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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Islam%2C+Z&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Islam%2C+Z&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Islam%2C+Z&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.08842">arXiv:2408.08842</a> <span> [<a href="https://arxiv.org/pdf/2408.08842">pdf</a>, <a href="https://arxiv.org/format/2408.08842">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="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/PhysRevMaterials.8.093601">10.1103/PhysRevMaterials.8.093601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Phase-Separated Charge Order and Twinning Across Length Scales in CsV$_3$Sb$_5$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Plumb%2C+J">Jayden Plumb</a>, <a href="/search/cond-mat?searchtype=author&query=Salinas%2C+A+C">Andrea Capa Salinas</a>, <a href="/search/cond-mat?searchtype=author&query=Mallayya%2C+K">Krishnanand Mallayya</a>, <a href="/search/cond-mat?searchtype=author&query=Kisiel%2C+E">Elliot Kisiel</a>, <a href="/search/cond-mat?searchtype=author&query=Carneiro%2C+F+B">Fellipe B. Carneiro</a>, <a href="/search/cond-mat?searchtype=author&query=Gomez%2C+R">Reina Gomez</a>, <a href="/search/cond-mat?searchtype=author&query=Pokharel%2C+G">Ganesh Pokharel</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+E">Eun-Ah Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Sarker%2C+S">Suchismita Sarker</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Daly%2C+S">Sam Daly</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+S+D">Stephen D. Wilson</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="2408.08842v2-abstract-short" style="display: inline;"> We present X-ray scattering studies resolving structural twinning and phase separation in the charge density wave (CDW) state of the kagome superconductor CsV$_3$Sb$_5$. The three-dimensional CDW state in CsV$_3$Sb$_5$ is reported to form a complex superposition of Star of David (SoD) or Tri-Hexagonal (TrH) patterns of distortion within its kagome planes, but the out-of-plane stacking is marked by… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.08842v2-abstract-full').style.display = 'inline'; document.getElementById('2408.08842v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.08842v2-abstract-full" style="display: none;"> We present X-ray scattering studies resolving structural twinning and phase separation in the charge density wave (CDW) state of the kagome superconductor CsV$_3$Sb$_5$. The three-dimensional CDW state in CsV$_3$Sb$_5$ is reported to form a complex superposition of Star of David (SoD) or Tri-Hexagonal (TrH) patterns of distortion within its kagome planes, but the out-of-plane stacking is marked by metastability. In order to resolve the impact of this metastability, we present reciprocal space mapping and real-space images of CsV$_3$Sb$_5$ collected across multiple length scales using temperature-dependent high-dynamic range mapping (HDRM) and dark-field X-ray microscopy (DFXM). The experimental data provide evidence for a rich microstructure that forms in the CDW state. Data evidence metastability in the formation of $2\times 2\times 4$ and $2\times 2\times 2$ CDW supercells dependent on thermal history and mechanical deformation. We further directly resolve the real space phase segregation of both supercells as well as a real-space, structural twinning driven by the broken rotational symmetry of the CDW state. Our combined results provide insights into the role of microstructure and twinning in experiments probing the electronic properties of CsV$_3$Sb$_5$ where rotational symmetry is broken by the three-dimensional charge density wave order but locally preserved for any single kagome layer. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.08842v2-abstract-full').style.display = 'none'; document.getElementById('2408.08842v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Materials, 8, 093601 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.14688">arXiv:2406.14688</a> <span> [<a href="https://arxiv.org/pdf/2406.14688">pdf</a>, <a href="https://arxiv.org/format/2406.14688">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.110.145101">10.1103/PhysRevB.110.145101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Absence of a bulk charge density wave signature in x-ray measurements of UTe$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kengle%2C+C+S">Caitlin S. Kengle</a>, <a href="/search/cond-mat?searchtype=author&query=Chaudhuri%2C+D">Dipanjan Chaudhuri</a>, <a href="/search/cond-mat?searchtype=author&query=Guo%2C+X">Xuefei Guo</a>, <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+T+A">Thomas A. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=Bettler%2C+S">Simon Bettler</a>, <a href="/search/cond-mat?searchtype=author&query=Simeth%2C+W">Wolfgang Simeth</a>, <a href="/search/cond-mat?searchtype=author&query=Krogstad%2C+M+J">Matthew J. Krogstad</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahir Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Ran%2C+S">Sheng Ran</a>, <a href="/search/cond-mat?searchtype=author&query=Saha%2C+S+R">Shanta R. Saha</a>, <a href="/search/cond-mat?searchtype=author&query=Paglione%2C+J">Johnpierre Paglione</a>, <a href="/search/cond-mat?searchtype=author&query=Butch%2C+N+P">Nicholas P. Butch</a>, <a href="/search/cond-mat?searchtype=author&query=Fradkin%2C+E">Eduardo Fradkin</a>, <a href="/search/cond-mat?searchtype=author&query=Madhavan%2C+V">Vidya Madhavan</a>, <a href="/search/cond-mat?searchtype=author&query=Abbamonte%2C+P">Peter Abbamonte</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="2406.14688v3-abstract-short" style="display: inline;"> The long-sought pair density wave (PDW) is an exotic phase of matter in which charge density wave (CDW) order is intertwined with the amplitude or phase of coexisting, superconducting order \cite{Berg2009,Berg2009b}. Originally predicted to exist in copper-oxides, circumstantial evidence for PDW order now exists in a variety of materials. Recently, scanning tunneling microscopy (STM) studies have… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.14688v3-abstract-full').style.display = 'inline'; document.getElementById('2406.14688v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.14688v3-abstract-full" style="display: none;"> The long-sought pair density wave (PDW) is an exotic phase of matter in which charge density wave (CDW) order is intertwined with the amplitude or phase of coexisting, superconducting order \cite{Berg2009,Berg2009b}. Originally predicted to exist in copper-oxides, circumstantial evidence for PDW order now exists in a variety of materials. Recently, scanning tunneling microscopy (STM) studies have reported evidence for a three-component charge density wave (CDW) at the surface of the heavy-fermion superconductor, UTe$_2$, persisting below its superconducting transition temperature. Here, we use hard x-ray diffraction measurements on crystals of UTe$_2$ at $T = 1.9$ K and $12$ K to search for a bulk signature of this CDW. Using STM measurements as a constraint, we calculate the expected locations of CDW superlattice peaks, and sweep a large volume of reciprocal space in search of a signature. We failed to find any evidence for a CDW near any of the expected superlattice positions in many Brillouin zones. We estimate an upper bound on the CDW lattice distortion of $u_{max} \lesssim 4 \times 10^{-3} \mathrm脜$. Our results suggest that the CDW observed in STM is either purely electronic, somehow lacking a signature in the structural lattice, or is restricted to the material surface. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.14688v3-abstract-full').style.display = 'none'; document.getElementById('2406.14688v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 110, 145101 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.12799">arXiv:2405.12799</a> <span> [<a href="https://arxiv.org/pdf/2405.12799">pdf</a>, <a href="https://arxiv.org/format/2405.12799">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="Signal Processing">eess.SP</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Dark-Field X-Ray Microscopy with Structured Illumination for Three-Dimensional Imaging </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=G%C3%BCrsoy%2C+D">Do臒a G眉rsoy</a>, <a href="/search/cond-mat?searchtype=author&query=Yay%2C+K+A">Kaan Alp Yay</a>, <a href="/search/cond-mat?searchtype=author&query=Kisiel%2C+E">Elliot Kisiel</a>, <a href="/search/cond-mat?searchtype=author&query=Wojcik%2C+M">Michael Wojcik</a>, <a href="/search/cond-mat?searchtype=author&query=Sheyfer%2C+D">Dina Sheyfer</a>, <a href="/search/cond-mat?searchtype=author&query=Last%2C+A">Arndt Last</a>, <a href="/search/cond-mat?searchtype=author&query=Highland%2C+M">Matthew Highland</a>, <a href="/search/cond-mat?searchtype=author&query=Fisher%2C+I+R">Ian Randal Fisher</a>, <a href="/search/cond-mat?searchtype=author&query=Hruszkewycz%2C+S">Stephan Hruszkewycz</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahir Islam</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="2405.12799v2-abstract-short" style="display: inline;"> We introduce a structured illumination technique for dark-field x-ray microscopy optimized for three-dimensional imaging of ordered materials at sub-micrometer length scales. Our method utilizes a coded aperture to spatially modulate the incident x-ray beam on the sample, enabling the reconstruction of the sample's 3D structure from images captured at various aperture positions. Unlike common volu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.12799v2-abstract-full').style.display = 'inline'; document.getElementById('2405.12799v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.12799v2-abstract-full" style="display: none;"> We introduce a structured illumination technique for dark-field x-ray microscopy optimized for three-dimensional imaging of ordered materials at sub-micrometer length scales. Our method utilizes a coded aperture to spatially modulate the incident x-ray beam on the sample, enabling the reconstruction of the sample's 3D structure from images captured at various aperture positions. Unlike common volumetric imaging techniques such as tomography, our approach casts a scanning x-ray silhouette of a coded aperture for depth resolution along the axis of diffraction, eliminating any need for sample rotation or rastering, leading to a highly stable imaging modality. This modification provides robustness against geometric uncertainties during data acquisition, particularly for achieving sub-micrometer resolutions where geometric uncertainties typically limit resolution. We introduce the image reconstruction model and validate our results with experimental data on an isolated twin domain within a bulk single crystal of an iron pnictide obtained using a dark-field x-ray microscope. This timely advancement aligns with the enhanced brightness upgrade of the world's synchrotron radiation facilities, opening unprecedented opportunities in imaging. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.12799v2-abstract-full').style.display = 'none'; document.getElementById('2405.12799v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> 78 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.07001">arXiv:2310.07001</a> <span> [<a href="https://arxiv.org/pdf/2310.07001">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Local strain inhomogeneities during the electrical triggering of a metal-insulator transition revealed by the x-ray microscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Salev%2C+P">Pavel Salev</a>, <a href="/search/cond-mat?searchtype=author&query=Kisiel%2C+E">Elliot Kisiel</a>, <a href="/search/cond-mat?searchtype=author&query=Sasaki%2C+D">Dayne Sasaki</a>, <a href="/search/cond-mat?searchtype=author&query=Gunn%2C+B">Brandon Gunn</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+W">Wei He</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+M">Mingzhen Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">Junjie Li</a>, <a href="/search/cond-mat?searchtype=author&query=Tamura%2C+N">Nobumichi Tamura</a>, <a href="/search/cond-mat?searchtype=author&query=Poudyal%2C+I">Ishwor Poudyal</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahir Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Takamura%2C+Y">Yayoi Takamura</a>, <a href="/search/cond-mat?searchtype=author&query=Frano%2C+A">Alex Frano</a>, <a href="/search/cond-mat?searchtype=author&query=Schuller%2C+I+K">Ivan K. Schuller</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.07001v1-abstract-short" style="display: inline;"> Electrical triggering of a metal-insulator transition (MIT) often results in the formation of characteristic spatial patterns such as a metallic filament percolating through an insulating matrix or an insulating barrier splitting a conducting matrix. When the MIT triggering is driven by electrothermal effects, the temperature of the filament or barrier can be substantially higher than the rest of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.07001v1-abstract-full').style.display = 'inline'; document.getElementById('2310.07001v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.07001v1-abstract-full" style="display: none;"> Electrical triggering of a metal-insulator transition (MIT) often results in the formation of characteristic spatial patterns such as a metallic filament percolating through an insulating matrix or an insulating barrier splitting a conducting matrix. When the MIT triggering is driven by electrothermal effects, the temperature of the filament or barrier can be substantially higher than the rest of material. Using x-ray microdiffraction and dark-field x-ray microscopy, we show that electrothermal MIT triggering leads to the development of an inhomogeneous strain profile across the switching device, even when the material does not undergo a 1st order structural phase transition coinciding with the MIT. Diffraction measurements further reveal evidence of lattice distortions and twinning occurring within the MIT switching device, highlighting a qualitative distinction between the electrothermal process and equilibrium thermal lattice expansion in nonlinear electrical systems. Electrically induced strain development, lattice distortions, and twinning could have important contributions in the MIT triggering process and could drive the material into non-equilibrium states, providing an unconventional pathway to explore the phase space of strongly correlated electronic systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.07001v1-abstract-full').style.display = 'none'; document.getElementById('2310.07001v1-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 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.15712">arXiv:2309.15712</a> <span> [<a href="https://arxiv.org/pdf/2309.15712">pdf</a>, <a href="https://arxiv.org/format/2309.15712">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> High-Resolution Full-field Structural Microscopy of the Voltage Induced Filament Formation in Neuromorphic Devices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kisiel%2C+E">Elliot Kisiel</a>, <a href="/search/cond-mat?searchtype=author&query=Salev%2C+P">Pavel Salev</a>, <a href="/search/cond-mat?searchtype=author&query=Poudyal%2C+I">Ishwor Poudyal</a>, <a href="/search/cond-mat?searchtype=author&query=Baptista%2C+F">Fellipe Baptista</a>, <a href="/search/cond-mat?searchtype=author&query=Rodolakis%2C+F">Fanny Rodolakis</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+Z">Zhan Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Shpyrko%2C+O">Oleg Shpyrko</a>, <a href="/search/cond-mat?searchtype=author&query=Schuller%2C+I+K">Ivan K. Schuller</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahir Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Frano%2C+A">Alex Frano</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.15712v1-abstract-short" style="display: inline;"> Neuromorphic functionalities in memristive devices are commonly associated with the ability to electrically create local conductive pathways by resistive switching. The archetypal correlated material, VO2, has been intensively studied for its complex electronic and structural phase transition as well as its filament formation under applied voltages. Local structural studies of the filament behavio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.15712v1-abstract-full').style.display = 'inline'; document.getElementById('2309.15712v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.15712v1-abstract-full" style="display: none;"> Neuromorphic functionalities in memristive devices are commonly associated with the ability to electrically create local conductive pathways by resistive switching. The archetypal correlated material, VO2, has been intensively studied for its complex electronic and structural phase transition as well as its filament formation under applied voltages. Local structural studies of the filament behavior are often limited due to time-consuming rastering which makes impractical many experiments aimed at investigating large spatial areas or temporal dynamics associated with the electrical triggering of the phase transition. Utilizing Dark Field X-ray Microscopy (DFXM), a novel full-field x-ray imaging technique, we study this complex filament formation process in-operando in VO2 devices from a structural perspective. We show that prior to filament formation, there is a significant gain of the metallic rutile phase beneath the metal electrodes that define the device. We observed that the filament formation follows a preferential path determined by the nucleation sites within the device. These nucleation sites are predisposed to the phase transition and can persistently maintain the high-temperature rutile phase even after returning to room temperature, which can enable a novel training/learning mechanism. Filament formation also appears to follow a preferential path determined by a nucleation site within the device which is predisposed to the rutile transition even after returning to room temperature. Finally, we found that small isolated low-temperature phase clusters can be present inside the high-temperature filaments indicating that the filament structure is not uniform. Our results provide a unique perspective on the electrically induced filament formation in metal-insulator transition materials, which further the basic understanding of this resistive switching. