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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.06650">arXiv:2403.06650</a> <span> [<a href="https://arxiv.org/pdf/2403.06650">pdf</a>, <a href="https://arxiv.org/format/2403.06650">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> <p class="title is-5 mathjax"> Magnetic signatures of multicomponent superconductivity in pressurized UTe2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Z">Zheyu Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+J">Jiasheng Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Weinberger%2C+T+I">Theodore. I. Weinberger</a>, <a href="/search/cond-mat?searchtype=author&query=Cabala%2C+A">Andrej Cabala</a>, <a href="/search/cond-mat?searchtype=author&query=Sechovsky%2C+V">Vladimir Sechovsky</a>, <a href="/search/cond-mat?searchtype=author&query=Valiska%2C+M">Michal Valiska</a>, <a href="/search/cond-mat?searchtype=author&query=Alireza%2C+P+L">Patricia L. Alireza</a>, <a href="/search/cond-mat?searchtype=author&query=Eaton%2C+A+G">Alexander G. Eaton</a>, <a href="/search/cond-mat?searchtype=author&query=Grosche%2C+F+M">F. Malte Grosche</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.06650v1-abstract-short" style="display: inline;"> The heavy fermion material UTe$_2$ possesses a rich phase diagram with multiple superconducting phases, several of which exhibit characteristics of odd-parity pairing. Here, we report on the pressure dependence of signatures of the superconducting transition in the temperature dependent ac magnetic susceptibility $蠂(T)$ in high quality UTe$_2$ single crystals. We resolve a single superconducting t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.06650v1-abstract-full').style.display = 'inline'; document.getElementById('2403.06650v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.06650v1-abstract-full" style="display: none;"> The heavy fermion material UTe$_2$ possesses a rich phase diagram with multiple superconducting phases, several of which exhibit characteristics of odd-parity pairing. Here, we report on the pressure dependence of signatures of the superconducting transition in the temperature dependent ac magnetic susceptibility $蠂(T)$ in high quality UTe$_2$ single crystals. We resolve a single superconducting transition in $蠂(T)$ at low pressures $<$ 0.3 GPa. At higher pressure, however, a second feature emerges in $蠂(T)$, which is located at the thermodynamic phase boundary between two separate superconducting states previously identified by specific heat studies. The observation of a two-step transition in $蠂(T)$ can be understood as a consequence of the change in the London penetration depth, when UTe$_2$ switches from one superconducting phase into another. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.06650v1-abstract-full').style.display = 'none'; document.getElementById('2403.06650v1-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.04550">arXiv:2403.04550</a> <span> [<a href="https://arxiv.org/pdf/2403.04550">pdf</a>, <a href="https://arxiv.org/format/2403.04550">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"> Electrical transport signatures of metallic surface state formation in the strongly-correlated insulator FeSb2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Eaton%2C+A+G">Alexander G. Eaton</a>, <a href="/search/cond-mat?searchtype=author&query=Popiel%2C+N+J+M">Nicholas J. M. Popiel</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+K">Ke-Jun Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Hickey%2C+A+J">Alexander J. Hickey</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+H">Hsu Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Hatnean%2C+M+C">Monica Ciomaga Hatnean</a>, <a href="/search/cond-mat?searchtype=author&query=Balakrishnan%2C+G">Geetha Balakrishnan</a>, <a href="/search/cond-mat?searchtype=author&query=Lange%2C+G+F">Gunnar F. Lange</a>, <a href="/search/cond-mat?searchtype=author&query=Slager%2C+R">Robert-Jan Slager</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Z">Zhi-Xun Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Sebastian%2C+S+E">Suchitra E. Sebastian</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.04550v1-abstract-short" style="display: inline;"> We present local and nonlocal electrical transport measurements of the correlated insulator FeSb$_2$. By employing wiring configurations that delineate between bulk- and surface-dominated conduction, we reveal the formation of a metallic surface state in FeSb$_2$ for temperatures $\lessapprox 5$~K. This result is corroborated by an angular rotation study of this material's magnetotransport, which… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.04550v1-abstract-full').style.display = 'inline'; document.getElementById('2403.04550v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.04550v1-abstract-full" style="display: none;"> We present local and