1143v1-abstract-full').style.display = 'inline'; document.getElementById('1310.1143v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1310.1143v1-abstract-full" style="display: none;"> We use unpolarized and polarized inelastic neutron scattering to study low-energy spin excitations in NaFeAs, which exhibits a tetragonal-to-orthorhombic lattice distortion at $T_s\approx 58$ K followed by a collinear antiferromagnetic (AF) order below $T_N\approx 45$ K. In the AF ordered state ($T<T_N$), spin waves are entirely c-axis polarized below $\sim$10 meV, exhibiting a gap of $\sim4$ meV at the AF zone center and disperse to $\sim$7 meV near the c-axis AF zone boundary. On warming to the paramagnetic state with orthorhombic lattice distortion ($T_N<T<T_s$), spin excitations become anisotropic within the FeAs plane. Upon further warming to the paramagnetic tetragonal state ($T>T_s$), spin excitations become more isotropic. Since similar magnetic anisotropy is also observed in the paramagnetic tetragonal phase of superconducting BaFe$_{1.904}$Ni$_{0.096}$As$_2$, our results suggest that the spin excitation anisotropy in superconducting iron pnictides originates from similar anisotropy already present in their parent compounds. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.1143v1-abstract-full').style.display = 'none'; document.getElementById('1310.1143v1-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> 3 October, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">7 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 88, 134512 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1309.7553">arXiv:1309.7553</a> <span> [<a href="https://arxiv.org/pdf/1309.7553">pdf</a>, <a href="https://arxiv.org/ps/1309.7553">ps</a>, <a href="https://arxiv.org/format/1309.7553">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Longitudinal spin excitations and magnetic anisotropy in antiferromagnetically ordered BaFe2As2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+C">Chong Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+R">Rui Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+F">Fa Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+H">Huiqian Luo</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yuan Li</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="1309.7553v1-abstract-short" style="display: inline;"> We report on a spin-polarized inelastic neutron scattering study of spin waves in the antiferromagnetically ordered state of BaFe2As2. Three distinct excitation components are identified, with spins fluctuating along the c-axis, perpendicular to the ordering direction in the ab-plane, and parallel to the ordering direction. While the first two "transverse" components can be described by a linear s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.7553v1-abstract-full').style.display = 'inline'; document.getElementById('1309.7553v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1309.7553v1-abstract-full" style="display: none;"> We report on a spin-polarized inelastic neutron scattering study of spin waves in the antiferromagnetically ordered state of BaFe2As2. Three distinct excitation components are identified, with spins fluctuating along the c-axis, perpendicular to the ordering direction in the ab-plane, and parallel to the ordering direction. While the first two "transverse" components can be described by a linear spin-wave theory with magnetic anisotropy and inter-layer coupling, the third "longitudinal" component is generically incompatible with the local moment picture. It points towards a contribution of itinerant electrons to the magnetism already in the parent compound of this family of Fe-based superconductors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.7553v1-abstract-full').style.display = 'none'; document.getElementById('1309.7553v1-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> 29 September, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">4 pages, 4 figures, plus 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. X 3, 041036 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1308.3858">arXiv:1308.3858</a> <span> [<a href="https://arxiv.org/pdf/1308.3858">pdf</a>, <a href="https://arxiv.org/ps/1308.3858">ps</a>, <a href="https://arxiv.org/format/1308.3858">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> <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/10.1103/PhysRevLett.111.107006">10.1103/PhysRevLett.111.107006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin excitation anisotropy as a probe of orbital ordering in the paramagnetic tetragonal phase of superconducting BaFe1.904Ni0.096As2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Luo%2C+H">Huiqian Luo</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M">Meng Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chenglin Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+R">Rui Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+S">Shiliang Li</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+J">Jiangping Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="1308.3858v1-abstract-short" style="display: inline;"> We use polarized neutron scattering to demonstrate that in-plane spin excitations in electron doped superconducting BaFe1.904Ni0.096As2 (Tc=19.8 K) change from isotropic to anisotropic in the tetragonal phase well above the antiferromagnetic (AF) ordering and tetragonal-to-orthorhombic lattice distortion temperatures (Tn=Ts=33 K) without an uniaxial pressure. While the anisotropic spin excitations… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.3858v1-abstract-full').style.display = 'inline'; document.getElementById('1308.3858v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1308.3858v1-abstract-full" style="display: none;"> We use polarized neutron scattering to demonstrate that in-plane spin excitations in electron doped superconducting BaFe1.904Ni0.096As2 (Tc=19.8 K) change from isotropic to anisotropic in the tetragonal phase well above the antiferromagnetic (AF) ordering and tetragonal-to-orthorhombic lattice distortion temperatures (Tn=Ts=33 K) without an uniaxial pressure. While the anisotropic spin excitations are not sensitive to the AF order and tetragonal-to-orthorhombic lattice distortion, superconductivity induces further anisotropy for spin excitations along the [1,1,0] and [1,-1,0] directions. These results indicate that the spin excitation anisotropy is a probe of the electronic anisotropy or orbital ordering in the tetragonal phase of iron pnictides. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.3858v1-abstract-full').style.display = 'none'; document.getElementById('1308.3858v1-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 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">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 6 figures, with supplementary materials</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 111, 107006 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.6009">arXiv:1301.6009</a> <span> [<a href="https://arxiv.org/pdf/1301.6009">pdf</a>, <a href="https://arxiv.org/ps/1301.6009">ps</a>, <a href="https://arxiv.org/format/1301.6009">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.87.064421">10.1103/PhysRevB.87.064421 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unexpected phase locking of magnetic fluctuations in the multi-k magnet USb </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lim%2C+J+A">J. A. Lim</a>, <a href="/search/cond-mat?searchtype=author&query=Blackburn%2C+E">E. Blackburn</a>, <a href="/search/cond-mat?searchtype=author&query=Magnani%2C+N">N. Magnani</a>, <a href="/search/cond-mat?searchtype=author&query=Hiess%2C+A">A. Hiess</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Caciuffo%2C+R">R. Caciuffo</a>, <a href="/search/cond-mat?searchtype=author&query=Lander%2C+G+H">G. H. Lander</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="1301.6009v1-abstract-short" style="display: inline;"> The spin waves in the multi-k antiferromagnet, USb, soften and become quasielastic well below the AFM ordering temperature, T_N. This occurs without a magnetic or structural transition. It has been suggested that this change is in fact due to de-phasing of the different multi-k components: a switch from 3-k to 1-k behaviour. In this work, we use inelastic neutron scattering with tri-directional po… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.6009v1-abstract-full').style.display = 'inline'; document.getElementById('1301.6009v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.6009v1-abstract-full" style="display: none;"> The spin waves in the multi-k antiferromagnet, USb, soften and become quasielastic well below the AFM ordering temperature, T_N. This occurs without a magnetic or structural transition. It has been suggested that this change is in fact due to de-phasing of the different multi-k components: a switch from 3-k to 1-k behaviour. In this work, we use inelastic neutron scattering with tri-directional polarisation analysis to probe the quasielastic magnetic excitations and reveal that the 3-k structure does not de-phase. More surprisingly, the paramagnetic correlations also maintain the same clear phase correlations well above T_N (up to at least 1.4T_N). This precursor regime has not been observed before in a multi-k system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.6009v1-abstract-full').style.display = 'none'; document.getElementById('1301.6009v1-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 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2013. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.1397">arXiv:1301.1397</a> <span> [<a href="https://arxiv.org/pdf/1301.1397">pdf</a>, <a href="https://arxiv.org/ps/1301.1397">ps</a>, <a href="https://arxiv.org/format/1301.1397">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.87.081101">10.1103/PhysRevB.87.081101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic anisotropy in hole-doped superconducting Ba 0.67K 0.33Fe 2As2 probed by polarized inelastic neutron scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chenglin Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=liu%2C+m">mengshu liu</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Y">Yixi Su</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M">Meng Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Tan%2C+G">Guotai Tan</a>, <a href="/search/cond-mat?searchtype=author&query=Bruckel%2C+T">Th. Bruckel</a>, <a href="/search/cond-mat?searchtype=author&query=Egami%2C+T">Takeshi Egami</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="1301.1397v1-abstract-short" style="display: inline;"> We use polarized inelastic neutron scattering (INS) to study spin excitations of optimally hole-doped superconductor Ba$_{0.67}$K$_{0.33}$Fe$_2$As$_{2}$ ($T_c=38$ K). In the normal state, the imaginary part of the dynamic susceptibility, $蠂^{\prime\prime}(Q,蠅)$, shows magnetic anisotropy for energies below $\sim$7 meV with c-axis polarized spin excitations larger than that of the in-plane compon… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.1397v1-abstract-full').style.display = 'inline'; document.getElementById('1301.1397v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.1397v1-abstract-full" style="display: none;"> We use polarized inelastic neutron scattering (INS) to study spin excitations of optimally hole-doped superconductor Ba$_{0.67}$K$_{0.33}$Fe$_2$As$_{2}$ ($T_c=38$ K). In the normal state, the imaginary part of the dynamic susceptibility, $蠂^{\prime\prime}(Q,蠅)$, shows magnetic anisotropy for energies below $\sim$7 meV with c-axis polarized spin excitations larger than that of the in-plane component. Upon entering into the superconducting state, previous unpolarized INS experiments have shown that spin gaps at $\sim$5 and 0.75 meV open at wave vectors $Q=(0.5,0.5,0)$ and $(0.5,0.5,1)$, respectively, with a broad neutron spin resonance at $E_r=15$ meV. Our neutron polarization analysis reveals that the large difference in spin gaps is purely due to different spin gaps in the c-axis and in-plane polarized spin excitations, resulting resonance with different energy widths for the c-axis and in-plane spin excitations. The observation of spin anisotropy in both opitmally electron and hole-doped BaFe$_2$As$_2$ is due to their proximity to the AF ordered BaFe$_2$As$_2$ where spin anisotropy exists below $T_N$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.1397v1-abstract-full').style.display = 'none'; document.getElementById('1301.1397v1-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, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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, 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 B 87, 081101(R) (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1206.4690">arXiv:1206.4690</a> <span> [<a href="https://arxiv.org/pdf/1206.4690">pdf</a>, <a href="https://arxiv.org/format/1206.4690">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.109.097201">10.1103/PhysRevLett.109.097201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Lifetime of Gapped Excitations in a Collinear Quantum Antiferromagnet </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chernyshev%2C+A+L">A. L. Chernyshev</a>, <a href="/search/cond-mat?searchtype=author&query=Zhitomirsky%2C+M+E">M. E. Zhitomirsky</a>, <a href="/search/cond-mat?searchtype=author&query=Martin%2C+N">N. Martin</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</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="1206.4690v2-abstract-short" style="display: inline;"> We demonstrate that local modulations of magnetic couplings have a profound effect on the temperature dependence of the relaxation rate of optical magnons in a wide class of antiferromagnets in which gapped excitations coexist with acoustic spin waves. In a two-dimensional collinear antiferromagnet with an easy-plane anisotropy, the disorder-induced relaxation rate of the gapped mode, Gamma_imp=Ga… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.4690v2-abstract-full').style.display = 'inline'; document.getElementById('1206.4690v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1206.4690v2-abstract-full" style="display: none;"> We demonstrate that local modulations of magnetic couplings have a profound effect on the temperature dependence of the relaxation rate of optical magnons in a wide class of antiferromagnets in which gapped excitations coexist with acoustic spin waves. In a two-dimensional collinear antiferromagnet with an easy-plane anisotropy, the disorder-induced relaxation rate of the gapped