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.15712v1-abstract-full').style.display = 'none'; document.getElementById('2309.15712v1-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 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">29 pages, 10 figures; 19 pages main text, 3 figures; 10 pages Supplementary material, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.07960">arXiv:2304.07960</a> <span> [<a href="https://arxiv.org/pdf/2304.07960">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="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Two-Dimensional Short-Range Chemical Ordering in Ba1-xNaxFe2As2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stadel%2C+R">R. Stadel</a>, <a href="/search/cond-mat?searchtype=author&query=DeRose%2C+R">R. DeRose</a>, <a href="/search/cond-mat?searchtype=author&query=Taddei%2C+K+M">K. M. Taddei</a>, <a href="/search/cond-mat?searchtype=author&query=Krogstad%2C+M+J">M. J. Krogstad</a>, <a href="/search/cond-mat?searchtype=author&query=Upreti%2C+P">P. Upreti</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Phelan%2C+D">D. Phelan</a>, <a href="/search/cond-mat?searchtype=author&query=Chung%2C+D+Y">D. Y. Chung</a>, <a href="/search/cond-mat?searchtype=author&query=Osborn%2C+R">R. Osborn</a>, <a href="/search/cond-mat?searchtype=author&query=Rosenkranz%2C+S">S. Rosenkranz</a>, <a href="/search/cond-mat?searchtype=author&query=Chmaissem%2C+O">O. Chmaissem</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="2304.07960v1-abstract-short" style="display: inline;"> A true understanding of the properties of pnictide superconductors require the development of high-quality materials and performing measurements designed to unravel their intrinsic properties and short-range nematic correlations which are often obscured by extrinsic effects such as poor crystallinity, inhomogeneity, domain formation and twinning. In this paper, we report the systematic growth of h… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.07960v1-abstract-full').style.display = 'inline'; document.getElementById('2304.07960v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.07960v1-abstract-full" style="display: none;"> A true understanding of the properties of pnictide superconductors require the development of high-quality materials and performing measurements designed to unravel their intrinsic properties and short-range nematic correlations which are often obscured by extrinsic effects such as poor crystallinity, inhomogeneity, domain formation and twinning. In this paper, we report the systematic growth of high-quality Na-substituted BaFe2As2 single crystals and their characterization using pulsed-magnetic fields x-ray diffraction and x-ray diffuse scattering. Analysis of the properties and compositions of the highest quality crystals show that their actual Na stoichiometry is about 50-60% of the nominal content and that the targeted production of crystals with specific compositions is accessible. We derived a reliable equation to estimate the Na stoichiometry based on the measured superconducting TC of these materials. Attempting to force spin reorientation and induce tetragonality, orthorhombic Ba1-xNaxFe2As2 single crystals subjected to out-of-plane magnetic fields up to 31.4T are found to exhibit strong in-plane magnetic anisotropy demonstrated by the insufficiency of such high fields in manipulating the relative population of their twinned domains or in suppressing the orthorhombic order. Broad x-ray diffuse intensity rods observed at temperatures between 30 K and 300 K uncover short-range structural correlations. Local structure modeling together with 3D-螖PDF mapping of real-space interatomic vectors show that the diffuse scattering arises from in-plane short-range chemical correlations of the Ba and Na atoms coupled with short-range atomic displacements within the same plane due to an effective size difference between the two atomic species. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.07960v1-abstract-full').style.display = 'none'; document.getElementById('2304.07960v1-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 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.07303">arXiv:2212.07303</a> <span> [<a href="https://arxiv.org/pdf/2212.07303">pdf</a>, <a href="https://arxiv.org/format/2212.07303">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="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Full-Field Nanoscale X-ray Diffraction-Contrast Imaging using Direct Detection </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kisiel%2C+E">Elliot Kisiel</a>, <a href="/search/cond-mat?searchtype=author&query=Poudyal%2C+I">Ishwor Poudyal</a>, <a href="/search/cond-mat?searchtype=author&query=Kenesei%2C+P">Peter Kenesei</a>, <a href="/search/cond-mat?searchtype=author&query=Engbretson%2C+M">Mark Engbretson</a>, <a href="/search/cond-mat?searchtype=author&query=Last%2C+A">Arndt Last</a>, <a href="/search/cond-mat?searchtype=author&query=Basak%2C+R">Rourav Basak</a>, <a href="/search/cond-mat?searchtype=author&query=Zaluzhnyy%2C+I">Ivan Zaluzhnyy</a>, <a href="/search/cond-mat?searchtype=author&query=Goteti%2C+U">Uday Goteti</a>, <a href="/search/cond-mat?searchtype=author&query=Dynes%2C+R">Robert Dynes</a>, <a href="/search/cond-mat?searchtype=author&query=Miceli%2C+A">Antonino Miceli</a>, <a href="/search/cond-mat?searchtype=author&query=Frano%2C+A">Alex Frano</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahir Islam</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="2212.07303v2-abstract-short" style="display: inline;"> Recent developments in x-ray science provide methods to probe deeply embedded mesoscale grain structures and spatially resolve them using dark field x-ray microscopy (DFXM). Extending this technique to investigate weak diffraction signals such as magnetic systems, quantum materials and thin films proves challenging due to available detection methods and incident x-ray flux at the sample. We presen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.07303v2-abstract-full').style.display = 'inline'; document.getElementById('2212.07303v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.07303v2-abstract-full" style="display: none;"> Recent developments in x-ray science provide methods to probe deeply embedded mesoscale grain structures and spatially resolve them using dark field x-ray microscopy (DFXM). Extending this technique to investigate weak diffraction signals such as magnetic systems, quantum materials and thin films proves challenging due to available detection methods and incident x-ray flux at the sample. We present a direct detection method focusing on DFXM studies in the hard x-ray range of 10s of keV and above capable of approaching nanoscale resolution. Additionally, we compare this direct detection scheme with routinely used scintillator based optical detection and achieve an order of magnitude improvement in exposure times allowing for imaging of weakly diffracting ordered systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.07303v2-abstract-full').style.display = 'none'; document.getElementById('2212.07303v2-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, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">8 pages, 6 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/2211.16602">arXiv:2211.16602</a> <span> [<a href="https://arxiv.org/pdf/2211.16602">pdf</a>, <a href="https://arxiv.org/format/2211.16602">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/PhysRevMaterials.7.024806">10.1103/PhysRevMaterials.7.024806 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Structural evolution of the kagome superconductors $A$V$_3$Sb$_5$ ($A$ = K, Rb, and Cs) through charge density wave order </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kautzsch%2C+L">Linus Kautzsch</a>, <a href="/search/cond-mat?searchtype=author&query=Ortiz%2C+B+R">Brenden R. Ortiz</a>, <a href="/search/cond-mat?searchtype=author&query=Mallayya%2C+K">Krishnanand Mallayya</a>, <a href="/search/cond-mat?searchtype=author&query=Plumb%2C+J">Jayden Plumb</a>, <a href="/search/cond-mat?searchtype=author&query=Pokharel%2C+G">Ganesh Pokharel</a>, <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">Jacob P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+E">Eun-Ah Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Seshadri%2C+R">Ram Seshadri</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+S+D">Stephen D. Wilson</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="2211.16602v3-abstract-short" style="display: inline;"> The kagome superconductors KV$_3$Sb$_5$, RbV$_3$Sb$_5$, and CsV$_3$Sb$_5$ are known to display charge density wave (CDW) order which impacts the topological characteristics of their electronic structure. Details of their structural ground states and how they evolve with temperature are revealed here using single crystal X-ray crystallographic refinements as a function of temperature, carried out w… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.16602v3-abstract-full').style.display = 'inline'; document.getElementById('2211.16602v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.16602v3-abstract-full" style="display: none;"> The kagome superconductors KV$_3$Sb$_5$, RbV$_3$Sb$_5$, and CsV$_3$Sb$_5$ are known to display charge density wave (CDW) order which impacts the topological characteristics of their electronic structure. Details of their structural ground states and how they evolve with temperature are revealed here using single crystal X-ray crystallographic refinements as a function of temperature, carried out with synchrotron radiation. The compounds KV$_3$Sb$_5$ and RbV$_3$Sb$_5$ present 2$\times$2$\times$2 superstructures in the $Fmmm$ space group with a staggered tri-hexagonal deformation of vanadium layers. CsV$_3$Sb$_5$ displays more complex structural evolution, whose details have been unravelled by applying machine learning methods to the scattering data. Upon cooling through the CDW transition, CsV$_3$Sb$_5$ displays a staged progression of ordering from a 2$\times$2$\times$1 supercell and a 2$\times$2$\times$2 supercell into a final 2$\times$2$\times$4 supercell that persists to $T$ = 11 K and exhibits an average structure where vanadium layers display both tri-hexagonal and Star of David patterns of deformations. Diffraction from CsV$_3$Sb$_5$ under pulsed magnetic fields up to $渭_0H$ = 28 T suggest the real component of the CDW state is insensitive to external magnetic fields. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.16602v3-abstract-full').style.display = 'none'; document.getElementById('2211.16602v3-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 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">9 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Materials 7 (2023) 024806 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.09247">arXiv:2211.09247</a> <span> [<a href="https://arxiv.org/pdf/2211.09247">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </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.matchar.2023.113174">10.1016/j.matchar.2023.113174 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dark Field X-ray Microscopy Below Liquid-Helium Temperature: The Case of NaMnO2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Plumb%2C+J">Jayden Plumb</a>, <a href="/search/cond-mat?searchtype=author&query=Poudyal%2C+I">Ishwor Poudyal</a>, <a href="/search/cond-mat?searchtype=author&query=Dally%2C+R+L">Rebecca L. Dally</a>, <a href="/search/cond-mat?searchtype=author&query=Daly%2C+S">Samantha Daly</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+S+D">Stephen D. Wilson</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahir Islam</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="2211.09247v1-abstract-short" style="display: inline;"> Dark field X-ray microscopy (DFXM) is an experimental technique employed to investigate material properties by probing their 'mesoscale,' or microscale structures, in a bulk-sensitive manner using hard X-rays at synchrotron radiation sources. However, challenges remain when it comes to applications of this technique to examine low-temperature phenomena in quantum materials, which exhibit complex p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09247v1-abstract-full').style.display = 'inline'; document.getElementById('2211.09247v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.09247v1-abstract-full" style="display: none;"> Dark field X-ray microscopy (DFXM) is an experimental technique employed to investigate material properties by probing their 'mesoscale,' or microscale structures, in a bulk-sensitive manner using hard X-rays at synchrotron radiation sources. However, challenges remain when it comes to applications of this technique to examine low-temperature phenomena in quantum materials, which exhibit complex phase transitions at cryogenic temperatures. One such material is NaMnO2, which hosts an antiferromagnetic transition at 45 K that is suspected to coincide with local structural transitions from its majority monoclinic phase to nanoscale triclinic domains. Direct observation of local heterogeneities and this effect at low temperatures in NaMnO2 is an important step in understanding this material, and serves as an ideal candidate study for expanding the DFXM experimental design space. This paper details a foundational high-resolution DFXM study, down to liquid-helium temperature and below, conducted to explore phase transitions in NaMnO2. The outlined experiment ushers in the evaluation of other functional materials at low temperatures using this technique. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09247v1-abstract-full').style.display = 'none'; document.getElementById('2211.09247v1-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 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">9 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Materials characterization, 2023, Vol. 204, p. 113174 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.15757">arXiv:2210.15757</a> <span> [<a href="https://arxiv.org/pdf/2210.15757">pdf</a>, <a href="https://arxiv.org/format/2210.15757">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> </div> </div> <p class="title is-5 mathjax"> A general method for multiresolutional analysis of mesoscale features in dark-field x-ray microscopy images </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Abulshohoud%2C+O">Omar Abulshohoud</a>, <a href="/search/cond-mat?searchtype=author&query=Poudyal%2C+I">Ishwor Poudyal</a>, <a href="/search/cond-mat?searchtype=author&query=McChesney%2C+J">Jessica McChesney</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+Z">Zhan Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Qiao%2C+Z">Zhi Qiao</a>, <a href="/search/cond-mat?searchtype=author&query=Welp%2C+U">Ulrich Welp</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahir Islam</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.15757v1-abstract-short" style="display: inline;"> Dark-field x-ray microscopy utilizes Bragg diffraction to collect full-field x-ray images of "mesoscale" structure of ordered materials. Information regarding the structural heterogeneities and their physical implications is gleaned through the quantitative analyses of these images. Namely, one must be able to extract diffraction features that arise from lattice modulations or inhomogeneities, qua… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.15757v1-abstract-full').style.display = 'inline'; document.getElementById('2210.15757v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.15757v1-abstract-full" style="display: none;"> Dark-field x-ray microscopy utilizes Bragg diffraction to collect full-field x-ray images of "mesoscale" structure of ordered materials. Information regarding the structural heterogeneities and their physical implications is gleaned through the quantitative analyses of these images. Namely, one must be able to extract diffraction features that arise from lattice modulations or inhomogeneities, quantify said features, and identify and track patterns in the relevant quantitative properties in subsequent images. Due to the necessity to track features with a wide array of shapes and length scales while maintaining spatial resolution, wavelet transforms were chosen as a potent signal analysis tool. In addition to addressing multiple length scales, this method can be used in conjunction with other signal processing methods such as image binarization for increased functionality. In this article, we demonstrate three effective use of wavelet analyses pertaining to DFXM. We show how to extract and track smooth linear features-which are diffraction manifestations of twin boundaries-as the sample orientation changes as it is rotated about momentum transfer. Secondly, we show that even the simplest wavelet transform, the Haar transform, can be used to capture the primary features in DFXM images, over a range of length scales in different regions of interest within a single image enabling localized reconstruction. As a final application, we extend these techniques to determine when a DFXM image is in focus. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.15757v1-abstract-full').style.display = 'none'; document.getElementById('2210.15757v1-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 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.06243">arXiv:2210.06243</a> <span> [<a href="https://arxiv.org/pdf/2210.06243">pdf</a>, <a href="https://arxiv.org/format/2210.06243">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="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Pump-probe Dark-field X-ray Microscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Poudyal%2C+I">Ishwor Poudyal</a>, <a href="/search/cond-mat?searchtype=author&query=Qiao%2C+Z">Zhi Qiao</a>, <a href="/search/cond-mat?searchtype=author&query=Last%2C+A">Arndt Last</a>, <a href="/search/cond-mat?searchtype=author&query=Armstrong%2C+M+R">Michael R. Armstrong</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahir Islam</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.06243v3-abstract-short" style="display: inline;"> A pump-probe dark-field X-ray microscopy (DFXM) experiment was carried out at the Advanced Photon Source (APS) with nanosecond drive laser pulses and hybrid mode X-ray probe pulses. We observe a thermal decay due to laser-induced heat diffusion in a Germanium single crystal which matches the theoretical prediction. The single pulse DFXM imaging in combination with the laser-pump X-ray probe method… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.06243v3-abstract-full').style.display = 'inline'; document.getElementById('2210.06243v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.06243v3-abstract-full" style="display: none;"> A pump-probe dark-field X-ray microscopy (DFXM) experiment was carried out at the Advanced Photon Source (APS) with nanosecond drive laser pulses and hybrid mode X-ray probe pulses. We observe a thermal decay due to laser-induced heat diffusion in a Germanium single crystal which matches the theoretical prediction. The single pulse DFXM imaging in combination with the laser-pump X-ray probe method could reveal thermal strain formation and propagation of the acoustic wave "on-the-fly" generated by a laser-induced lattice deformation. This will open a new avenue of materials research on laser-induced dynamic phenomena in solids at sub-nanosecond time scales. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.06243v3-abstract-full').style.display = 'none'; document.getElementById('2210.06243v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Updated Author list on the page consistent with the pdf</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.02642">arXiv:2209.02642</a> <span> [<a href="https://arxiv.org/pdf/2209.02642">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Multiscale reduced-order modeling of fused filament fabricated composites </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mojumder%2C+S">Satyajit Mojumder</a>, <a href="/search/cond-mat?searchtype=author&query=van+Beek%2C+A">Anton van Beek</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahabul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Qian%2C+D">Dong Qian</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+W+K">Wing Kam Liu</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="2209.02642v1-abstract-short" style="display: inline;"> Defects such as voids are observed at multiple length scales of an additively manufactured composite material. Modeling such defects and their multiscale interaction is crucial for the materials performance prediction. In this work, we study as-built defects in fused filament fabricated Polycarbonate/Short Carbon Fiber (PC/SCF) composite samples. The microscale and mesoscale voids along with the m… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.02642v1-abstract-full').style.display = 'inline'; document.getElementById('2209.02642v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.02642v1-abstract-full" style="display: none;"> Defects such as voids are observed at multiple length scales of an additively manufactured composite material. Modeling such defects and their multiscale interaction is crucial for the materials performance prediction. In this work, we study as-built defects in fused filament fabricated Polycarbonate/Short Carbon Fiber (PC/SCF) composite samples. The microscale and mesoscale voids along with the mesoscale layer orientations have been studied using a mechanistic reduced-order model. Our result indicates that the microscale intrabead voids interact with the mesoscale interbead voids and significantly degrade the mechanical response of the printed composites compared to the microscale microstructure without voids. The mesoscale layer orientations also influence the stress-strain response and show better performance when the load is applied to the bead direction. The efficient reduced-order modeling approach used in this work provides a way to evaluate multiscale design aspects of additively manufactured composite materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.02642v1-abstract-full').style.display = 'none'; document.getElementById('2209.02642v1-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 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">13 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/2207.13221">arXiv:2207.13221</a> <span> [<a href="https://arxiv.org/pdf/2207.13221">pdf</a>, <a href="https://arxiv.org/ps/2207.13221">ps</a>, <a href="https://arxiv.org/format/2207.13221">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"> Multimodal synchrotron X-ray diffraction across the superconducting transition of Sr$_{0.1}$Bi$_2$Se$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Smylie%2C+M+P">M. P. Smylie</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</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=Schneeloch%2C+J">J. Schneeloch</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+R+D">R. D. Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Rosenkranz%2C+S">S. Rosenkranz</a>, <a href="/search/cond-mat?searchtype=author&query=Kwok%2C+W+-">W. -K. Kwok</a>, <a href="/search/cond-mat?searchtype=author&query=Welp%2C+U">U. Welp</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.13221v1-abstract-short" style="display: inline;"> In the doped topological insulator Sr$_x$Bi$_2$Se$_3$, a pronounced in-plane two-fold symmetry is observed in electronic properties below the superconducting transition temperature $T_c \sim$ 3 K, despite the three-fold symmetry of the observed $R\bar{3}m$ space group. The axis of two-fold symmetry is nominally pinned to one of three rotational equivalent directions and crystallographic strain has… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.13221v1-abstract-full').style.display = 'inline'; document.getElementById('2207.13221v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.13221v1-abstract-full" style="display: none;"> In the doped topological insulator Sr$_x$Bi$_2$Se$_3$, a pronounced in-plane two-fold symmetry is observed in electronic properties below the superconducting transition temperature $T_c \sim$ 3 K, despite the three-fold symmetry of the observed $R\bar{3}m$ space group. The axis of two-fold symmetry is nominally pinned to one of three rotational equivalent directions and crystallographic strain has been proposed to be the origin of this pinning. We carried out multimodal synchrotron diffraction and resistivity measurements down to $\sim$0.68 K and in magnetic fields up to 45 kG on a single crystal of Sr$_{0.1}$Bi$_2$Se$_3$ to probe the effect of superconductivity on the crystallographic distortion. Our results indicate that there is no in-plane crystallographic distortion at the level of $1x10^{-5}$ associated with the superconducting transition. These results further support the model that the large two-fold in-plane anisotropy of superconducting properties of Sr$_x$Bi$_2$Sr$_3$ is not structural in origin but electronic, namely it is caused by a nematic superconducting order parameter of Eu symmetry. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.13221v1-abstract-full').style.display = 'none'; document.getElementById('2207.13221v1-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 6 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/2207.02634">arXiv:2207.02634</a> <span> [<a href="https://arxiv.org/pdf/2207.02634">pdf</a>, <a href="https://arxiv.org/format/2207.02634">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"> Nanometric modulations of the magnetic structure of the element Nd </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Arachchige%2C+H+S">H. Suriya Arachchige</a>, <a href="/search/cond-mat?searchtype=author&query=DeBeer-Schmitt%2C+L+M">L. M. DeBeer-Schmitt</a>, <a href="/search/cond-mat?searchtype=author&query=Kish%2C+L+L">L. L. Kish</a>, <a href="/search/cond-mat?searchtype=author&query=Rai%2C+B+K">Binod K. Rai</a>, <a href="/search/cond-mat?searchtype=author&query=May%2C+A+F">A. F. May</a>, <a href="/search/cond-mat?searchtype=author&query=Parker%2C+D+S">D. S. Parker</a>, <a href="/search/cond-mat?searchtype=author&query=Pokharel%2C+G">G. Pokharel</a>, <a href="/search/cond-mat?searchtype=author&query=Tian%2C+W">Wei Tian</a>, <a href="/search/cond-mat?searchtype=author&query=Mandrus%2C+D+G">D. G. Mandrus</a>, <a href="/search/cond-mat?searchtype=author&query=Bleuel%2C+M">M. Bleuel</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Fabbris%2C+G">G. Fabbris</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+H+X">H. X. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+S">S. Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Miao%2C+H">H. Miao</a>, <a href="/search/cond-mat?searchtype=author&query=Thomas%2C+S+M">S. M. Thomas</a>, <a href="/search/cond-mat?searchtype=author&query=Rosa%2C+P+F+S">P. F. S. Rosa</a>, <a href="/search/cond-mat?searchtype=author&query=Thompson%2C+J+D">J. D. Thompson</a>, <a href="/search/cond-mat?searchtype=author&query=Lin%2C+S">Shi-Zeng Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Christianson%2C+A+D">A. D. Christianson</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.02634v1-abstract-short" style="display: inline;"> The rare earth neodymium arguably exhibits the most complex magnetic ordering and series of magnetic phase transitions of the elements. Here we report the results of small-angle neutron scattering (SANS) measurements as a function of temperature and applied magnetic field to study magnetic correlations on nanometer length scales in Nd. The SANS measurements reveal the presence of previously unrepo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.02634v1-abstract-full').style.display = 'inline'; document.getElementById('2207.02634v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.02634v1-abstract-full" style="display: none;"> The rare earth neodymium arguably exhibits the most complex magnetic ordering and series of magnetic phase transitions of the elements. Here we report the results of small-angle neutron scattering (SANS) measurements as a function of temperature and applied magnetic field to study magnetic correlations on nanometer length scales in Nd. The SANS measurements reveal the presence of previously unreported modulation vectors characterizing the ordered spin configuration which exhibit changes in magnitude and direction that are phase dependent. Between 5.9 and 7.6 K the additional modulation vector has a magnitude $Q$ =0.12 脜$^{-1}$ and is primarily due to order of the Nd layers which contain a center of inversion. In this region of the phase diagram, the SANS measurements also identify a phase boundary at $\approx$1 T. An important feature of these modulation vectors is that they indicate the presence of nanometer length scale spin textures which are likely stabilized by frustrated Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions rather than a Dzyaloshinskii-Moriya (DM) exchange interaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.02634v1-abstract-full').style.display = 'none'; document.getElementById('2207.02634v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 15 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.13102">arXiv:2203.13102</a> <span> [<a href="https://arxiv.org/pdf/2203.13102">pdf</a>, <a href="https://arxiv.org/ps/2203.13102">ps</a>, <a href="https://arxiv.org/format/2203.13102">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Magnetic Excitations in Square Lattice Iridates: Contrast between Ba$_2$IrO$_4$ and Sr$_2$IrO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Clancy%2C+J+P">J. P. Clancy</a>, <a href="/search/cond-mat?searchtype=author&query=Gretarsson%2C+H">H. Gretarsson</a>, <a href="/search/cond-mat?searchtype=author&query=Lupascu%2C+A">A. Lupascu</a>, <a href="/search/cond-mat?searchtype=author&query=Sears%2C+J+A">J. A. Sears</a>, <a href="/search/cond-mat?searchtype=author&query=Nie%2C+Z">Z. Nie</a>, <a href="/search/cond-mat?searchtype=author&query=Upton%2C+M+H">M. H. Upton</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+J">Jungho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Uchida%2C+M">M. Uchida</a>, <a href="/search/cond-mat?searchtype=author&query=Schlom%2C+D+G">D. G. Schlom</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+K+M">K. M. Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+Y">Young-June Kim</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="2203.13102v1-abstract-short" style="display: inline;"> We report a resonant inelastic x-ray scattering (RIXS) investigation of ultra-thin epitaxial films of Ba$_2$IrO$_4$, and compare their low energy magnetic and spin-orbit excitations to those of their sister compound Sr$_2$IrO$_4$. Due to the 180$^\circ$ Ir-O-Ir bond, the bandwidth of the magnon and spin-orbiton is significantly larger in Ba$_2$IrO$_4$, making it difficult to describe these two typ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.13102v1-abstract-full').style.display = 'inline'; document.getElementById('2203.13102v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.13102v1-abstract-full" style="display: none;"> We report a resonant inelastic x-ray scattering (RIXS) investigation of ultra-thin epitaxial films of Ba$_2$IrO$_4$, and compare their low energy magnetic and spin-orbit excitations to those of their sister compound Sr$_2$IrO$_4$. Due to the 180$^\circ$ Ir-O-Ir bond, the bandwidth of the magnon and spin-orbiton is significantly larger in Ba$_2$IrO$_4$, making it difficult to describe these two types of excitations as separate well-defined quasiparticles. Both types of excitations are found to be quite sensitive to the effect of epitaxial strain. In addition, we find that the d-level inversion observed in Sr$_2$IrO$_4$ is absent in Ba$_2$IrO$_4$, as predicted in recent theoretical studies. Our results illustrate that the magnetic properties of Ba$_2$IrO$_4$ are substantially different from those of Sr$_2$IrO$_4$, suggesting that these materials need to be examined more carefully with electron itinerancy taken into account. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.13102v1-abstract-full').style.display = 'none'; document.getElementById('2203.13102v1-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 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">7 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/2103.12979">arXiv:2103.12979</a> <span> [<a href="https://arxiv.org/pdf/2103.12979">pdf</a>, <a href="https://arxiv.org/format/2103.12979">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.103.224420">10.1103/PhysRevB.103.224420 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Structural and Magnetic Transitions in the Planar Antiferromagnet Ba$_4$Ir$_3$O$_{10}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X">Xiang Chen</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu He</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Shan Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu Song</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+D">Dongsheng Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Bourret-Courchesne%2C+E">Edith Bourret-Courchesne</a>, <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">Jacob P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Frano%2C+A">Alex Frano</a>, <a href="/search/cond-mat?searchtype=author&query=Birgeneau%2C+R+J">Robert J. Birgeneau</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="2103.12979v1-abstract-short" style="display: inline;"> We report the structural and magnetic ground state properties of the monoclinic compound barium iridium oxide Ba$_4$Ir$_3$O$_{10}$ using a combination of resonant x-ray scattering, magnetometry, and thermodynamic techniques. Magnetic susceptibility exhibits a pronounced antiferromagnetic transition at $T_{\text{N}}$ $\approx$ 25K, a weaker anomaly at $T_{\text{S}}$ $\approx$ 142K, and strong magne… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.12979v1-abstract-full').style.display = 'inline'; document.getElementById('2103.12979v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.12979v1-abstract-full" style="display: none;"> We report the structural and magnetic ground state properties of the monoclinic compound barium iridium oxide Ba$_4$Ir$_3$O$_{10}$ using a combination of resonant x-ray scattering, magnetometry, and thermodynamic techniques. Magnetic susceptibility exhibits a pronounced antiferromagnetic transition at $T_{\text{N}}$ $\approx$ 25K, a weaker anomaly at $T_{\text{S}}$ $\approx$ 142K, and strong magnetic anisotropy at all temperatures. Resonant elastic x-ray scattering experiments reveal a second order structural phase transition at $T_{\text{S}}$ and a magnetic transition at $T_{\text{N}}$. Both structural and magnetic superlattice peaks are observed at $L$ = half integer values. The magnetization anomaly at $T_{\text{S}}$ implies the presence of magneto-elastic coupling, which conceivably facilitates the symmetry lowering. Mean field critical scattering is observed above $T_{\text{S}}$. The magnetic structure of the antiferromagnetic ground state is discussed based on the measured magnetic superlattice peak intensity. Our study not only presents essential information for understanding the intertwined structural and magnetic properties in Ba$_4$Ir$_3$O$_{10}$, but also highlights the necessary ingredients for exploring novel ground states with octahedra trimers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.12979v1-abstract-full').style.display = 'none'; document.getElementById('2103.12979v1-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 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">Submitted. Comments are welcome</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.11103">arXiv:1905.11103</a> <span> [<a href="https://arxiv.org/pdf/1905.11103">pdf</a>, <a href="https://arxiv.org/format/1905.11103">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.100.041108">10.1103/PhysRevB.100.041108 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Phase transition preceding magnetic long-range order in the double perovskite Ba2NaOsO6 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Willa%2C+K">Kristin Willa</a>, <a href="/search/cond-mat?searchtype=author&query=Willa%2C+R">Roland Willa</a>, <a href="/search/cond-mat?searchtype=author&query=Welp%2C+U">Ulrich Welp</a>, <a href="/search/cond-mat?searchtype=author&query=Fisher%2C+I+R">Ian R. Fisher</a>, <a href="/search/cond-mat?searchtype=author&query=Rydh%2C+A">Andreas Rydh</a>, <a href="/search/cond-mat?searchtype=author&query=Kwok%2C+W">Wai-Kwong Kwok</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahir Islam</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="1905.11103v1-abstract-short" style="display: inline;"> Recent theoretical studies [Chen et al., Phys. Rev. B 82, 174440 (2010), Ishizuka et al., Phys. Rev. B 90, 184422 (2014)] for the magnetic Mott insulator Ba2NaOsO6 have proposed a low-temperature order parameter that breaks lattice rotational symmetry without breaking time reversal symmetry leading to a nematic phase just above magnetic ordering temperature. We present high-resolution calorimetric… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.11103v1-abstract-full').style.display = 'inline'; document.getElementById('1905.11103v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.11103v1-abstract-full" style="display: none;"> Recent theoretical studies [Chen et al., Phys. Rev. B 82, 174440 (2010), Ishizuka et al., Phys. Rev. B 90, 184422 (2014)] for the magnetic Mott insulator Ba2NaOsO6 have proposed a low-temperature order parameter that breaks lattice rotational symmetry without breaking time reversal symmetry leading to a nematic phase just above magnetic ordering temperature. We present high-resolution calorimetric and magnetization data of the same Ba2NaOsO6 single crystal and show evidence for a weakly field-dependent phase transition occurring at a temperature of Ts ~ 9.5K, above the magnetic ordering temperature of Tc ~ 7.5K. This transition appears as a broadened step in the low-field temperature dependence of the specific heat. The evolution of the phase boundary with applied magnetic field suggests that this phase coincides with the phase of broken local point symmetry seen in high field NMR experiments [Lu et al., Nat.\ Comm. 8 14407 (2017)]. Furthermore, the magnetic field dependence of the specific heat provides clear indications for magnetic correlations persisting at temperatures between Tc and Ts where long-range magnetic order is absent giving support for the existence of the proposed nematic phase. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.11103v1-abstract-full').style.display = 'none'; document.getElementById('1905.11103v1-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 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 100, 041108 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1903.06115">arXiv:1903.06115</a> <span> [<a href="https://arxiv.org/pdf/1903.06115">pdf</a>, <a href="https://arxiv.org/format/1903.06115">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/PhysRevLett.122.157201">10.1103/PhysRevLett.122.157201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Overdamped antiferromagnetic strange metal state in Sr$_3$IrRuO$_7$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Schmehr%2C+J+L">Julian L. Schmehr</a>, <a href="/search/cond-mat?searchtype=author&query=Mion%2C+T+R">Thomas R. Mion</a>, <a href="/search/cond-mat?searchtype=author&query=Porter%2C+Z">Zach Porter</a>, <a href="/search/cond-mat?searchtype=author&query=Aling%2C+M">Michael Aling</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+H">Huibo Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Upton%2C+M+H">Mary H. Upton</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+R">Rui-Hua He</a>, <a href="/search/cond-mat?searchtype=author&query=Sensarma%2C+R">Rajdeep Sensarma</a>, <a href="/search/cond-mat?searchtype=author&query=Trivedi%2C+N">Nandini Trivedi</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+S+D">Stephen D. Wilson</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="1903.06115v1-abstract-short" style="display: inline;"> The unconventional electronic ground state of Sr$_3$IrRuO$_7$ is explored via resonant x-ray scattering techniques and angle-resolved photoemission measurements. As the Ru content approaches $x=0.5$ in Sr$_3$(Ir$_{1-x}$Ru$_x$)$_2$O$_7$, intermediate to the $J_{eff}=1/2$ Mott state in Sr$_3$Ir$_2$O$_7$ and the quantum critical metal in Sr$_3$Ru$_2$O$_7$, a thermodynamically distinct metallic state… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.06115v1-abstract-full').style.display = 'inline'; document.getElementById('1903.06115v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1903.06115v1-abstract-full" style="display: none;"> The unconventional electronic ground state of Sr$_3$IrRuO$_7$ is explored via resonant x-ray scattering techniques and angle-resolved photoemission measurements. As the Ru content approaches $x=0.5$ in Sr$_3$(Ir$_{1-x}$Ru$_x$)$_2$O$_7$, intermediate to the $J_{eff}=1/2$ Mott state in Sr$_3$Ir$_2$O$_7$ and the quantum critical metal in Sr$_3$Ru$_2$O$_7$, a thermodynamically distinct metallic state emerges. The electronic structure of this intermediate phase lacks coherent quasiparticles, and charge transport exhibits a linear temperature dependence over a wide range of temperatures. Spin dynamics associated with the long-range antiferromagnetism of this phase show nearly local, overdamped magnetic excitations and an anomalously large energy scale of 200 meV---an energy far in excess of exchange energies present within either the Sr$_3$Ir$_2$O$_7$ or Sr$_3$Ru$_2$O$_7$ solid-solution endpoints. Overdamped quasiparticle dynamics driven by strong spin-charge coupling are proposed to explain the incoherent spectral features of the strange metal state in Sr$_3$IrRuO$_7$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.06115v1-abstract-full').style.display = 'none'; document.getElementById('1903.06115v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">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. Lett. 122, 157201 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.08146">arXiv:1901.08146</a> <span> [<a href="https://arxiv.org/pdf/1901.08146">pdf</a>, <a href="https://arxiv.org/format/1901.08146">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.99.134417">10.1103/PhysRevB.99.134417 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Revisiting the Kitaev material candidacy of Ir4+ double perovskite iridates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Aczel%2C+A+A">A. A. Aczel</a>, <a href="/search/cond-mat?searchtype=author&query=Clancy%2C+J+P">J. P. Clancy</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Q">Q. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+H+D">H. D. Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Reig-i-Plessis%2C+D">D. Reig-i-Plessis</a>, <a href="/search/cond-mat?searchtype=author&query=MacDougall%2C+G+J">G. J. MacDougall</a>, <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">J. P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Upton%2C+M+H">M. H. Upton</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Williams%2C+T+J">T. J. Williams</a>, <a href="/search/cond-mat?searchtype=author&query=Calder%2C+S">S. Calder</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+J+-">J. -Q. Yan</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="1901.08146v2-abstract-short" style="display: inline;"> Quantum magnets with significant bond-directional Ising interactions, so-called Kitaev materials, have attracted tremendous attention recently in the search for exotic spin liquid states. Here we present a comprehensive set of measurements that enables us to investigate the crystal structures, Ir$^{4+}$ single ion properties, and magnetic ground states of the double perovskite iridates La$_2B$IrO… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.08146v2-abstract-full').style.display = 'inline'; document.getElementById('1901.08146v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.08146v2-abstract-full" style="display: none;"> Quantum magnets with significant bond-directional Ising interactions, so-called Kitaev materials, have attracted tremendous attention recently in the search for exotic spin liquid states. Here we present a comprehensive set of measurements that enables us to investigate the crystal structures, Ir$^{4+}$ single ion properties, and magnetic ground states of the double perovskite iridates La$_2B$IrO$_6$ ($B$ $=$ Mg, Zn) and $A_2$CeIrO$_6$ ($A$ $=$ Ba, Sr) with a large nearest neighbor distance $>$ 5 Angstroms between Ir$^{4+}$ ions. Our neutron powder diffraction data on Ba$_2$CeIrO$_6$ can be refined in the cubic space group Fm$\bar{3}$m, while the other three systems are characterized by weak monoclinic structural distortions. Despite the variance in the non-cubic crystal field experienced by the Ir$^{4+}$ ions in these materials, X-ray absorption spectroscopy and resonant inelastic x-ray scattering are consistent with $J_{\rm eff}$ $=$ 1/2 moments in all cases. Furthermore, neutron scattering and resonant magnetic x-ray scattering show that these systems host A-type antiferromagnetic order. These electronic and magnetic ground states are consistent with expectations for face-centered-cubic magnets with significant antiferromagnetic Kitaev exchange, which indicates that spacing magnetic ions far apart may be a promising design principle for uncovering additional Kitaev materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.08146v2-abstract-full').style.display = 'none'; document.getElementById('1901.08146v2-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 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 7 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 99, 134417 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.05984">arXiv:1808.05984</a> <span> [<a href="https://arxiv.org/pdf/1808.05984">pdf</a>, <a href="https://arxiv.org/format/1808.05984">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/10.1073/pnas.1817134116">10.1073/pnas.1817134116 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Disorder raises the critical temperature of a cuprate superconductor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Leroux%2C+M">Maxime Leroux</a>, <a href="/search/cond-mat?searchtype=author&query=Mishra%2C+V">Vivek Mishra</a>, <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">Jacob P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Claus%2C+H">Helmut Claus</a>, <a href="/search/cond-mat?searchtype=author&query=Smylie%2C+M+P">Matthew P. Smylie</a>, <a href="/search/cond-mat?searchtype=author&query=Opagiste%2C+C">Christine Opagiste</a>, <a href="/search/cond-mat?searchtype=author&query=Rodi%C3%A8re%2C+P">Pierre Rodi猫re</a>, <a href="/search/cond-mat?searchtype=author&query=Kayani%2C+A">Asghar Kayani</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=Tranquada%2C+J+M">John M. Tranquada</a>, <a href="/search/cond-mat?searchtype=author&query=Kwok%2C+W">Wai-Kwong