nonlocal electrical transport measurements of the correlated insulator FeSb$_2$. By employing wiring configurations that delineate between bulk- and surface-dominated conduction, we reveal the formation of a metallic surface state in FeSb$_2$ for temperatures $\lessapprox 5$~K. This result is corroborated by an angular rotation study of this material's magnetotransport, which also shows signatures of the transition from bulk- to surface-dominated conduction over the same temperature interval as the local/nonlocal transport divergence. Notable similarities with the topological Kondo insulator candidate SmB$_6$ are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.04550v1-abstract-full').style.display = 'none'; document.getElementById('2403.04550v1-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.03946">arXiv:2403.03946</a> <span> [<a href="https://arxiv.org/pdf/2403.03946">pdf</a>, <a href="https://arxiv.org/format/2403.03946">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"> Pressure-enhanced $f$-electron orbital weighting in UTe2 mapped by quantum interferometry </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Weinberger%2C+T+I">T. I. Weinberger</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Z">Z. Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Hickey%2C+A+J">A. J. Hickey</a>, <a href="/search/cond-mat?searchtype=author&query=Graf%2C+D+E">D. E. Graf</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+G">G. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+P">P. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+R">R. Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Cabala%2C+A">A. Cabala</a>, <a href="/search/cond-mat?searchtype=author&query=Pu%2C+J">J. Pu</a>, <a href="/search/cond-mat?searchtype=author&query=Sechovsky%2C+V">V. Sechovsky</a>, <a href="/search/cond-mat?searchtype=author&query=Valiska%2C+M">M. Valiska</a>, <a href="/search/cond-mat?searchtype=author&query=Lonzarich%2C+G+G">G. G. Lonzarich</a>, <a href="/search/cond-mat?searchtype=author&query=Grosche%2C+F+M">F. M. Grosche</a>, <a href="/search/cond-mat?searchtype=author&query=Eaton%2C+A+G">A. G. Eaton</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.03946v1-abstract-short" style="display: inline;"> The phase landscape of UTe$_2$ features a remarkable diversity of superconducting phases under applied pressure and magnetic field. Recent quantum oscillation studies at ambient pressure have revealed the quasi-2D Fermi surface of this material. However, the pressure-dependence of the Fermi surface remains an open question. Here we track the evolution of the UTe$_2$ Fermi surface as a function of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03946v1-abstract-full').style.display = 'inline'; document.getElementById('2403.03946v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.03946v1-abstract-full" style="display: none;"> The phase landscape of UTe$_2$ features a remarkable diversity of superconducting phases under applied pressure and magnetic field. Recent quantum oscillation studies at ambient pressure have revealed the quasi-2D Fermi surface of this material. However, the pressure-dependence of the Fermi surface remains an open question. Here we track the evolution of the UTe$_2$ Fermi surface as a function of pressure up to 19.5 kbar by measuring quantum interference oscillations. We find that in sufficient magnetic field to suppress both superconductivity at low pressures and incommensurate antiferromagnetism at higher pressures, the quasi-2D Fermi surface found at ambient pressure smoothly connects to that at 19.5 kbar, with no signs of a reconstruction over this pressure interval. The warping of the cylindrical Fermi sheets continuously increases with pressure, which is consistent with increased $f$-orbital contribution at the Fermi level, up to and beyond the critical pressure at which superconductivity is truncated. These findings highlight the value of high pressure quantum interference measurements as a new probe of the electronic structure in heavy fermion materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03946v1-abstract-full').style.display = 'none'; document.getElementById('2403.03946v1-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.02535">arXiv:2403.02535</a> <span> [<a href="https://arxiv.org/pdf/2403.02535">pdf</a>, <a href="https://arxiv.org/format/2403.02535">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"> Three-dimensional quantum criticality </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Z">Z. Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Weinberger%2C+T+I">T. I. Weinberger</a>, <a href="/search/cond-mat?searchtype=author&query=Hickey%2C+A+J">A. J. Hickey</a>, <a href="/search/cond-mat?searchtype=author&query=Chichinadze%2C+D+V">D. V. Chichinadze</a>, <a href="/search/cond-mat?searchtype=author&query=Shaffer%2C+D">D. Shaffer</a>, <a href="/search/cond-mat?searchtype=author&query=Cabala%2C+A">A. Cabala</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+H">H. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Long%2C+M">M. Long</a>, <a href="/search/cond-mat?searchtype=author&query=Brumm%2C+T+J">T. J. Brumm</a>, <a href="/search/cond-mat?searchtype=author&query=Xie%2C+W">W. Xie</a>, <a href="/search/cond-mat?searchtype=author&query=Lin%2C+Y">Y. Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Skourski%2C+Y">Y. Skourski</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+Z">Z. Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Graf%2C+D+E">D. E. Graf</a>, <a href="/search/cond-mat?searchtype=author&query=Sechovsky%2C+V">V. Sechovsky</a>, <a href="/search/cond-mat?searchtype=author&query=Lonzarich%2C+G+G">G. G. Lonzarich</a>, <a href="/search/cond-mat?searchtype=author&query=Valiska%2C+M">M. Valiska</a>, <a href="/search/cond-mat?searchtype=author&query=Grosche%2C+F+M">F. M. Grosche</a>, <a href="/search/cond-mat?searchtype=author&query=Eaton%2C+A+G">A. G. Eaton</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.02535v2-abstract-short" style="display: inline;"> Quantum critical phenomena are widely studied across various materials families, from high temperature superconductors to magnetic insulators. They occur when a thermodynamic phase transition is suppressed to zero temperature as a function of some tuning parameter such as pressure or magnetic field. This generally yields a point of instability - a so-called quantum critical point - at which the ph… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.02535v2-abstract-full').style.display = 'inline'; document.getElementById('2403.02535v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.02535v2-abstract-full" style="display: none;"> Quantum critical phenomena are widely studied across various materials families, from high temperature superconductors to magnetic insulators. They occur when a thermodynamic phase transition is suppressed to zero temperature as a function of some tuning parameter such as pressure or magnetic field. This generally yields a point of instability - a so-called quantum critical point - at which the phase transition is driven exclusively by quantum mechanical fluctuations. Here we show that the heavy fermion metamagnet UTe$_2$ possesses a quantum phase transition at extreme magnetic field strengths of over 70 T. Surprisingly, rather than terminating at one singular point, we find that the phase boundary is sensitive to magnetic field components in each of the three cartesian axes of magnetic field space. This results in the three-dimensional transition surface being bounded by a continuous ring of quantum critical points, the locus of which forms an extended line of quantum criticality - a novel form of quantum critical phase boundary. Within this quantum critical line sits an intensely field-resilient superconducting state in a striking toroidal shape, persisting to fields over 70 T. We model our data by a phenomenological free energy expansion, and show how a three-dimensional quantum critical phase boundary - rather than a more conventional singular point of instability - anchors the remarkable high magnetic field phase landscape of UTe$_2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.02535v2-abstract-full').style.display = 'none'; document.getElementById('2403.02535v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.00568">arXiv:2307.00568</a> <span> [<a href="https://arxiv.org/pdf/2307.00568">pdf</a>, <a href="https://arxiv.org/format/2307.00568">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.132.266503">10.1103/PhysRevLett.132.266503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum interference between quasi-2D Fermi surface sheets in UTe2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Weinberger%2C+T+I">T. I. Weinberger</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Z">Z. Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Graf%2C+D+E">D. E. Graf</a>, <a href="/search/cond-mat?searchtype=author&query=Skourski%2C+Y">Y. Skourski</a>, <a href="/search/cond-mat?searchtype=author&query=Cabala%2C+A">A. Cabala</a>, <a href="/search/cond-mat?searchtype=author&query=Pospisil%2C+J">J. Pospisil</a>, <a href="/search/cond-mat?searchtype=author&query=Prokleska%2C+J">J. Prokleska</a>, <a href="/search/cond-mat?searchtype=author&query=Haidamak%2C+T">T. Haidamak</a>, <a href="/search/cond-mat?searchtype=author&query=Bastien%2C+G">G. Bastien</a>, <a href="/search/cond-mat?searchtype=author&query=Sechovsky%2C+V">V. Sechovsky</a>, <a href="/search/cond-mat?searchtype=author&query=Lonzarich%2C+G+G">G. G. Lonzarich</a>, <a href="/search/cond-mat?searchtype=author&query=Valiska%2C+M">M. Valiska</a>, <a href="/search/cond-mat?searchtype=author&query=Grosche%2C+F+M">F. M. Grosche</a>, <a