mode, Gamma_imp=Gamma_0+A(TlnT)^2, greatly exceeds the magnon-magnon damping, Gamma_m-m=BT^5, negligible at low temperatures. We measure the lifetime of gapped magnons in a prototype XY antiferromagnet BaNi2(PO4)2 using a high-resolution neutron-resonance spin-echo technique and find experimental data in close accord with the theoretical prediction. Similarly strong effects of disorder in the three-dimensional case and in noncollinear antiferromagnets are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.4690v2-abstract-full').style.display = 'none'; document.getElementById('1206.4690v2-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 August, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 June, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">4.5 pages + 2.5 pages supplementary material, published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 109, 097201 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1110.5157">arXiv:1110.5157</a> <span> [<a href="https://arxiv.org/pdf/1110.5157">pdf</a>, <a href="https://arxiv.org/ps/1110.5157">ps</a>, <a href="https://arxiv.org/format/1110.5157">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 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.84.184430">10.1103/PhysRevB.84.184430 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of the magnetic properties of URu2Si2 under uniaxial stress by neutron scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">Frederic Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Martin%2C+N">Nicolas Martin</a>, <a href="/search/cond-mat?searchtype=author&query=Raymond%2C+S">Stephane Raymond</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Aoki%2C+D">Dai Aoki</a>, <a href="/search/cond-mat?searchtype=author&query=Taufour%2C+V">Valentin Taufour</a>, <a href="/search/cond-mat?searchtype=author&query=Flouquet%2C+J">Jacques Flouquet</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="1110.5157v1-abstract-short" style="display: inline;"> The aim of this study is to compare the magnetic behavior of URu2Si2 under uniaxial stress along the a-axis with the behavior under hydrostatic pressure. Both are very similar, but uniaxial stress presents a critical stress 蟽xa smaller (0.33(5)GPa) than the hydrostatic critical pressure px =0.5 GPa where the ground state switches from HO (hidden order) to AF (antiferromagnetic) ground state. From… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1110.5157v1-abstract-full').style.display = 'inline'; document.getElementById('1110.5157v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1110.5157v1-abstract-full" style="display: none;"> The aim of this study is to compare the magnetic behavior of URu2Si2 under uniaxial stress along the a-axis with the behavior under hydrostatic pressure. Both are very similar, but uniaxial stress presents a critical stress 蟽xa smaller (0.33(5)GPa) than the hydrostatic critical pressure px =0.5 GPa where the ground state switches from HO (hidden order) to AF (antiferromagnetic) ground state. From these critical values and from Larmor neutron diffraction (LND), we conclude that the magnetic properties are governed by the shortest U-U distance in the plane (a lattice parameter). Under stress, the orthorhombic unit cell stays centered. A key point shown by this study is the presence of a threshold for the uniaxial stress along the a-axis before the appearance of the large AF moment which indicates no-mixture of order parameter (OP) between the HO ground state and the AF one as under hydrostatic pressure. The two most intense longitudinal magnetic excitations at Q0=(1,0,0) and Q1=(0.6,0,0) were measured in the HO state: the excitation at Q0 decreases in energy while the excitation at Q1 increases in energy with the uniaxial stress along the a-axis. The decrease of the energy of the excitation at Q0 seems to indicate a critical energy gap value of 1.2(1) meV at 蟽xa. A similar value was derived from studies under hydrostatic pressure at px. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1110.5157v1-abstract-full').style.display = 'none'; document.getElementById('1110.5157v1-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, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">22 pages, 10 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> Physical Review B 84, 184430 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1105.4923">arXiv:1105.4923</a> <span> [<a href="https://arxiv.org/pdf/1105.4923">pdf</a>, <a href="https://arxiv.org/ps/1105.4923">ps</a>, <a href="https://arxiv.org/format/1105.4923">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.84.024518">10.1103/PhysRevB.84.024518 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-plane magnetic field effect on the neutron spin resonance in optimally doped FeSe$_{0.4}$Te$_{0.6}$ and BaFe$_{1.9}$Ni$_{0.1}$As$_{2}$ superconductors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+S">Shiliang Li</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+X">Xingye Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M">Meng Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+H">Hui-qian Luo</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M">Miaoyin Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chenglin Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Faulhaber%2C+E">Enrico Faulhaber</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+D">Deepak Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="1105.4923v2-abstract-short" style="display: inline;"> We use inelastic neutron scattering to study the effect of an in-plane magnetic field on the magnetic resonance in optimally doped superconductors FeSe$_{0.4}$Te$_{0.6}$ ($T_c=14$ K) and BaFe$_{1.9}$Ni$_{0.1}$As$_{2}$ ($T_c=20$ K). While the magnetic field up to 14.5 Tesla does not change the energy of the resonance, it particially suppresses $T_c$ and the corresponding superconductivity-induced i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.4923v2-abstract-full').style.display = 'inline'; document.getElementById('1105.4923v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1105.4923v2-abstract-full" style="display: none;"> We use inelastic neutron scattering to study the effect of an in-plane magnetic field on the magnetic resonance in optimally doped superconductors FeSe$_{0.4}$Te$_{0.6}$ ($T_c=14$ K) and BaFe$_{1.9}$Ni$_{0.1}$As$_{2}$ ($T_c=20$ K). While the magnetic field up to 14.5 Tesla does not change the energy of the resonance, it particially suppresses $T_c$ and the corresponding superconductivity-induced intensity gain of the mode. However, we find no direct evidence for the field-induced spin-1 Zeeman splitting of the resonance. Therefore, it is still unclear if the resonance is the long-sought singlet-triplet excitation directly coupled to the superconducting electron Cooper pairs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.4923v2-abstract-full').style.display = 'none'; document.getElementById('1105.4923v2-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 May, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 May, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">5 pages, 4 figures, The first two wrong figures are corrected</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 84, 024518 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1010.6204">arXiv:1010.6204</a> <span> [<a