href="/search/cond-mat?searchtype=author&query=Eaton%2C+A+G">A. G. Eaton</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="2307.00568v2-abstract-short" style="display: inline;"> UTe$_2$ is a spin-triplet superconductor candidate for which high quality samples with long mean free paths have recently become available, enabling quantum oscillation measurements to probe its Fermi surface and effective carrier masses. It has recently been reported that UTe$_2$ possesses a 3D Fermi surface component [Phys. Rev. Lett. 131, 036501 (2023)]. The distinction between 2D and 3D Fermi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.00568v2-abstract-full').style.display = 'inline'; document.getElementById('2307.00568v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.00568v2-abstract-full" style="display: none;"> UTe$_2$ is a spin-triplet superconductor candidate for which high quality samples with long mean free paths have recently become available, enabling quantum oscillation measurements to probe its Fermi surface and effective carrier masses. It has recently been reported that UTe$_2$ possesses a 3D Fermi surface component [Phys. Rev. Lett. 131, 036501 (2023)]. The distinction between 2D and 3D Fermi surface sections in triplet superconductors can have important implications regarding the topological properties of the superconductivity. Here we report the observation of oscillatory components in the magnetoconductance of UTe$_2$ at high magnetic fields. We find that these oscillations are well described by quantum interference between quasiparticles traversing semiclassical trajectories spanning magnetic breakdown networks. Our observations are consistent with a quasi-2D model of this material's Fermi surface based on prior dHvA-effect measurements. Our results strongly indicate that UTe$_2$ -- which exhibits a multitude of complex physical phenomena -- possesses a remarkably simple Fermi surface consisting exclusively of two quasi-2D cylindrical sections. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.00568v2-abstract-full').style.display = 'none'; document.getElementById('2307.00568v2-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 132, 266503 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.19033">arXiv:2305.19033</a> <span> [<a href="https://arxiv.org/pdf/2305.19033">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/10.1073/pnas.2403067121">10.1073/pnas.2403067121 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Enhanced triplet superconductivity in next generation ultraclean UTe2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Z">Z. Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Weinberger%2C+T+I">T. I. Weinberger</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+J">J. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Cabala%2C+A">A. Cabala</a>, <a href="/search/cond-mat?searchtype=author&query=Chichinadze%2C+D+V">D. V. Chichinadze</a>, <a href="/search/cond-mat?searchtype=author&query=Shaffer%2C+D">D. Shaffer</a>, <a href="/search/cond-mat?searchtype=author&query=Pospisil%2C+J">J. Pospisil</a>, <a href="/search/cond-mat?searchtype=author&query=Prokleska%2C+J">J. Prokleska</a>, <a href="/search/cond-mat?searchtype=author&query=Haidamak%2C+T">T. Haidamak</a>, <a href="/search/cond-mat?searchtype=author&query=Bastien%2C+G">G. Bastien</a>, <a href="/search/cond-mat?searchtype=author&query=Sechovsky%2C+V">V. Sechovsky</a>, <a href="/search/cond-mat?searchtype=author&query=Hickey%2C+A+J">A. J. Hickey</a>, <a href="/search/cond-mat?searchtype=author&query=Mancera-Ugarte%2C+M+J">M. J. Mancera-Ugarte</a>, <a href="/search/cond-mat?searchtype=author&query=Benjamin%2C+S">S. Benjamin</a>, <a href="/search/cond-mat?searchtype=author&query=Graf%2C+D+E">D. E. Graf</a>, <a href="/search/cond-mat?searchtype=author&query=Skourski%2C+Y">Y. Skourski</a>, <a href="/search/cond-mat?searchtype=author&query=Lonzarich%2C+G+G">G. G. Lonzarich</a>, <a href="/search/cond-mat?searchtype=author&query=Valiska%2C+M">M. Valiska</a>, <a href="/search/cond-mat?searchtype=author&query=Grosche%2C+F+M">F. M. Grosche</a>, <a href="/search/cond-mat?searchtype=author&query=Eaton%2C+A+G">A. G. Eaton</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="2305.19033v3-abstract-short" style="display: inline;"> The unconventional superconductor UTe$_2$ exhibits numerous signatures of spin-triplet superconductivity -- a rare state of matter which could enable quantum computation protected against decoherence. UTe$_2$ possesses a complex phase landscape comprising two magnetic field-induced superconducting phases, a metamagnetic transition to a field-polarised state, along with pair- and charge-density wav… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.19033v3-abstract-full').style.display = 'inline'; document.getElementById('2305.19033v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.19033v3-abstract-full" style="display: none;"> The unconventional superconductor UTe$_2$ exhibits numerous signatures of spin-triplet superconductivity -- a rare state of matter which could enable quantum computation protected against decoherence. UTe$_2$ possesses a complex phase landscape comprising two magnetic field-induced superconducting phases, a metamagnetic transition to a field-polarised state, along with pair- and charge-density wave orders. However, contradictory reports between studies performed on UTe$_2$ specimens of varying quality have severely impeded theoretical efforts to understand the microscopic origins of the exotic superconductivity. Here, we report a comprehensive suite of high magnetic field measurements on a new generation of pristine quality UTe$_2$ crystals. Our experiments reveal a significantly revised high magnetic field superconducting phase diagram in the ultraclean limit, showing a pronounced sensitivity of field-induced superconductivity to the presence of crystalline disorder. We employ a Ginzburg-Landau model that excellently captures this acute dependence on sample quality. Our results suggest that in close proximity to a field--induced metamagnetic transition the enhanced role of magnetic fluctuations -- that are strongly suppressed by disorder -- is likely responsible for tuning UTe$_2$ between two distinct spin-triplet superconducting phases. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.19033v3-abstract-full').style.display = 'none'; document.getElementById('2305.19033v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PNAS 121 (37) e2403067121 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.04758">arXiv:2302.04758</a> <span> [<a href="https://arxiv.org/pdf/2302.04758">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/10.1038/s41467-023-44110-4">10.1038/s41467-023-44110-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quasi-2D Fermi surface in the anomalous superconductor UTe2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Eaton%2C+A+G">A. G. Eaton</a>, <a href="/search/cond-mat?searchtype=author&query=Weinberger%2C+T+I">T. I. Weinberger</a>, <a href="/search/cond-mat?searchtype=author&query=Popiel%2C+N+J+M">N. J. M. Popiel</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Z">Z. Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Hickey%2C+A+J">A. J. Hickey</a>, <a href="/search/cond-mat?searchtype=author&query=Cabala%2C+A">A. Cabala</a>, <a href="/search/cond-mat?searchtype=author&query=Pospisil%2C+J">J. Pospisil</a>, <a href="/search/cond-mat?searchtype=author&query=Prokleska%2C+J">J. Prokleska</a>, <a href="/search/cond-mat?searchtype=author&query=Haidamak%2C+T">T. Haidamak</a>, <a href="/search/cond-mat?searchtype=author&query=Bastien%2C+G">G. Bastien</a>, <a href="/search/cond-mat?searchtype=author&query=Opletal%2C+P">P. Opletal</a>, <a href="/search/cond-mat?searchtype=author&query=Sakai%2C+H">H. Sakai</a>, <a href="/search/cond-mat?searchtype=author&query=Haga%2C+Y">Y. Haga</a>, <a href="/search/cond-mat?searchtype=author&query=Nowell%2C+R">R. Nowell</a>, <a href="/search/cond-mat?searchtype=author&query=Benjamin%2C+S+M">S. M. Benjamin</a>, <a href="/search/cond-mat?searchtype=author&query=Sechovsky%2C+V">V. Sechovsky</a>, <a href="/search/cond-mat?searchtype=author&query=Lonzarich%2C+G+G">G. G. Lonzarich</a>, <a href="/search/cond-mat?searchtype=author&query=Grosche%2C+F+M">F. M. Grosche</a>, <a href="/search/cond-mat?searchtype=author&query=Valiska%2C+M">M. Valiska</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="2302.04758v3-abstract-short" style="display: inline;"> The heavy fermion paramagnet UTe$_2$ exhibits numerous characteristics of spin-triplet superconductivity. Efforts to understand the microscopic details of this exotic superconductivity have been impeded by uncertainty regarding the underlying electronic structure. Here we directly probe the Fermi surface of UTe$_2$ by measuring magnetic quantum oscillations in pristine quality crystals. We find an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.04758v3-abstract-full').style.display = 'inline'; document.getElementById('2302.04758v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.04758v3-abstract-full" style="display: none;"> The heavy fermion paramagnet UTe$_2$ exhibits numerous characteristics of spin-triplet superconductivity. Efforts to understand the microscopic details of this exotic superconductivity have been impeded by uncertainty regarding the underlying electronic structure. Here we directly probe the Fermi surface of UTe$_2$ by measuring magnetic quantum oscillations in pristine quality crystals. We find an angular profile of quantum oscillatory frequency and amplitude that is characteristic of a quasi-2D Fermi surface, which we find is well described by two cylindrical Fermi sheets of electron- and hole-type respectively. Additionally, we find that both cylindrical Fermi sheets possess considerable undulation but negligible small-scale corrugation, which