href="https://arxiv.org/pdf/1010.6204">pdf</a>, <a href="https://arxiv.org/ps/1010.6204">ps</a>, <a href="https://arxiv.org/format/1010.6204">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.83.180506">10.1103/PhysRevB.83.180506 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin anisotropy of the resonance in superconducting FeSe0.5Te0.5 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Babkevich%2C+P">P. Babkevich</a>, <a href="/search/cond-mat?searchtype=author&query=Roessli%2C+B">B. Roessli</a>, <a href="/search/cond-mat?searchtype=author&query=Gvasaliya%2C+S+N">S. N. Gvasaliya</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Freeman%2C+P+G">P. G. Freeman</a>, <a href="/search/cond-mat?searchtype=author&query=Pomjakushina%2C+E">E. Pomjakushina</a>, <a href="/search/cond-mat?searchtype=author&query=Conder%2C+K">K. Conder</a>, <a href="/search/cond-mat?searchtype=author&query=Boothroyd%2C+A+T">A. T. Boothroyd</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="1010.6204v2-abstract-short" style="display: inline;"> We have used polarized-neutron inelastic scattering to resolve the spin fluctuations in superconducting FeSe0.5Te0.5 into components parallel and perpendicular to the layers. A spin resonance at an energy of 6.5 meV is observed to develop below T_c in both fluctuation components. The resonance peak is anisotropic, with the in-plane component slightly larger than the out-of-plane component. Away fr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1010.6204v2-abstract-full').style.display = 'inline'; document.getElementById('1010.6204v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1010.6204v2-abstract-full" style="display: none;"> We have used polarized-neutron inelastic scattering to resolve the spin fluctuations in superconducting FeSe0.5Te0.5 into components parallel and perpendicular to the layers. A spin resonance at an energy of 6.5 meV is observed to develop below T_c in both fluctuation components. The resonance peak is anisotropic, with the in-plane component slightly larger than the out-of-plane component. Away from the resonance peak the magnetic fluctuations are isotropic in the energy range studied. The results are consistent with a dominant singlet pairing state with s^{\pm} symmetry, with a possible minority component of different symmetry. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1010.6204v2-abstract-full').style.display = 'none'; document.getElementById('1010.6204v2-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, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 October, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">5 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 83, 180506(R) (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1010.5476">arXiv:1010.5476</a> <span> [<a href="https://arxiv.org/pdf/1010.5476">pdf</a>, <a href="https://arxiv.org/ps/1010.5476">ps</a>, <a href="https://arxiv.org/format/1010.5476">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="Other Condensed Matter">cond-mat.other</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</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.106.187202">10.1103/PhysRevLett.106.187202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Rods of Neutron Scattering Intensity in Yb2Ti2O7: Compelling Evidence for Significant Anisotropic Exchange in a Magnetic Pyrochlore Oxide </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Thompson%2C+J+D">Jordan D. Thompson</a>, <a href="/search/cond-mat?searchtype=author&query=McClarty%2C+P+A">Paul A. McClarty</a>, <a href="/search/cond-mat?searchtype=author&query=Ronnow%2C+H+M">Henrik M. Ronnow</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">Louis P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Sorge%2C+A">Andreas Sorge</a>, <a href="/search/cond-mat?searchtype=author&query=Gingras%2C+M+J+P">Michel J. P. Gingras</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="1010.5476v2-abstract-short" style="display: inline;"> Paramagnetic correlations in the magnetic material Yb2Ti2O7 have been investigated via neutron scattering, revealing a [111] rod of scattering intensity. Assuming interactions between the Yb^{3+} ions composed of all symmetry-allowed nearest neighbor exchange interactions and long-range dipolar interactions, we construct a model Hamiltonian that allows for an excellent description of the neutron s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1010.5476v2-abstract-full').style.display = 'inline'; document.getElementById('1010.5476v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1010.5476v2-abstract-full" style="display: none;"> Paramagnetic correlations in the magnetic material Yb2Ti2O7 have been investigated via neutron scattering, revealing a [111] rod of scattering intensity. Assuming interactions between the Yb^{3+} ions composed of all symmetry-allowed nearest neighbor exchange interactions and long-range dipolar interactions, we construct a model Hamiltonian that allows for an excellent description of the neutron scattering data. Our results provide compelling evidence for significant anisotropic exchange interactions in an insulating magnetic pyrochlore oxide. We also compute the real space correlations leading to the [111] rod of scattering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1010.5476v2-abstract-full').style.display = 'none'; document.getElementById('1010.5476v2-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 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 October, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">10 pages, 4 figures. Supplemental material and body of paper combined together in 1 file</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 106, 187202 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1010.1230">arXiv:1010.1230</a> <span> [<a href="https://arxiv.org/pdf/1010.1230">pdf</a>, <a href="https://arxiv.org/ps/1010.1230">ps</a>, <a href="https://arxiv.org/format/1010.1230">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.83.052401">10.1103/PhysRevB.83.052401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dynamics of the two-dimensional S=1/2 dimer system (C5H6N2F)2CuCl4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hong%2C+T">Tao Hong</a>, <a href="/search/cond-mat?searchtype=author&query=Gvasaliya%2C+S+N">S. N. Gvasaliya</a>, <a href="/search/cond-mat?searchtype=author&query=Herringer%2C+S">S. Herringer</a>, <a href="/search/cond-mat?searchtype=author&query=Turnbull%2C+M+M">M. M. Turnbull</a>, <a href="/search/cond-mat?searchtype=author&query=Landee%2C+C+P">C. P. Landee</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Boehm%2C+M">M. Boehm</a>, <a href="/search/cond-mat?searchtype=author&query=Zheludev%2C+A">A. Zheludev</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="1010.1230v2-abstract-short" style="display: inline;"> Inelastic neutron scattering was used to study a quantum S=1/2 antiferromagnetic Heisenberg system-Bis(2-amino-5-fluoropyridinium) Tetrachlorocuprate(II). The magnetic excitation spectrum was shown to be dominated by long-lived excitations with an energy gap as 1.07(3) meV. The measured dispersion relation is consistent with a simple two-dimensional square lattice of weakly-coupled spin dimers. Co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1010.1230v2-abstract-full').style.display = 'inline'; document.getElementById('1010.1230v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1010.1230v2-abstract-full" style="display: none;"> Inelastic neutron scattering was used to study a quantum S=1/2 antiferromagnetic Heisenberg system-Bis(2-amino-5-fluoropyridinium) Tetrachlorocuprate(II). The magnetic excitation spectrum was shown to be dominated by long-lived excitations with an energy gap as 1.07(3) meV. The measured dispersion relation is consistent with a simple two-dimensional square lattice of weakly-coupled spin dimers. Comparing the data to a random phase approximation treatment of this model gives the intra-dimer and inter-dimer exchange constants J=1.45(2) meV and J'=0.31(3) meV, respectively. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1010.1230v2-abstract-full').style.display = 'none'; document.getElementById('1010.1230v2-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 October, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 October, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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, 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 83, 052401 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1004.1899">arXiv:1004.1899</a> <span> [<a href="https://arxiv.org/pdf/1004.1899">pdf</a>, <a href="https://arxiv.org/ps/1004.1899">ps</a>, <a href="https://arxiv.org/format/1004.1899">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 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/10.1143/JPSJ.79.064719">10.1143/JPSJ.79.064719 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Precise study of the resonance at Q0=(1,0,0) in URu2Si2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bourdarot%2C+F">Frederic Bourdarot</a>, <a href="/search/cond-mat?searchtype=author&query=Hassinger%2C+E">Elena Hassinger</a>, <a href="/search/cond-mat?searchtype=author&query=Raymond%2C+S">Stephane Raymond</a>, <a href="/search/cond-mat?searchtype=author&query=Aoki%2C+D">Dai Aoki</a>, <a href="/search/cond-mat?searchtype=author&query=Taufour%2C+V">Valentin Taufour</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Flouquet%2C+J">Jacques Flouquet</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="1004.1899v1-abstract-short" style="display: inline;"> New inelastic neutron scattering experiments have been performed on URu2Si2 with special focus on the response at Q0=(1,0,0), which is a clear signature of the hidden order (HO) phase of the compound. With polarized inelastic neutron experiments, it is clearly shown that below the HO temperature (T0 = 17.8 K) a collective excitation (the magnetic resonance at E0 \approx 1.7 meV) as well as a magne… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1004.1899v1-abstract-full').style.display = 'inline'; document.getElementById('1004.1899v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1004.1899v1-abstract-full" style="display: none;"> New inelastic neutron scattering experiments have been performed on URu2Si2 with special focus on the response at Q0=(1,0,0), which is a clear signature of the hidden order (HO) phase of the compound. With polarized inelastic neutron experiments, it is clearly shown that below the HO temperature (T0 = 17.8 K) a collective excitation (the magnetic resonance at E0 \approx 1.7 meV) as well as a magnetic continuum co-exist. Careful measurements of the temperature dependence of the resonance lead to the observation that its position shifts abruptly in temperature with an activation law governed by the partial gap opening and that its integrated intensity has a BCS-type temperature dependence. Discussion with respect to recent theoretical development is made. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1004.1899v1-abstract-full').style.display = 'none'; document.getElementById('1004.1899v1-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 April, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. Soc. Jpn. 79 (2010) 064719 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0909.4964">arXiv:0909.4964</a> <span> [<a href="https://arxiv.org/pdf/0909.4964">pdf</a>, <a href="https://arxiv.org/ps/0909.4964">ps</a>, <a href="https://arxiv.org/format/0909.4964">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.80.134414">10.1103/PhysRevB.80.134414 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic order and dynamics of the charge-ordered antiferromagnet La1.5Sr0.5CoO4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Helme%2C+L+M">L. M. Helme</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=Coldea%2C+R">R. Coldea</a>, <a href="/search/cond-mat?searchtype=author&query=Prabhakaran%2C+D">D. Prabhakaran</a>, <a href="/search/cond-mat?searchtype=author&query=Frost%2C+C+D">C. D. Frost</a>, <a href="/search/cond-mat?searchtype=author&query=Keen%2C+D+A">D. A. Keen</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Freeman%2C+P+G">P. G. Freeman</a>, <a href="/search/cond-mat?searchtype=author&query=Enderle%2C+M">M. Enderle</a>, <a href="/search/cond-mat?searchtype=author&query=Kulda%2C+J">J. Kulda</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="0909.4964v1-abstract-short" style="display: inline;"> We describe neutron scattering experiments performed to investigate the magnetic order and dynamics of half-doped La1.5Sr0.5CoO4. This layered perovskite exhibits a near-ideal checkerboard pattern of Co2+/Co3+ charge order at temperatures below ~ 800 K. Magnetic correlations are observed at temperatures below ~ 60 K but static magnetic order only becomes established at 31 K, a temperature at whi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.4964v1-abstract-full').style.display = 'inline'; document.getElementById('0909.4964v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0909.4964v1-abstract-full" style="display: none;"> We describe neutron scattering experiments performed to investigate the magnetic order and dynamics of half-doped La1.5Sr0.5CoO4. This layered perovskite exhibits a near-ideal checkerboard pattern of Co2+/Co3+ charge order at temperatures below ~ 800 K. Magnetic correlations are observed at temperatures below ~ 60 K but static magnetic order only becomes established at 31 K, a temperature at which a kink is observed in the susceptibility. On warming above 31 K we observed a change in the magnetic correlations which we attribute either to a spin canting or to a change in the proportion of inequivalent magnetic domains. The magnetic excitation spectrum is dominated by an intense band extending above a gap of approximately 3 meV up to a maximum energy of 16 meV. A weaker band exists in the energy range 20-30 meV. We show that the excitation spectrum is in excellent quantitative agreement with the predictions of a spin-wave theory generalized to include the full magnetic degrees of freedom of high-spin Co2+ ions in an axially distorted crystal field, coupled by Heisenberg exchange interactions. The magnetic order is found to be stabilized by dominant antiferromagnetic Co2+ -- Co2+ interactions acting in a straight line through Co3+. No evidence is found for magnetic scattering from the Co3+ ions, supporting the view that Co3+ is in the S = 0 state in this material. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.4964v1-abstract-full').style.display = 'none'; document.getElementById('0909.4964v1-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> 28 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">17 pages, 10 figures. Accepted for publication in Phys. Rev. B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 80, 134414 (2009) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0909.3355">arXiv:0909.3355</a> <span> [<a href="https://arxiv.org/pdf/0909.3355">pdf</a>, <a href="https://arxiv.org/ps/0909.3355">ps</a>, <a href="https://arxiv.org/format/0909.3355">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.80.214413">10.1103/PhysRevB.80.214413 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Excitations from a chiral magnetized state of a frustrated quantum spin liquid </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zheludev%2C+A">A. Zheludev</a>, <a href="/search/cond-mat?searchtype=author&query=Garlea%2C+V+O">V. O. Garlea</a>, <a href="/search/cond-mat?searchtype=author&query=Tsvelik%2C+A">A. Tsvelik</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Habicht%2C+K">K. Habicht</a>, <a href="/search/cond-mat?searchtype=author&query=Kiefer%2C+K">K. Kiefer</a>, <a href="/search/cond-mat?searchtype=author&query=Roessli%2C+B">B. Roessli</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="0909.3355v1-abstract-short" style="display: inline;"> We study excitations in weakly interacting pairs of quantum spin ladders coupled through geometrically frustrated bonds. The ground state is a disordered spin liquid, that at high fields is replaced by an ordered chiral helimagnetic phase. The spectra observed by high-field inelastic neutron scattering experiments on the prototype compound Sul-Cu2Cl4 are qualitatively different from those in the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.3355v1-abstract-full').style.display = 'inline'; document.getElementById('0909.3355v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0909.3355v1-abstract-full" style="display: none;"> We study excitations in weakly interacting pairs of quantum spin ladders coupled through geometrically frustrated bonds. The ground state is a disordered spin liquid, that at high fields is replaced by an ordered chiral helimagnetic phase. The spectra observed by high-field inelastic neutron scattering experiments on the prototype compound Sul-Cu2Cl4 are qualitatively different from those in the previously studied frustration-free spin liquids. Beyond the critical field Hc=3.7 T, the soft mode that drives the quantum phase transition spawns two separate excitations: a gapless Goldstone mode and a massive magnon. Additional massive quasiparticles are clearly visible below Hc, but are destroyed in the ordered phase. In their place one observes a sharply bound excitation continuum. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.3355v1-abstract-full').style.display = 'none'; document.getElementById('0909.3355v1-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 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">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/0909.1496">arXiv:0909.1496</a> <span> [<a href="https://arxiv.org/pdf/0909.1496">pdf</a>, <a href="https://arxiv.org/ps/0909.1496">ps</a>, <a href="https://arxiv.org/format/0909.1496">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.81.060410">10.1103/PhysRevB.81.060410 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence of a magnetic Bose glass in IPA-Cu(Cl0.95Br0.05)3 from neutron diffraction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hong%2C+T">Tao Hong</a>, <a href="/search/cond-mat?searchtype=author&query=Zheludev%2C+A">A. Zheludev</a>, <a href="/search/cond-mat?searchtype=author&query=Manaka%2C+H">H. Manaka</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</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="0909.1496v2-abstract-short" style="display: inline;"> We report the single crystal study of the bulk magnetization and neutron scattering measurements on a quantum S=1/2 spin ladders system IPA-Cu(Cl0.95Br0.05)3with quenched disorder. In zero field, the disordered spin liquid phase is preserved as in pure IPA-CuCl3. Due to the bond randomness, a different Bose glass phase was directly observed in Hc<H<H', which separates the spin liquid phase from… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.1496v2-abstract-full').style.display = 'inline'; document.getElementById('0909.1496v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0909.1496v2-abstract-full" style="display: none;"> We report the single crystal study of the bulk magnetization and neutron scattering measurements on a quantum S=1/2 spin ladders system IPA-Cu(Cl0.95Br0.05)3with quenched disorder. In zero field, the disordered spin liquid phase is preserved as in pure IPA-CuCl3. Due to the bond randomness, a different Bose glass phase was directly observed in Hc<H<H', which separates the spin liquid phase from the unconventional Bose-Einstein condensation phase. The observed finite value of boson compressibility dM/dH and lack of field-induced three-dimensional long range order are consistent with the theoretical prediction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0909.1496v2-abstract-full').style.display = 'none'; document.getElementById('0909.1496v2-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, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 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">4 pages, 3 figures; to appear in PRB-RC</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 81, 060410(R) (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0908.0954">arXiv:0908.0954</a> <span> [<a href="https://arxiv.org/pdf/0908.0954">pdf</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> <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/10.1103/PhysRevB.81.180505">10.1103/PhysRevB.81.180505 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Resonance as a probe of the electron superconducting gap in BaFe1.9Ni0.1As2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+J">Jun Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L">Louis-Pierre Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chenglin Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M">Miaoying Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Z">Zhengcai Li</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+F">Fang Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+Z">Zhongxian Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</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="0908.0954v1-abstract-short" style="display: inline;"> The discovery of high-transition temperature (high-Tc) superconductivity near antiferromagnetism in iron arsenides raised the possibility of an unconventional superconducting mechansim1-8. The observation of clear Fermi surfaces and nodeless superconducting gaps by angle resolved photoemission9-12 suggests that electron pairing in these materials may be mediated by quasiparticle excitations betw… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0908.0954v1-abstract-full').style.display = 'inline'; document.getElementById('0908.0954v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0908.0954v1-abstract-full" style="display: none;"> The discovery of high-transition temperature (high-Tc) superconductivity near antiferromagnetism in iron arsenides raised the possibility of an unconventional superconducting mechansim1-8. The observation of clear Fermi surfaces and nodeless superconducting gaps by angle resolved photoemission9-12 suggests that electron pairing in these materials may be mediated by quasiparticle excitations between sign reversed hole and electron Fermi pockets5-8. Although the presence of a 'resonance' in the spin excitation spectrum found by inelastic neutron scattering13-17 is consistent with this picture18-20, there has been no direct evidence connecting the resonance to the superconducting gap energy. Here we show that for the optimally electron doped BaFe1.9Ni0.1As2 (Tc =20 K, Fig. 1c) iron arsenide superconductor, application of a magnetic field that suppresses the superconductivity and superconducting gap energy also reduces the intensity and energy of the resonance. These results suggest that the energy of the resonance is proportional to the electron pairing energy, and thus indicate that spin fluctuations are intimately related to the mechanism of superconductivity in iron arsenides. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0908.0954v1-abstract-full').style.display = 'none'; document.getElementById('0908.0954v1-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 August, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">19 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 81, 180505 (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0907.5319">arXiv:0907.5319</a> <span> [<a href="https://arxiv.org/pdf/0907.5319">pdf</a>, <a href="https://arxiv.org/ps/0907.5319">ps</a>, <a href="https://arxiv.org/format/0907.5319">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"> Control of chiral magnetism in multiferroic MnWO4 through an electric field </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Finger%2C+T">T. Finger</a>, <a href="/search/cond-mat?searchtype=author&query=Senff%2C+D">D. Senff</a>, <a href="/search/cond-mat?searchtype=author&query=Schmalzl%2C+K">K. Schmalzl</a>, <a href="/search/cond-mat?searchtype=author&query=Schmidt%2C+W">W. Schmidt</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Becker%2C+P">P. Becker</a>, <a href="/search/cond-mat?searchtype=author&query=Bohaty%2C+L">L. Bohaty</a>, <a href="/search/cond-mat?searchtype=author&query=Braden%2C+M">M. Braden</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="0907.5319v1-abstract-short" style="display: inline;"> The chiral components in the magnetic order in multiferroic MnWO4 have been studied by neutron diffraction using spherical polarization analysis as a function of temperature and of external electric field. We show that sufficiently close to the ferroelectric transition it is possible to switch the chiral component by applying moderate electric fields at constant temperature. Full hysteresis cycl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.5319v1-abstract-full').style.display = 'inline'; document.getElementById('0907.5319v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0907.5319v1-abstract-full" style="display: none;"> The chiral components in the magnetic order in multiferroic MnWO4 have been studied by neutron diffraction using spherical polarization analysis as a function of temperature and of external electric field. We show that sufficiently close to the ferroelectric transition it is possible to switch the chiral component by applying moderate electric fields at constant temperature. Full hysteresis cycles can be observed which indicate strong pinning of the magnetic order. MnWO4, furthermore, exhibits a magnetoelectric memory effect across heating into the paramagnetic and paraelectric phase. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.5319v1-abstract-full').style.display = 'none'; document.getElementById('0907.5319v1-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 July, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2009. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0907.4835">arXiv:0907.4835</a> <span> [<a href="https://arxiv.org/pdf/0907.4835">pdf</a>, <a href="https://arxiv.org/ps/0907.4835">ps</a>, <a href="https://arxiv.org/format/0907.4835">other</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/10.1103/PhysRevLett.104.047201">10.1103/PhysRevLett.104.047201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Universal magnetic structure of the half-magnetization phase in Cr-based spinels </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Matsuda%2C+M">M. Matsuda</a>, <a href="/search/cond-mat?searchtype=author&query=Ohoyama%2C+K">K. Ohoyama</a>, <a href="/search/cond-mat?searchtype=author&query=Yoshii%2C+S">S. Yoshii</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">H. Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Frings%2C+P">P. Frings</a>, <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">F. Duc</a>, <a href="/search/cond-mat?searchtype=author&query=Vignolle%2C+B">B. Vignolle</a>, <a href="/search/cond-mat?searchtype=author&query=Rikken%2C+G+L+J+A">G. L. J. A. Rikken</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+-">S. -H. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Ueda%2C+H">H. Ueda</a>, <a href="/search/cond-mat?searchtype=author&query=Ueda%2C+Y">Y. Ueda</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="0907.4835v1-abstract-short" style="display: inline;"> Using an elastic neutron scattering technique under a pulsed magnetic field up to 30 T, we determined the magnetic structure in the half-magnetization plateau phase in the spinel CdCr$_2$O$_4$. The magnetic structure has a cubic $P4_3$32 symmetry, which is the same as that observed in HgCr$_2$O$_4$. This suggests that there is a universal field induced spin-lattice coupling mechanism at work in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.4835v1-abstract-full').style.display = 'inline'; document.getElementById('0907.4835v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0907.4835v1-abstract-full" style="display: none;"> Using an elastic neutron scattering technique under a pulsed magnetic field up to 30 T, we determined the magnetic structure in the half-magnetization plateau phase in the spinel CdCr$_2$O$_4$. The magnetic structure has a cubic $P4_3$32 symmetry, which is the same as that observed in HgCr$_2$O$_4$. This suggests that there is a universal field induced spin-lattice coupling mechanism at work in the Cr-based spinels. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.4835v1-abstract-full').style.display = 'none'; document.getElementById('0907.4835v1-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> 28 July, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0902.2802">arXiv:0902.2802</a> <span> [<a href="https://arxiv.org/pdf/0902.2802">pdf</a>, <a href="https://arxiv.org/format/0902.2802">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> <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/10.1038/NPHYS1360">10.1038/NPHYS1360 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Testing the itinerancy of spin dynamics in superconducting Bi2212 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Xu%2C+G">Guangyong Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+G+D">G. D. Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Hucker%2C+M">M. Hucker</a>, <a href="/search/cond-mat?searchtype=author&query=Fauque%2C+B">B. Fauque</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=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Tranquada%2C+J+M">J. M. Tranquada</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="0902.2802v2-abstract-short" style="display: inline;"> Much of what we know about the electronic states of high-temperature superconductors is due to photoemission and scanning tunneling spectroscopy studies of the compound Bi2212. The demonstration of well-defined quasiparticles in the superconducting state has encouraged many theorists to apply the conventional theory of metals, Fermi-liquid theory, to the cuprates. In particular, the spin excitat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0902.2802v2-abstract-full').style.display = 'inline'; document.getElementById('0902.2802v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0902.2802v2-abstract-full" style="display: none;"> Much of what we know about the electronic states of high-temperature superconductors is due to photoemission and scanning tunneling spectroscopy studies of the compound Bi2212. The demonstration of well-defined quasiparticles in the superconducting state has encouraged many theorists to apply the conventional theory of metals, Fermi-liquid theory, to the cuprates. In particular, the spin excitations observed by neutron scattering at energies below twice the superconducting gap energy are commonly believed to correspond to an excitonic state involving itinerant electrons. Here, we present the first measurements of the magnetic spectral weight of optimally-doped Bi2212 in absolute units. The lack of temperature dependence of the local spin susceptibility across the superconducting transition temperature, T_c, is incompatible with the itinerant calculations. Alternatively, the magnetic excitations could be due to local moments, as the magnetic spectrum is similar to that in LBCO where quasiparticles and local moments coexist. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0902.2802v2-abstract-full').style.display = 'none'; document.getElementById('0902.2802v2-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, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 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">6 pages; revised title, abstract, various improvements to the text</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat. Phys. 5, 642 (2009) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0811.2540">arXiv:0811.2540</a> <span> [<a href="https://arxiv.org/pdf/0811.2540">pdf</a>, <a href="https://arxiv.org/ps/0811.2540">ps</a>, <a href="https://arxiv.org/format/0811.2540">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> <p class="title is-5 mathjax"> Hybrid Goldstone modes in multiferroics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Pailhes%2C+S">S. Pailhes</a>, <a href="/search/cond-mat?searchtype=author&query=Fabreges%2C+X">X. Fabreges</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+P">L. P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Pinsard-Godart%2C+L">L. Pinsard-Godart</a>, <a href="/search/cond-mat?searchtype=author&query=Mirebeau%2C+I">I. Mirebeau</a>, <a href="/search/cond-mat?searchtype=author&query=Moussa%2C+F">F. Moussa</a>, <a href="/search/cond-mat?searchtype=author&query=Hennion%2C+M">M. Hennion</a>, <a href="/search/cond-mat?searchtype=author&query=Petit%2C+S">S. Petit</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="0811.2540v1-abstract-short" style="display: inline;"> By using polarized inelastic neutron scattering measurements, we show that the spin-lattice quantum entanglement in mutliferroics results in hybrid elementary excitations, involving spin and lattice degrees of freedom. These excitations can be considered as multiferroic Godstone modes. We argue that the Dzyaloshinskii-Moriya interaction could be at the origin of this hybridization. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0811.2540v1-abstract-full" style="display: none;"> By using polarized inelastic neutron scattering measurements, we show that the spin-lattice quantum entanglement in mutliferroics results in hybrid elementary excitations, involving spin and lattice degrees of freedom. These excitations can be considered as multiferroic Godstone modes. We argue that the Dzyaloshinskii-Moriya interaction could be at the origin of this hybridization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.2540v1-abstract-full').style.display = 'none'; document.getElementById('0811.2540v1-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 November, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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, 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/0807.1571">arXiv:0807.1571</a> <span> [<a href="https://arxiv.org/pdf/0807.1571">pdf</a>, <a href="https://arxiv.org/ps/0807.1571">ps</a>, <a href="https://arxiv.org/format/0807.1571">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.79.060404">10.1103/PhysRevB.79.060404 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dimensional crossover in a spin liquid to helimagnet quantum phase transition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Garlea%2C+V+O">V. O. Garlea</a>, <a href="/search/cond-mat?searchtype=author&query=Zheludev%2C+A">A. Zheludev</a>, <a href="/search/cond-mat?searchtype=author&query=Habicht%2C+K">K. Habicht</a>, <a href="/search/cond-mat?searchtype=author&query=Meissner%2C+M">M. Meissner</a>, <a href="/search/cond-mat?searchtype=author&query=Grenier%2C+B">B. Grenier</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Ressouche%2C+E">E. Ressouche</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="0807.1571v2-abstract-short" style="display: inline;"> Neutron scattering is used to study magnetic field induced ordering in the quasi-1D quantum spin-tube compound Sul--Cu$_2$Cl$_4$ that in zero field has a non-magnetic spin-liquid ground state. The experiments reveal an incommensurate chiral high-field phase stabilized by a geometric frustration of the magnetic interactions. The measured critical exponents $尾\approx0.235$ and $谓\approx0.34$ at… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.1571v2-abstract-full').style.display = 'inline'; document.getElementById('0807.1571v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0807.1571v2-abstract-full" style="display: none;"> Neutron scattering is used to study magnetic field induced ordering in the quasi-1D quantum spin-tube compound Sul--Cu$_2$Cl$_4$ that in zero field has a non-magnetic spin-liquid ground state. The experiments reveal an incommensurate chiral high-field phase stabilized by a geometric frustration of the magnetic interactions. The measured critical exponents $尾\approx0.235$ and $谓\approx0.34$ at $H_c\approx3.7$ T point to an unusual sub-critical scaling regime and may reflect the chiral nature of the quantum critical point. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.1571v2-abstract-full').style.display = 'none'; document.getElementById('0807.1571v2-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> 3 February, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 July, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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</span> </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" 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