may allow for their near-nesting and therefore promote magnetic fluctuations that enhance the triplet pairing mechanism. Importantly, we find no evidence for the presence of any 3D Fermi surface sections. Our results place strong constraints on the possible symmetry of the superconducting order parameter in UTe$_2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.04758v3-abstract-full').style.display = 'none'; document.getElementById('2302.04758v3-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 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 15, 223 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.09545">arXiv:2102.09545</a> <span> [<a href="https://arxiv.org/pdf/2102.09545">pdf</a>, <a href="https://arxiv.org/format/2102.09545">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/s41535-021-00413-7">10.1038/s41535-021-00413-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $f$-electron hybridised metallic Fermi surface in magnetic field-induced metallic YbB$_{12}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Liu%2C+H">H. Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Hickey%2C+A+J">A. J. Hickey</a>, <a href="/search/cond-mat?searchtype=author&query=Hartstein%2C+M">M. Hartstein</a>, <a href="/search/cond-mat?searchtype=author&query=Davies%2C+A+J">A. J. Davies</a>, <a href="/search/cond-mat?searchtype=author&query=Eaton%2C+A+G">A. G. Eaton</a>, <a href="/search/cond-mat?searchtype=author&query=Elvin%2C+T">T. Elvin</a>, <a href="/search/cond-mat?searchtype=author&query=Polyakov%2C+E">E. Polyakov</a>, <a href="/search/cond-mat?searchtype=author&query=Vu%2C+T+H">T. H. Vu</a>, <a href="/search/cond-mat?searchtype=author&query=Wichitwechkarn%2C+V">V. Wichitwechkarn</a>, <a href="/search/cond-mat?searchtype=author&query=F%C3%B6rster%2C+T">T. F枚rster</a>, <a href="/search/cond-mat?searchtype=author&query=Wosnitza%2C+J">J. Wosnitza</a>, <a href="/search/cond-mat?searchtype=author&query=Murphy%2C+T+P">T. P. Murphy</a>, <a href="/search/cond-mat?searchtype=author&query=Shitsevalova%2C+N">N. Shitsevalova</a>, <a href="/search/cond-mat?searchtype=author&query=Johannes%2C+M+D">M. D. Johannes</a>, <a href="/search/cond-mat?searchtype=author&query=Hatnean%2C+M+C">M. Ciomaga Hatnean</a>, <a href="/search/cond-mat?searchtype=author&query=Balakrishnan%2C+G">G. Balakrishnan</a>, <a href="/search/cond-mat?searchtype=author&query=Lonzarich%2C+G+G">G. G. Lonzarich</a>, <a href="/search/cond-mat?searchtype=author&query=Sebastian%2C+S+E">Suchitra E. Sebastian</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="2102.09545v2-abstract-short" style="display: inline;"> The nature of the Fermi surface observed in the recently discovered family of unconventional insulators starting with SmB$_6$ and subsequently YbB$_{12}$ is a subject of intense inquiry. Here we shed light on this question by comparing quantum oscillations between the high magnetic field-induced metallic regime in YbB$_{12}$ and the unconventional insulating regime. In the field-induced metallic r… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.09545v2-abstract-full').style.display = 'inline'; document.getElementById('2102.09545v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.09545v2-abstract-full" style="display: none;"> The nature of the Fermi surface observed in the recently discovered family of unconventional insulators starting with SmB$_6$ and subsequently YbB$_{12}$ is a subject of intense inquiry. Here we shed light on this question by comparing quantum oscillations between the high magnetic field-induced metallic regime in YbB$_{12}$ and the unconventional insulating regime. In the field-induced metallic regime beyond 47 T, we find prominent quantum oscillations in the contactless resistivity characterised by multiple frequencies up to at least 3000 T and heavy effective masses up to at least 17 $m_\text{e}$, characteristic of an $f$-electron hybridised metallic Fermi surface. The growth of quantum oscillation amplitude at low temperatures in electrical transport and magnetic torque in insulating YbB$_{12}$ is closely similar to the Lifshitz-Kosevich low temperature growth of quantum oscillation amplitude in field-induced metallic YbB$_{12}$, pointing to an origin of quantum oscillations in insulating YbB$_{12}$ from in-gap neutral low energy excitations. The field-induced metallic regime of YbB$_{12}$ is characterised by more Fermi surface sheets of heavy quasiparticle effective mass that emerge in addition to the heavy Fermi surface sheets yielding multiple quantum oscillation frequencies below 1000 T observed in both insulating and metallic regimes. We thus observe a heavy multi-component Fermi surface in which $f$-electron hybridisation persists from the unconventional insulating to the field-induced metallic regime of YbB$_{12}$, which is in distinct contrast to the unhybridised conduction electron Fermi surface observed in the case of the unconventional insulator SmB$_6$. Our findings require a different theoretical model of neutral in-gap low energy excitations in which the $f$-electron hybridisation is retained in the case of the unconventional insulator YbB$_{12}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.09545v2-abstract-full').style.display = 'none'; document.getElementById('2102.09545v2-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 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 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">Journal ref:</span> npj Quantum Materials 7, 12 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.04927">arXiv:2102.04927</a> <span> [<a href="https://arxiv.org/pdf/2102.04927">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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1073/pnas.2021216118">10.1073/pnas.2021216118 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unconventional quantum vortex matter state hosts quantum oscillations in the underdoped high-temperature cuprate superconductors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hsu%2C+Y">Yu-Te Hsu</a>, <a href="/search/cond-mat?searchtype=author&query=Hartstein%2C+M">M谩t茅 Hartstein</a>, <a href="/search/cond-mat?searchtype=author&query=Davies%2C+A+J">Alexander J. Davies</a>, <a href="/search/cond-mat?searchtype=author&query=Hickey%2C+A+J">Alexander J. Hickey</a>, <a href="/search/cond-mat?searchtype=author&query=Chan%2C+M+K">Mun K. Chan</a>, <a href="/search/cond-mat?searchtype=author&query=Porras%2C+J">Juan Porras</a>, <a href="/search/cond-mat?searchtype=author&query=Loew%2C+T">Toshinao Loew</a>, <a href="/search/cond-mat?searchtype=author&query=Taylor%2C+S+V">Sofia V. Taylor</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+H">Hsu Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Eaton%2C+A+G">Alexander G. Eaton</a>, <a href="/search/cond-mat?searchtype=author&query=Tacon%2C+M+L">Matthieu Le Tacon</a>, <a href="/search/cond-mat?searchtype=author&query=Zuo%2C+H">Huakun Zuo</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+J">Jinhua Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+Z">Zengwei Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Lonzarich%2C+G+G">Gilbert G. Lonzarich</a>, <a href="/search/cond-mat?searchtype=author&query=Keimer%2C+B">Bernhard Keimer</a>, <a href="/search/cond-mat?searchtype=author&query=Harrison%2C+N">Neil Harrison</a>, <a href="/search/cond-mat?searchtype=author&query=Sebastian%2C+S+E">Suchitra E. Sebastian</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="2102.04927v2-abstract-short" style="display: inline;"> A central question in the underdoped cuprates pertains to the nature of the pseudogap ground state. A conventional metallic ground state of the pseudogap region has been argued to host quantum oscillations upon destruction of the superconducting order parameter by modest magnetic fields. Here we use low applied measurement currents and millikelvin temperatures on ultra-pure single crystals of unde… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.04927v2-abstract-full').style.display = 'inline'; document.getElementById('2102.04927v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.04927v2-abstract-full" style="display: none;"> A central question in the underdoped cuprates pertains to the nature of the pseudogap ground state. A conventional metallic ground state of the pseudogap region has been argued to host quantum oscillations upon destruction of the superconducting order parameter by modest magnetic fields. Here we use low applied measurement currents and millikelvin temperatures on ultra-pure single crystals of underdoped YBa$_2$Cu$_3$O$_{6+x}$ to unearth an unconventional quantum vortex matter ground state characterized by vanishing electrical resistivity, magnetic hysteresis, and non-ohmic electrical transport characteristics beyond the highest laboratory accessible static fields. A new model of the pseudogap ground state is now required to explain quantum oscillations that are hosted by the bulk quantum vortex matter state without experiencing sizeable additional damping in the presence of a large maximum superconducting gap; possibilities include a pair density wave. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.04927v2-abstract-full').style.display = 'none'; document.getElementById('2102.04927v2-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 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 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">PNAS Commentary 'Fragile superconductivity at high magnetic fields' by Michael R. Norman, PNAS February 16, 2021 118 (7) e2100372118; https://doi.org/10.1073/pnas.2100372118</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PNAS February 16, 2021 118 (7) e2021216118 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact 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