Kwok</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Welp%2C+U">Ulrich Welp</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="1808.05984v2-abstract-short" style="display: inline;"> With the discovery of charge density waves (CDW) in most members of the cuprate high temperature superconductors, the interplay between superconductivity and CDW has become a key point in the debate on the origin of high temperature superconductivity. Some experiments in cuprates point toward a CDW state competing with superconductivity, but others raise the possibility of a CDW-superconductivity… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.05984v2-abstract-full').style.display = 'inline'; document.getElementById('1808.05984v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.05984v2-abstract-full" style="display: none;"> With the discovery of charge density waves (CDW) in most members of the cuprate high temperature superconductors, the interplay between superconductivity and CDW has become a key point in the debate on the origin of high temperature superconductivity. Some experiments in cuprates point toward a CDW state competing with superconductivity, but others raise the possibility of a CDW-superconductivity intertwined order, or more elusive pair-density wave (PDW). Here we have used proton irradiation to induce disorder in crystals of La$_{1.875}$Ba$_{0.125}$CuO$_4$ and observed a striking 50% increase of $T_\mathrm{c}$ accompanied by a suppression of the CDW. This is in clear contradiction with the behaviour expected of a d-wave superconductor for which both magnetic and non-magnetic defects should suppress $T_\mathrm{c}$. Our results thus make an unambiguous case for the strong detrimental effect of the CDW on bulk superconductivity in La$_{1.875}$Ba$_{0.125}$CuO$_4$. Using tunnel diode oscillator (TDO) measurements, we find evidence for dynamic layer decoupling in PDW phase. Our results establish irradiation-induced disorder as a particularly relevant tuning parameter for the many families of superconductors with coexisting density waves, which we demonstrate on superconductors such as the dichalcogenides and Lu$_5$Ir$_4$Si$_{10}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.05984v2-abstract-full').style.display = 'none'; document.getElementById('1808.05984v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">10 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Proceedings of the National Academy of Sciences May 2019, 201817134 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1805.04216">arXiv:1805.04216</a> <span> [<a href="https://arxiv.org/pdf/1805.04216">pdf</a>, <a href="https://arxiv.org/ps/1805.04216">ps</a>, <a href="https://arxiv.org/format/1805.04216">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.98.104503">10.1103/PhysRevB.98.104503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anisotropic superconductivity and magnetism in single-crystal RbEuFe$_4$As$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Smylie%2C+M+P">M. P. Smylie</a>, <a href="/search/cond-mat?searchtype=author&query=Willa%2C+K">K. Willa</a>, <a href="/search/cond-mat?searchtype=author&query=Bao%2C+J+-">J. -K. Bao</a>, <a href="/search/cond-mat?searchtype=author&query=Ryan%2C+K">K. Ryan</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Claus%2C+H">H. Claus</a>, <a href="/search/cond-mat?searchtype=author&query=Simsek%2C+Y">Y. Simsek</a>, <a href="/search/cond-mat?searchtype=author&query=Diao%2C+Z">Z. Diao</a>, <a href="/search/cond-mat?searchtype=author&query=Rydh%2C+A">A. Rydh</a>, <a href="/search/cond-mat?searchtype=author&query=Koshelev%2C+A+E">A. E. Koshelev</a>, <a href="/search/cond-mat?searchtype=author&query=Kwok%2C+W+-">W. -K. Kwok</a>, <a href="/search/cond-mat?searchtype=author&query=Chung%2C+D+Y">D. Y. Chung</a>, <a href="/search/cond-mat?searchtype=author&query=Kanatzidis%2C+M+G">M. G. Kanatzidis</a>, <a href="/search/cond-mat?searchtype=author&query=Welp%2C+U">U. Welp</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="1805.04216v1-abstract-short" style="display: inline;"> We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe$_4$As$_4$ using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu-moments of $T_m$ = 15 K and a superconducting transition temperature of $T_c$ = 36.8 K. The superconducting phase diagram is characterized by high upper critical field slopes of -70 kG… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.04216v1-abstract-full').style.display = 'inline'; document.getElementById('1805.04216v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.04216v1-abstract-full" style="display: none;"> We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe$_4$As$_4$ using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu-moments of $T_m$ = 15 K and a superconducting transition temperature of $T_c$ = 36.8 K. The superconducting phase diagram is characterized by high upper critical field slopes of -70 kG/K and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of $螕$ = 1.7. Ginzburg-Landau parameters of $魏_c \sim 67$ and $魏_{ab} \sim 108$ indicate extreme type-II behavior. These superconducting properties are in line with those commonly seen in optimally doped Fe-based superconductors. In contrast, Eu-magnetism is quasi-two dimensional as evidenced by highly anisotropic in-plane and out-of-plane exchange constants of 0.6 K and $<$ 0.04 K. A consequence of the quasi-2D nature of the Eu-magnetism are strong magnetic fluctuation effects, a large suppression of the magnetic ordering temperature as compared to the Curie-Weiss temperature, and a cusp-like anomaly in the specific heat devoid of any singularity. Magnetization curves reveal a clear magnetic easy-plane anisotropy with in-plane and out-of-plane saturation fields of 2 kG and 4 kG. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.04216v1-abstract-full').style.display = 'none'; document.getElementById('1805.04216v1-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 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">9 pages, 9 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 98, 104503 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1801.03076">arXiv:1801.03076</a> <span> [<a href="https://arxiv.org/pdf/1801.03076">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-017-02647-1">10.1038/s41467-017-02647-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unidirectional spin density wave state in metallic (Sr1-xLax)2IrO4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X">Xiang Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Schmehr%2C+J+L">Julian L. Schmehr</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Porter%2C+Z">Zach Porter</a>, <a href="/search/cond-mat?searchtype=author&query=Zoghlin%2C+E">Eli Zoghlin</a>, <a href="/search/cond-mat?searchtype=author&query=Finkelstein%2C+K">Kenneth Finkelstein</a>, <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">Jacob P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+S+D">Stephen D Wilson</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="1801.03076v1-abstract-short" style="display: inline;"> Materials that exhibit both strong spin orbit coupling and electron correlation effects are predicted to host numerous new electronic states. One prominent example is the Jeff =1/2 Mott state in Sr2IrO4, where introducing carriers is predicted to manifest high temperature superconductivity analogous to the S=1/2 Mott state of La2CuO4. While bulk superconductivity currently remains elusive, anomalo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.03076v1-abstract-full').style.display = 'inline'; document.getElementById('1801.03076v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.03076v1-abstract-full" style="display: none;"> Materials that exhibit both strong spin orbit coupling and electron correlation effects are predicted to host numerous new electronic states. One prominent example is the Jeff =1/2 Mott state in Sr2IrO4, where introducing carriers is predicted to manifest high temperature superconductivity analogous to the S=1/2 Mott state of La2CuO4. While bulk superconductivity currently remains elusive, anomalous quasi-particle behaviors paralleling those in the cuprates such as pseudogap formation and the formation of a d-wave gap are observed upon electron-doping Sr2IrO4. Here we establish a magnetic parallel between electron-doped Sr2IrO4 and hole-doped La2CuO4 by unveiling a spin density wave state in electron-doped Sr2IrO4. Our magnetic resonant x-ray scattering data reveal the presence of an incommensurate magnetic state reminiscent of the diagonal spin density wave state observed in the monolayer cuprate (La1-xSrx)2CuO4. This link supports the conjecture that the quenched Mott phases in electron-doped Sr2IrO4 and hole-doped La2CuO4 support common competing electronic phases. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.03076v1-abstract-full').style.display = 'none'; document.getElementById('1801.03076v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 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">Supplementary Information available online. Comments and thoughts are welcome</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> NATURE COMMUNICATIONS | (2018) 9:103 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.03215">arXiv:1712.03215</a> <span> [<a href="https://arxiv.org/pdf/1712.03215">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> <p class="title is-5 mathjax"> Superconducting and normal-state anisotropy of the doped topological insulator Sr$_{0.1}$Bi$_2$Se$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Smylie%2C+M+P">M. P. Smylie</a>, <a href="/search/cond-mat?searchtype=author&query=Willa%2C+K">K. Willa</a>, <a href="/search/cond-mat?searchtype=author&query=Claus%2C+H">H. Claus</a>, <a href="/search/cond-mat?searchtype=author&query=Koshelev%2C+A+E">A. E. Koshelev</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+K+W">K. W. Song</a>, <a href="/search/cond-mat?searchtype=author&query=Kwok%2C+W+-">W. -K. Kwok</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</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=Schneeloch%2C+J+A">J. A. Schneeloch</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+R+D">R. D. Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Welp%2C+U">U. Welp</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="1712.03215v1-abstract-short" style="display: inline;"> Sr$_x$Bi$_2$Se$_3$ and the related compounds Cu$_x$Bi$_2$Se$_3$ and Nb$_x$Bi$_2$Se$_3$ have attracted considerable interest, as these materials may be realizations of unconventional topological superconductors. Superconductivity with T$_c$ ~ 3 K in Sr$_x$Bi$_2$Se$_3$ arises upon intercalation of Sr into the layered topological insulator Bi$_2$Se$_3$. Here we elucidate the anisotropy of the normal… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.03215v1-abstract-full').style.display = 'inline'; document.getElementById('1712.03215v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.03215v1-abstract-full" style="display: none;"> Sr$_x$Bi$_2$Se$_3$ and the related compounds Cu$_x$Bi$_2$Se$_3$ and Nb$_x$Bi$_2$Se$_3$ have attracted considerable interest, as these materials may be realizations of unconventional topological superconductors. Superconductivity with T$_c$ ~ 3 K in Sr$_x$Bi$_2$Se$_3$ arises upon intercalation of Sr into the layered topological insulator Bi$_2$Se$_3$. Here we elucidate the anisotropy of the normal and superconducting state of Sr$_{0.1}$Bi$_2$Se$_3$ with angular dependent magnetotransport and thermodynamic measurements. High resolution x-ray diffraction studies underline the high crystalline quality of the samples. We demonstrate that the normal state electronic and magnetic properties of Sr$_{0.1}$Bi$_2$Se$_3$ are isotropic in the basal plane while we observe a large two-fold in-plane anisotropy of the upper critical field in the superconducting state. Our results support the recently proposed odd-parity nematic state characterized by a nodal gap of $E_u$ symmetry in Sr$_x$Bi$_2$Se$_3$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.03215v1-abstract-full').style.display = 'none'; document.getElementById('1712.03215v1-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 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 7 figures, 3 supplemental pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1707.00589">arXiv:1707.00589</a> <span> [<a href="https://arxiv.org/pdf/1707.00589">pdf</a>, <a href="https://arxiv.org/format/1707.00589">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/PhysRevLett.120.197001">10.1103/PhysRevLett.120.197001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantitative characterization of the nanoscale local lattice strain induced by Sr dopants in La$_{1.92}$Sr$_{0.08}$CuO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lin%2C+J+Q">J. Q. Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+X">X. Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Blackburn%2C+E">E. Blackburn</a>, <a href="/search/cond-mat?searchtype=author&query=Wakimoto%2C+S">S. Wakimoto</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+H">H. Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Sinha%2C+S+K">S. K. Sinha</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="1707.00589v2-abstract-short" style="display: inline;"> The nanometer scale lattice deformation brought about by the dopants in high temperature superconducting cuprate La$_{2-x}$Sr$_x$CuO$_4$(x=0.08) was investigated by measuring the associated X-ray diffuse scattering around multiple Bragg peaks. A characteristic diffuse scattering pattern was observed, which can be well described by continuum elastic theory. With the fitted dipole force parameters,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.00589v2-abstract-full').style.display = 'inline'; document.getElementById('1707.00589v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1707.00589v2-abstract-full" style="display: none;"> The nanometer scale lattice deformation brought about by the dopants in high temperature superconducting cuprate La$_{2-x}$Sr$_x$CuO$_4$(x=0.08) was investigated by measuring the associated X-ray diffuse scattering around multiple Bragg peaks. A characteristic diffuse scattering pattern was observed, which can be well described by continuum elastic theory. With the fitted dipole force parameters, the acoustic type lattice deformation pattern was re-constructed and found to be of similar size to lattice thermal vibration at 7 K. Our results address the long-term concern of dopant introduced local lattice inhomogeneity, and show that the associated nanometer scale lattice deformation is marginal and cannot, alone, be responsible for the patched variation in the spectral gaps observed with scanning tunneling microscopy in the cuprates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.00589v2-abstract-full').style.display = 'none'; document.getElementById('1707.00589v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 July, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">5 pages, 4 figures, accepted by PRL</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 120, 197001 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.02531">arXiv:1703.02531</a> <span> [<a href="https://arxiv.org/pdf/1703.02531">pdf</a>, <a href="https://arxiv.org/format/1703.02531">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-017-01071-9">10.1038/s41467-017-01071-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Field-induced intertwined orders in 3D Mott-Kitaev honeycomb $尾$-Li2IrO3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ruiz%2C+A">Alejandro Ruiz</a>, <a href="/search/cond-mat?searchtype=author&query=Frano%2C+A">Alex Frano</a>, <a href="/search/cond-mat?searchtype=author&query=Breznay%2C+N+P">Nicholas P. Breznay</a>, <a href="/search/cond-mat?searchtype=author&query=Kimchi%2C+I">Itamar Kimchi</a>, <a href="/search/cond-mat?searchtype=author&query=Helm%2C+T">Toni Helm</a>, <a href="/search/cond-mat?searchtype=author&query=Oswald%2C+I">Iain Oswald</a>, <a href="/search/cond-mat?searchtype=author&query=Chan%2C+J+Y">Julia Y. Chan</a>, <a href="/search/cond-mat?searchtype=author&query=Birgeneau%2C+R+J">R. J. Birgeneau</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Analytis%2C+J+G">James G. Analytis</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1703.02531v1-abstract-short" style="display: inline;"> Honeycomb iridates are thought to have strongly spin-anisotropic exchange interactions that could lead to an extraordinary state of matter known as the Kitaev quantum spin liquid. The realization of this state requires almost perfectly frustrated interactions between the magnetic Ir$^{4+}$ ions, but small imbalances in energy make other ordered states more favorable. Indeed, the closeness in energ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.02531v1-abstract-full').style.display = 'inline'; document.getElementById('1703.02531v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.02531v1-abstract-full" style="display: none;"> Honeycomb iridates are thought to have strongly spin-anisotropic exchange interactions that could lead to an extraordinary state of matter known as the Kitaev quantum spin liquid. The realization of this state requires almost perfectly frustrated interactions between the magnetic Ir$^{4+}$ ions, but small imbalances in energy make other ordered states more favorable. Indeed, the closeness in energy of these ordered states is itself a signature of the intrinsic frustration in the system. In this work, we illustrate that small magnetic fields can be employed to drive the frustrated quantum magnet $尾-$Li$_2$IrO$_3$,between different broken symmetry states, but without causing a true thermodynamic phase transition. This field-induced broken symmetry phase has all the signatures of a thermodynamic order parameter, but it is never truly formed in zero field. Rather, it is summoned when the scales of frustration are appropriately tipped, intertwined with other nearby quantum states. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.02531v1-abstract-full').style.display = 'none'; document.getElementById('1703.02531v1-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, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 10 Figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 8, 961 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1607.05359">arXiv:1607.05359</a> <span> [<a href="https://arxiv.org/pdf/1607.05359">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1073/pnas.1612849113">10.1073/pnas.1612849113 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ideal charge density wave order in the high-field state of superconducting YBCO </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jang%2C+H">H. Jang</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+W+-">W. -S. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">H. Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Matsuzawa%2C+S">S. Matsuzawa</a>, <a href="/search/cond-mat?searchtype=author&query=Yasumura%2C+H">H. Yasumura</a>, <a href="/search/cond-mat?searchtype=author&query=Nie%2C+L">L. Nie</a>, <a href="/search/cond-mat?searchtype=author&query=Maharaj%2C+A+V">A. V. Maharaj</a>, <a href="/search/cond-mat?searchtype=author&query=Gerber%2C+S">S. Gerber</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+Y">Y. Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Mehta%2C+A">A. Mehta</a>, <a href="/search/cond-mat?searchtype=author&query=Bonn%2C+D+A">D. A. Bonn</a>, <a href="/search/cond-mat?searchtype=author&query=Liang%2C+R">R. Liang</a>, <a href="/search/cond-mat?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/cond-mat?searchtype=author&query=Burns%2C+C+A">C. A. Burns</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+S">S. Song</a>, <a href="/search/cond-mat?searchtype=author&query=Hastings%2C+J">J. Hastings</a>, <a href="/search/cond-mat?searchtype=author&query=Devereaux%2C+T+P">T. P. Devereaux</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Z+-">Z. -X. Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Kivelson%2C+S+A">S. A. Kivelson</a>, <a href="/search/cond-mat?searchtype=author&query=Kao%2C+C+-">C. -C. Kao</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+D">D. Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+J+-">J. -S. Lee</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="1607.05359v1-abstract-short" style="display: inline;"> The existence of charge density wave (CDW) correlations in cuprate superconductors has now been established. However, the nature of the ground state order has remained uncertain because disorder and the presence of superconductivity typically limit the CDW correlation lengths to a dozen unit cells or less. Here we explore the CDW correlations in YBa2Cu3Ox (YBCO) ortho-II and ortho-VIII crystals, w… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.05359v1-abstract-full').style.display = 'inline'; document.getElementById('1607.05359v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1607.05359v1-abstract-full" style="display: none;"> The existence of charge density wave (CDW) correlations in cuprate superconductors has now been established. However, the nature of the ground state order has remained uncertain because disorder and the presence of superconductivity typically limit the CDW correlation lengths to a dozen unit cells or less. Here we explore the CDW correlations in YBa2Cu3Ox (YBCO) ortho-II and ortho-VIII crystals, which belong to the cleanest available cuprate family, at magnetic fields in excess of the resistive upper critical field (Hc2) where the superconductivity is heavily suppressed. We find an incommensurate, unidirectional CDW with a well-defined onset at a critical field strength that is proportional to Hc2. It is related to but distinct from the short-range bidirectional CDW that exists at zero magnetic field. The unidirectional CDW possesses a long inplane correlation length as well as significant correlations between neighboring CuO2 planes, yielding a correlation volume that is at least 2 - 3 orders of magnitude larger than that of the zero-field CDW. This is by far the largest CDW correlation volume observed in any cuprate crystal and so is presumably representative of the high-field ground-state of an "ideal" disorder-free cuprate. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.05359v1-abstract-full').style.display = 'none'; document.getElementById('1607.05359v1-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 July, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1512.02444">arXiv:1512.02444</a> <span> [<a href="https://arxiv.org/pdf/1512.02444">pdf</a>, <a href="https://arxiv.org/format/1512.02444">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> </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/10.1088/0022-3727/49/9/095001">10.1088/0022-3727/49/9/095001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anomalous coercivity enhancement with temperature and tunable exchange bias in Gd and Ti co-doped BiFeO$_3$ multiferroics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ahmmad%2C+B">Bashir Ahmmad</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+M+Z">M. Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Billah%2C+A">Areef Billah</a>, <a href="/search/cond-mat?searchtype=author&query=Basith%2C+M+A">M. A. Basith</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="1512.02444v1-abstract-short" style="display: inline;"> We have investigated the effect of temperature on magnetic properties of Bi$_{0.9}$Gd$_{0.1}$Fe$_{1-x}$Ti$_x$O$_3$ (x = 0.00-0.20) multiferroic system. Unexpectedly, the coercive fields ($H_{c}$) of this multiferroic system increased with increasing temperature. The coercive fields and remanent magnetization were higher over a wide range of temperatures in sample x = 0.10 i.e. in sample having com… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.02444v1-abstract-full').style.display = 'inline'; document.getElementById('1512.02444v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1512.02444v1-abstract-full" style="display: none;"> We have investigated the effect of temperature on magnetic properties of Bi$_{0.9}$Gd$_{0.1}$Fe$_{1-x}$Ti$_x$O$_3$ (x = 0.00-0.20) multiferroic system. Unexpectedly, the coercive fields ($H_{c}$) of this multiferroic system increased with increasing temperature. The coercive fields and remanent magnetization were higher over a wide range of temperatures in sample x = 0.10 i.e. in sample having composition Bi$_{0.9}$Gd$_{0.1}$Fe$_{0.9}$Ti$_{0.1}$O$_3$ than those of x = 0.00 and 0.20 compositions. Therefore, we have carried out temperature dependent magnetization experiments extensively for sample x = 0.10. The magnetic hysteresis loops at different temperatures exhibit an asymmetric shift towards the magnetic field axes which indicate the presence of exchange bias effect in this material system. The hysteresis loops were also carried out at temperatures 150 K and 250 K by cooling down the sample from 300 K in various cooling magnetic fields ($H_{cool}$). The exchange bias field ($H_{EB}$) values increased with $H_{cool}$ and decreased with temperature. The $H_{EB}$ values were tunable by field cooling at temperatures up to 250 K. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.02444v1-abstract-full').style.display = 'none'; document.getElementById('1512.02444v1-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 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. D: Appl. Phys. 49 (2016) 095001 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1510.07934">arXiv:1510.07934</a> <span> [<a href="https://arxiv.org/pdf/1510.07934">pdf</a>, <a href="https://arxiv.org/format/1510.07934">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.94.024408">10.1103/PhysRevB.94.024408 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> X-ray scattering study of pyrochlore iridates: crystal structure, electronic and magnetic excitations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Clancy%2C+J+P">J. P. Clancy</a>, <a href="/search/cond-mat?searchtype=author&query=Gretarsson%2C+H">H. Gretarsson</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+E+K+H">E. K. H. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Tian%2C+D">Di Tian</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+J">J. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Upton%2C+M+H">M. H. Upton</a>, <a href="/search/cond-mat?searchtype=author&query=Casa%2C+D">D. Casa</a>, <a href="/search/cond-mat?searchtype=author&query=Gog%2C+T">T. Gog</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Jeon%2C+B">Byung-Gu Jeon</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+K+H">Kee Hoon Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Desgreniers%2C+S">S. Desgreniers</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+Y+B">Yong Baek Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Julian%2C+S+J">S. J. Julian</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+Y">Young-June Kim</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="1510.07934v1-abstract-short" style="display: inline;"> We have investigated the structural, electronic, and magnetic properties of the pyrochlore iridates Eu2Ir2O7 and Pr2Ir2O7 using a combination of resonant elastic x-ray scattering, x-ray powder diffraction, and resonant inelastic x-ray scattering (RIXS). The structural parameters of Eu2Ir2O7 have been examined as a function of temperature and applied pressure, with a particular emphasis on regions… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.07934v1-abstract-full').style.display = 'inline'; document.getElementById('1510.07934v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1510.07934v1-abstract-full" style="display: none;"> We have investigated the structural, electronic, and magnetic properties of the pyrochlore iridates Eu2Ir2O7 and Pr2Ir2O7 using a combination of resonant elastic x-ray scattering, x-ray powder diffraction, and resonant inelastic x-ray scattering (RIXS). The structural parameters of Eu2Ir2O7 have been examined as a function of temperature and applied pressure, with a particular emphasis on regions of the phase diagram where electronic and magnetic phase transitions have been reported. We find no evidence of crystal symmetry change over the range of temperatures (~6 to 300 K) and pressures (~0.1 to 17 GPa) studied. We have also investigated the electronic and magnetic excitations in single crystal samples of Eu2Ir2O7 and Pr2Ir2O7 using high resolution Ir L3-edge RIXS. In spite of very different ground state properties, we find these materials exhibit qualitatively similar excitation spectra, with crystal field excitations at ~3-5 eV, spin-orbit excitations at ~0.5-1 eV, and broad low-lying excitations below ~0.15 eV. In Eu2Ir2O7 we observe highly damped magnetic excitations at ~45 meV, which display significant momentum dependence. We compare these results with recent dynamical structure factor calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.07934v1-abstract-full').style.display = 'none'; document.getElementById('1510.07934v1-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 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">14 pages, 13 figures (including supplemental material)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 94, 024408 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1506.07910">arXiv:1506.07910</a> <span> [<a href="https://arxiv.org/pdf/1506.07910">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/science.aac6257">10.1126/science.aac6257 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Three-Dimensional Charge Density Wave Order in YBa2Cu3O6.67 at High Magnetic Fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gerber%2C+S">S. Gerber</a>, <a href="/search/cond-mat?searchtype=author&query=Jang%2C+H">H. Jang</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">H. Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Matsuzawa%2C+S">S. Matsuzawa</a>, <a href="/search/cond-mat?searchtype=author&query=Yasumura%2C+H">H. Yasumura</a>, <a href="/search/cond-mat?searchtype=author&query=Bonn%2C+D+A">D. A. Bonn</a>, <a href="/search/cond-mat?searchtype=author&query=Liang%2C+R">R. Liang</a>, <a href="/search/cond-mat?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Mehta%2C+A">A. Mehta</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+S">S. Song</a>, <a href="/search/cond-mat?searchtype=author&query=Sikorski%2C+M">M. Sikorski</a>, <a href="/search/cond-mat?searchtype=author&query=Stefanescu%2C+D">D. Stefanescu</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+Y">Y. Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Kivelson%2C+S+A">S. A. Kivelson</a>, <a href="/search/cond-mat?searchtype=author&query=Devereaux%2C+T+P">T. P. Devereaux</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Z+-">Z. -X. Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Kao%2C+C+-">C. -C. Kao</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+W+-">W. -S. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+D">D. Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+J+-">J. -S. Lee</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="1506.07910v1-abstract-short" style="display: inline;"> Charge density wave (CDW) correlations have recently been shown to universally exist in cuprate superconductors. However, their nature at high fields inferred from nuclear magnetic resonance is distinct from that measured by x-ray scattering at zero and low fields. Here we combine a pulsed magnet with an x-ray free electron laser to characterize the CDW in YBa2Cu3O6.67 via x-ray scattering in fiel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.07910v1-abstract-full').style.display = 'inline'; document.getElementById('1506.07910v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1506.07910v1-abstract-full" style="display: none;"> Charge density wave (CDW) correlations have recently been shown to universally exist in cuprate superconductors. However, their nature at high fields inferred from nuclear magnetic resonance is distinct from that measured by x-ray scattering at zero and low fields. Here we combine a pulsed magnet with an x-ray free electron laser to characterize the CDW in YBa2Cu3O6.67 via x-ray scattering in fields up to 28 Tesla. While the zero-field CDW order, which develops below T ~ 150 K, is essentially two-dimensional, at lower temperature and beyond 15 Tesla, another three-dimensionally ordered CDW emerges. The field-induced CDW onsets around the zero-field superconducting transition temperature, yet the incommensurate in-plane ordering vector is field-independent. This implies that the two forms of CDW and high-temperature superconductivity are intimately linked. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.07910v1-abstract-full').style.display = 'none'; document.getElementById('1506.07910v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science 350, 949 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1506.00041">arXiv:1506.00041</a> <span> [<a href="https://arxiv.org/pdf/1506.00041">pdf</a>, <a href="https://arxiv.org/format/1506.00041">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/10.1103/PhysRevLett.114.257203">10.1103/PhysRevLett.114.257203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First-order melting of a weak spin-orbit Mott insulator into a correlated metal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hogan%2C+T">Tom Hogan</a>, <a href="/search/cond-mat?searchtype=author&query=Yamani%2C+Z">Z. Yamani</a>, <a href="/search/cond-mat?searchtype=author&query=Walkup%2C+D">D. Walkup</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X">Xiang Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Dally%2C+R">Rebecca Dally</a>, <a href="/search/cond-mat?searchtype=author&query=Ward%2C+T+Z">Thomas Z. Ward</a>, <a href="/search/cond-mat?searchtype=author&query=Hill%2C+J">John Hill</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Madhavan%2C+V">Vidya Madhavan</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+S+D">Stephen D. Wilson</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="1506.00041v1-abstract-short" style="display: inline;"> The electronic phase diagram of the weak spin-orbit Mott insulator (Sr(1-x)Lax)3Ir2O7 is determined via an exhaustive experimental study. Upon doping electrons via La substitution, an immediate collapse in resistivity occurs along with a narrow regime of nanoscale phase separation comprised of antiferromagnetic, insulating regions and paramagnetic, metallic puddles persisting until x~0.04. Continu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.00041v1-abstract-full').style.display = 'inline'; document.getElementById('1506.00041v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1506.00041v1-abstract-full" style="display: none;"> The electronic phase diagram of the weak spin-orbit Mott insulator (Sr(1-x)Lax)3Ir2O7 is determined via an exhaustive experimental study. Upon doping electrons via La substitution, an immediate collapse in resistivity occurs along with a narrow regime of nanoscale phase separation comprised of antiferromagnetic, insulating regions and paramagnetic, metallic puddles persisting until x~0.04. Continued electron doping results in an abrupt, first-order phase boundary where the Neel state is suppressed and a homogenous, correlated, metallic state appears with an enhanced spin susceptibility and local moments. As the metallic state is stabilized, a weak structural distortion develops and suggests a competing instability with the parent spin-orbit Mott state. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.00041v1-abstract-full').style.display = 'none'; document.getElementById('1506.00041v1-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 May, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">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 Letters 114, 257203 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1404.3193">arXiv:1404.3193</a> <span> [<a href="https://arxiv.org/pdf/1404.3193">pdf</a>, <a href="https://arxiv.org/ps/1404.3193">ps</a>, <a href="https://arxiv.org/format/1404.3193">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.90.100510">10.1103/PhysRevB.90.100510 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Rotated stripe order and its competition with superconductivity in La$_{1.88}$Sr$_{0.12}$CuO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Thampy%2C+V">V. Thampy</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+M+P+M">M. P. M. Dean</a>, <a href="/search/cond-mat?searchtype=author&query=Christensen%2C+N+B">N. B. Christensen</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Oda%2C+M">M. Oda</a>, <a href="/search/cond-mat?searchtype=author&query=Ido%2C+M">M. Ido</a>, <a href="/search/cond-mat?searchtype=author&query=Momono%2C+N">N. Momono</a>, <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S+B">S. B. Wilkins</a>, <a href="/search/cond-mat?searchtype=author&query=Hil%2C+J+P">J. P. Hil</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="1404.3193v2-abstract-short" style="display: inline;"> We report the observation of a bulk charge modulation in La$_{1.88}$Sr$_{0.12}$CuO$_4$ (LSCO) with a characteristic in-plane wave-vector of (0.236, $\pm 未$), with $未$=0.011 r.l.u. The transverse shift of the ordering wave-vector indicates the presence of rotated charge-stripe ordering, demonstrating that the charge ordering is not pinned to the Cu-O bond direction. On cooling through the supercond… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.3193v2-abstract-full').style.display = 'inline'; document.getElementById('1404.3193v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1404.3193v2-abstract-full" style="display: none;"> We report the observation of a bulk charge modulation in La$_{1.88}$Sr$_{0.12}$CuO$_4$ (LSCO) with a characteristic in-plane wave-vector of (0.236, $\pm 未$), with $未$=0.011 r.l.u. The transverse shift of the ordering wave-vector indicates the presence of rotated charge-stripe ordering, demonstrating that the charge ordering is not pinned to the Cu-O bond direction. On cooling through the superconducting transition, we find an abrupt change in the growth of the charge correlations and a suppression of the charge order parameter indicating competition between the two orderings. Orthorhombic LSCO thus helps bridge the apparent disparities between the behavior previously observed in the tetragonal "214" cuprates and the orthorhombic yttrium and bismuth-based cuprates and thus lends strong support to the idea that there is a common motif to charge order in all cuprate families. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.3193v2-abstract-full').style.display = 'none'; document.getElementById('1404.3193v2-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 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 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">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figues</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, 100510 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1402.3254">arXiv:1402.3254</a> <span> [<a href="https://arxiv.org/pdf/1402.3254">pdf</a>, <a href="https://arxiv.org/format/1402.3254">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> </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/ncomms5203">10.1038/ncomms5203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A new spin-anisotropic harmonic honeycomb iridate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Modic%2C+K+A">Kimberly A. Modic</a>, <a href="/search/cond-mat?searchtype=author&query=Smidt%2C+T+E">Tess E. Smidt</a>, <a href="/search/cond-mat?searchtype=author&query=Kimchi%2C+I">Itamar Kimchi</a>, <a href="/search/cond-mat?searchtype=author&query=Breznay%2C+N+P">Nicholas P. Breznay</a>, <a href="/search/cond-mat?searchtype=author&query=Biffin%2C+A">Alun Biffin</a>, <a href="/search/cond-mat?searchtype=author&query=Choi%2C+S">Sungkyun Choi</a>, <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+R+D">Roger D. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=Coldea%2C+R">Radu Coldea</a>, <a href="/search/cond-mat?searchtype=author&query=Watkins-Curry%2C+P">Pilanda Watkins-Curry</a>, <a href="/search/cond-mat?searchtype=author&query=McCandless%2C+G+T">Gregory T. McCandless</a>, <a href="/search/cond-mat?searchtype=author&query=Gandara%2C+F">Felipe Gandara</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Vishwanath%2C+A">Ashvin Vishwanath</a>, <a href="/search/cond-mat?searchtype=author&query=Chan%2C+J+Y">Julia Y. Chan</a>, <a href="/search/cond-mat?searchtype=author&query=Shekhter%2C+A">Arkady Shekhter</a>, <a href="/search/cond-mat?searchtype=author&query=McDonald%2C+R+D">Ross D. McDonald</a>, <a href="/search/cond-mat?searchtype=author&query=Analytis%2C+J+G">James G. Analytis</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="1402.3254v2-abstract-short" style="display: inline;"> The physics of Mott insulators underlies diverse phenomena ranging from high temperature superconductivity to exotic magnetism. Although both the electron spin and the structure of the local orbitals play a key role in this physics, in most systems these are connected only indirectly --- via the Pauli exclusion principle and the Coulomb interaction. Iridium-based oxides (iridates) open a further d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1402.3254v2-abstract-full').style.display = 'inline'; document.getElementById('1402.3254v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1402.3254v2-abstract-full" style="display: none;"> The physics of Mott insulators underlies diverse phenomena ranging from high temperature superconductivity to exotic magnetism. Although both the electron spin and the structure of the local orbitals play a key role in this physics, in most systems these are connected only indirectly --- via the Pauli exclusion principle and the Coulomb interaction. Iridium-based oxides (iridates) open a further dimension to this problem by introducing strong spin-orbit interactions, such that the Mott physics has a strong orbital character. In the layered honeycomb iridates this is thought to generate highly spin-anisotropic interactions, coupling the spin orientation to a given spatial direction of exchange and leading to strongly frustrated magnetism. The potential for new physics emerging from such interactions has driven much scientific excitement, most recently in the search for a new quantum spin liquid, first discussed by Kitaev \cite{kitaev_anyons_2006}. Here we report a new iridate structure that has the same local connectivity as the layered honeycomb, but in a three-dimensional framework. The temperature dependence of the magnetic susceptibility exhibits a striking reordering of the magnetic anisotropy, giving evidence for highly spin-anisotropic exchange interactions. Furthermore, the basic structural units of this material suggest the possibility of a new family of structures, the `harmonic honeycomb' iridates. This compound thus provides a unique and exciting glimpse into the physics of a new class of strongly spin-orbit coupled Mott insulators. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1402.3254v2-abstract-full').style.display = 'none'; document.getElementById('1402.3254v2-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, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 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">12 pages including bibliography, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 5, 4203 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1312.4005">arXiv:1312.4005</a> <span> [<a href="https://arxiv.org/pdf/1312.4005">pdf</a>, <a href="https://arxiv.org/format/1312.4005">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.112.147201">10.1103/PhysRevLett.112.147201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Tuning Magnetic Coupling in Sr$_2$IrO$_4$ Thin Films with Epitaxial Strain </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lupascu%2C+A">A. Lupascu</a>, <a href="/search/cond-mat?searchtype=author&query=Clancy%2C+J+P">J. P. Clancy</a>, <a href="/search/cond-mat?searchtype=author&query=Gretarsson%2C+H">H. Gretarsson</a>, <a href="/search/cond-mat?searchtype=author&query=Nie%2C+Z">Zixin Nie</a>, <a href="/search/cond-mat?searchtype=author&query=Nichols%2C+J">J. Nichols</a>, <a href="/search/cond-mat?searchtype=author&query=Terzic%2C+J">J. Terzic</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+G">G. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Seo%2C+S+S+A">S. S. A. Seo</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Upton%2C+M+H">M. H. Upton</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+J">Jungho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Said%2C+A+H">A. H. Said</a>, <a href="/search/cond-mat?searchtype=author&query=Casa%2C+D">D. Casa</a>, <a href="/search/cond-mat?searchtype=author&query=Gog%2C+T">T. Gog</a>, <a href="/search/cond-mat?searchtype=author&query=Katukuri%2C+V+M">Vamshi M. Katukuri</a>, <a href="/search/cond-mat?searchtype=author&query=Stoll%2C+H">H. Stoll</a>, <a href="/search/cond-mat?searchtype=author&query=Hozoi%2C+L">L. Hozoi</a>, <a href="/search/cond-mat?searchtype=author&query=Brink%2C+J+v+d">J. van den Brink</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+Y">Young-June Kim</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="1312.4005v2-abstract-short" style="display: inline;"> We report x-ray resonant magnetic scattering (XRMS) and resonant inelastic x-ray scattering (RIXS) studies of epitaxially-strained $\mathrm{Sr_2IrO_4}$ thin films. The films were grown on $\mathrm{SrTiO_3}$ and $\mathrm{(LaAlO_3)_{0.3}(Sr_2AlTaO_6)_{0.7}}$ substrates, under slight tensile and compressive strains, respectively. Although the films develop a magnetic structure reminiscent of bulk… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.4005v2-abstract-full').style.display = 'inline'; document.getElementById('1312.4005v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1312.4005v2-abstract-full" style="display: none;"> We report x-ray resonant magnetic scattering (XRMS) and resonant inelastic x-ray scattering (RIXS) studies of epitaxially-strained $\mathrm{Sr_2IrO_4}$ thin films. The films were grown on $\mathrm{SrTiO_3}$ and $\mathrm{(LaAlO_3)_{0.3}(Sr_2AlTaO_6)_{0.7}}$ substrates, under slight tensile and compressive strains, respectively. Although the films develop a magnetic structure reminiscent of bulk $\mathrm{Sr_2IrO_4}$, the magnetic correlations are extremely anisotropic, with in-plane correlation lengths significantly longer than the out-of-plane correlation lengths. In addition, the compressive (tensile) strain serves to suppress (enhance) the magnetic ordering temperature $\mathrm{T_N}$, while raising (lowering) the energy of the zone boundary magnon. Quantum chemical calculations show that the tuning of magnetic energy scales can be understood in terms of strain-induced change in bond lengths. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.4005v2-abstract-full').style.display = 'none'; document.getElementById('1312.4005v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 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">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. Lett. 112, 147201 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1311.0039">arXiv:1311.0039</a> <span> [<a href="https://arxiv.org/pdf/1311.0039">pdf</a>, <a href="https://arxiv.org/ps/1311.0039">ps</a>, <a href="https://arxiv.org/format/1311.0039">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.89.054409">10.1103/PhysRevB.89.054409 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dilute Magnetism and Spin-Orbital Percolation Effects in Rh-doped Sr2IrO4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Clancy%2C+J+P">J. P. Clancy</a>, <a href="/search/cond-mat?searchtype=author&query=Lupascu%2C+A">A. Lupascu</a>, <a href="/search/cond-mat?searchtype=author&query=Gretarsson%2C+H">H. Gretarsson</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+Y+F">Y. F. Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Casa%2C+D">D. Casa</a>, <a href="/search/cond-mat?searchtype=author&query=Nelson%2C+C+S">C. S. Nelson</a>, <a href="/search/cond-mat?searchtype=author&query=Lamarra%2C+S+C">S. C. Lamarra</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+G">G. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+Y">Young-June Kim</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="1311.0039v2-abstract-short" style="display: inline;"> We have used a combination of resonant magnetic x-ray scattering (RMXS) and x-ray absorption spectroscopy (XAS) to investigate the properties of the doped spin-orbital Mott insulator Sr2Ir(1-x)Rh(x)O4 (0.07 < x < 0.70). We show that Sr2Ir(1-x)Rh(x)O4 represents a unique model system for the study of dilute magnetism in the presence of strong spin-orbit coupling, and provide evidence of a doping-in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.0039v2-abstract-full').style.display = 'inline'; document.getElementById('1311.0039v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1311.0039v2-abstract-full" style="display: none;"> We have used a combination of resonant magnetic x-ray scattering (RMXS) and x-ray absorption spectroscopy (XAS) to investigate the properties of the doped spin-orbital Mott insulator Sr2Ir(1-x)Rh(x)O4 (0.07 < x < 0.70). We show that Sr2Ir(1-x)Rh(x)O4 represents a unique model system for the study of dilute magnetism in the presence of strong spin-orbit coupling, and provide evidence of a doping-induced change in magnetic structure and a suppression of magnetic order at x_c ~ 0.17. We demonstrate that Rh-doping introduces Rh3+/Ir5+ ions which effectively hole-dope this material. We propose that the magnetic phase diagram for this material can be understood in terms of a novel spin-orbital percolation picture. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.0039v2-abstract-full').style.display = 'none'; document.getElementById('1311.0039v2-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 February, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 October, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">9 pages, 7 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 89, 054409 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1207.0960">arXiv:1207.0960</a> <span> [<a href="https://arxiv.org/pdf/1207.0960">pdf</a>, <a href="https://arxiv.org/ps/1207.0960">ps</a>, <a href="https://arxiv.org/format/1207.0960">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"> Field-induced magnetic behavior of the bilayer iridate Sr3Ir2O7 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Clancy%2C+J+P">J. P. Clancy</a>, <a href="/search/cond-mat?searchtype=author&query=Plumb%2C+K+W">K. W. Plumb</a>, <a href="/search/cond-mat?searchtype=author&query=Nelson%2C+C+S">C. S. Nelson</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+G">G. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Qi%2C+T">T. Qi</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+Y">Young-June Kim</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="1207.0960v1-abstract-short" style="display: inline;"> We have performed resonant magnetic x-ray scattering (RMXS) measurements on single crystal samples of the bilayer iridate Sr3Ir2O7. We observe the development of antiferromagnetic order below T* ~ 260 K, which persists down to T = 4 K under both field-cooled (fc) and zero-field-cooled (zfc) conditions. The temperature dependence of the fc and zfc magnetic Bragg peaks suggests the presence of compe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.0960v1-abstract-full').style.display = 'inline'; document.getElementById('1207.0960v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1207.0960v1-abstract-full" style="display: none;"> We have performed resonant magnetic x-ray scattering (RMXS) measurements on single crystal samples of the bilayer iridate Sr3Ir2O7. We observe the development of antiferromagnetic order below T* ~ 260 K, which persists down to T = 4 K under both field-cooled (fc) and zero-field-cooled (zfc) conditions. The temperature dependence of the fc and zfc magnetic Bragg peaks suggests the presence of competition between canted and collinear antiferromagnetic ground states. Under zfc conditions, we observe a suppression of magnetic peak intensity at T_D ~ 50 K which can be attributed to a spin reorientation transition. Under fc conditions, we find that the canted antiferromagnetic state is stabilized over a much wider range of temperatures, with significantly enhanced magnetic correlation lengths within the Ir-O layers. The field dependence of the magnetic Bragg peaks provides no evidence of field-induced phase transitions for H < 4 T. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.0960v1-abstract-full').style.display = 'none'; document.getElementById('1207.0960v1-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 July, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">11 pages, 5 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/1204.5693">arXiv:1204.5693</a> <span> [<a href="https://arxiv.org/pdf/1204.5693">pdf</a>, <a href="https://arxiv.org/ps/1204.5693">ps</a>, <a href="https://arxiv.org/format/1204.5693">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/PhysRevLett.109.027004">10.1103/PhysRevLett.109.027004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Susceptibility anisotropy in an iron arsenide superconductor revealed by x-ray diffraction in pulsed magnetic fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">J. P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Chu%2C+J+-">J. -H. Chu</a>, <a href="/search/cond-mat?searchtype=author&query=Kuo%2C+H+-">H. -H. Kuo</a>, <a href="/search/cond-mat?searchtype=author&query=Das%2C+R+K">R. K. Das</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">H. Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Fisher%2C+I+R">I. R. Fisher</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</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="1204.5693v1-abstract-short" style="display: inline;"> In addition to unconventional high-Tc superconductivity, the iron arsenides exhibit strong magnetoelastic coupling and a notable electronic anisotropy within the a-b plane. We relate these properties by studying underdoped Ba(Fe{1-x}Co{x})2As2 by x-ray diffraction in pulsed magnetic fields up to 27.5 Tesla. We exploit magnetic detwinning effects to demonstrate anisotropy in the in-plane susceptibi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1204.5693v1-abstract-full').style.display = 'inline'; document.getElementById('1204.5693v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1204.5693v1-abstract-full" style="display: none;"> In addition to unconventional high-Tc superconductivity, the iron arsenides exhibit strong magnetoelastic coupling and a notable electronic anisotropy within the a-b plane. We relate these properties by studying underdoped Ba(Fe{1-x}Co{x})2As2 by x-ray diffraction in pulsed magnetic fields up to 27.5 Tesla. We exploit magnetic detwinning effects to demonstrate anisotropy in the in-plane susceptibility, which develops at the structural phase transition despite the absence of magnetic order. The degree of detwinning increases smoothly with decreasing temperature, and a single- domain condition is realized over a range of field and temperature. At low temperatures we observe an activated behavior, with a large hysteretic remnant effect. Detwinning was not observed within the superconducting phase for accessible magnetic fields. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1204.5693v1-abstract-full').style.display = 'none'; document.getElementById('1204.5693v1-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 April, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">5 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. Lett. 109, 027004 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1112.0978">arXiv:1112.0978</a> <span> [<a href="https://arxiv.org/pdf/1112.0978">pdf</a>, <a href="https://arxiv.org/ps/1112.0978">ps</a>, <a href="https://arxiv.org/format/1112.0978">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.108.187601">10.1103/PhysRevLett.108.187601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charge order in LuFe2O4: an unlikely route to ferroelectricity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=de+Groot%2C+J">J. de Groot</a>, <a href="/search/cond-mat?searchtype=author&query=Mueller%2C+T">T. Mueller</a>, <a href="/search/cond-mat?searchtype=author&query=Rosenberg%2C+R+A">R. A. Rosenberg</a>, <a href="/search/cond-mat?searchtype=author&query=Keavney%2C+D+J">D. J. Keavney</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+J+-">J. -W. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Angst%2C+M">M. Angst</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="1112.0978v2-abstract-short" style="display: inline;"> We present the refinement of the crystal structure of charge-ordered LuFe2O4, based on single-crystal x-ray diffraction data. The arrangement of the different Fe-valence states, determined with bond-valence-sum analysis, corresponds to a stacking of charged Fe bilayers, in contrast to the polar bilayers previously suggested. This arrangement is supported by an analysis of x-ray magnetic circular d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1112.0978v2-abstract-full').style.display = 'inline'; document.getElementById('1112.0978v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1112.0978v2-abstract-full" style="display: none;"> We present the refinement of the crystal structure of charge-ordered LuFe2O4, based on single-crystal x-ray diffraction data. The arrangement of the different Fe-valence states, determined with bond-valence-sum analysis, corresponds to a stacking of charged Fe bilayers, in contrast to the polar bilayers previously suggested. This arrangement is supported by an analysis of x-ray magnetic circular dichroism spectra, which also evidences a strong charge-spin coupling. The non-polar bilayers are inconsistent with charge order based ferroelectricity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1112.0978v2-abstract-full').style.display = 'none'; document.getElementById('1112.0978v2-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 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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, 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. Lett. 108, 187601 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1109.6713">arXiv:1109.6713</a> <span> [<a href="https://arxiv.org/pdf/1109.6713">pdf</a>, <a href="https://arxiv.org/format/1109.6713">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/10.1063/1.3688251">10.1063/1.3688251 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A single-solenoid pulsed-magnet system for single-crystal scattering studies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Capatina%2C+D">Dana Capatina</a>, <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">Jacob P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Das%2C+R+K">Ritesh K. Das</a>, <a href="/search/cond-mat?searchtype=author&query=Trakhtenberg%2C+E">Emil Trakhtenberg</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">Hiroyuki Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Narumi%2C+Y">Yasuo Narumi</a>, <a href="/search/cond-mat?searchtype=author&query=Welp%2C+U">Ulrich Welp</a>, <a href="/search/cond-mat?searchtype=author&query=Canfield%2C+P+C">Paul C. Canfield</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="1109.6713v2-abstract-short" style="display: inline;"> We present a pulsed-magnet system that enables x-ray single-crystal diffraction in addition to powder and spectroscopic studies with the magnetic field applied on or close to the scattering plane. The apparatus consists of a single large-bore solenoid, cooled by liquid nitrogen. A second independent closed-cycle cryostat is used for cooling samples near liquid helium temperatures. Pulsed magnetic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1109.6713v2-abstract-full').style.display = 'inline'; document.getElementById('1109.6713v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1109.6713v2-abstract-full" style="display: none;"> We present a pulsed-magnet system that enables x-ray single-crystal diffraction in addition to powder and spectroscopic studies with the magnetic field applied on or close to the scattering plane. The apparatus consists of a single large-bore solenoid, cooled by liquid nitrogen. A second independent closed-cycle cryostat is used for cooling samples near liquid helium temperatures. Pulsed magnetic fields close to $\sim 30$ T with a zero-to-peak-field rise time of $\sim$2.9 ms are generated by discharging a 40 kJ capacitor bank into the magnet coil. The unique characteristic of this instrument is the preservation of maximum scattering angle ($\sim 23.6^\circ$) on the entrance and exit sides of the magnet bore by virtue of a novel double-funnel insert. This instrument will facilitate x-ray diffraction and spectroscopic studies that are impractical, if not impossible, to perform using split-pair and narrow-opening solenoid magnets, and offers a practical solution for preserving optical access in future higher-field pulsed magnets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1109.6713v2-abstract-full').style.display = 'none'; document.getElementById('1109.6713v2-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 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 September, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">Accepted for publication in Rev. Sci. Instrum</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1109.6711">arXiv:1109.6711</a> <span> [<a href="https://arxiv.org/pdf/1109.6711">pdf</a>, <a href="https://arxiv.org/format/1109.6711">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="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/10.1063/1.3675478">10.1063/1.3675478 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Time-resolved one-dimensional detection of x-ray scattering in pulsed magnetic fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">Jacob P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Ross%2C+K+A">Kate A. Ross</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">Hiroyuki Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Gaulin%2C+B+D">Bruce D. Gaulin</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="1109.6711v1-abstract-short" style="display: inline;"> We have developed an application of a one-dimensional micro-strip detector for capturing x-ray diffraction data in pulsed magnetic fields. This detector consists of a large array of 50 渭m-wide Si strips with a full-frame read out at 20 kHz. Its use substantially improves data-collection efficiency and quality as compared to point detectors, because diffraction signals are recorded along an arc in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1109.6711v1-abstract-full').style.display = 'inline'; document.getElementById('1109.6711v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1109.6711v1-abstract-full" style="display: none;"> We have developed an application of a one-dimensional micro-strip detector for capturing x-ray diffraction data in pulsed magnetic fields. This detector consists of a large array of 50 渭m-wide Si strips with a full-frame read out at 20 kHz. Its use substantially improves data-collection efficiency and quality as compared to point detectors, because diffraction signals are recorded along an arc in reciprocal space in a time-resolved manner. By synchronizing with pulsed fields, the entire field dependence of a two-dimensional swath of reciprocal space may be determined using a small number of field pulses. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1109.6711v1-abstract-full').style.display = 'none'; document.getElementById('1109.6711v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 September, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">Submitted to Rev. Sci. Instrum</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1109.5986">arXiv:1109.5986</a> <span> [<a href="https://arxiv.org/pdf/1109.5986">pdf</a>, <a href="https://arxiv.org/ps/1109.5986">ps</a>, <a href="https://arxiv.org/format/1109.5986">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.85.024104">10.1103/PhysRevB.85.024104 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A robust but disordered collapsed-volume phase in a cerium alloy under the application of pulsed magnetic fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">J. P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Das%2C+R+K">R. K. Das</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">H. Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Cooley%2C+J+C">J. C. Cooley</a>, <a href="/search/cond-mat?searchtype=author&query=Mielke%2C+C+H">C. H. Mielke</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="1109.5986v1-abstract-short" style="display: inline;"> We report synchrotron x-ray powder diffraction measurements of Ce0.8La0.1Th0.1 subject to pulsed magnetic fields as high as 28 Tesla. This alloy is known to exhibit a continuous volume collapse on cooling at ambient pressure, which is a modification of the gamma -> alpha transition in elemental cerium. Recently, it has been suggested on the basis of field-cooled resistivity and pulsed field magnet… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1109.5986v1-abstract-full').style.display = 'inline'; document.getElementById('1109.5986v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1109.5986v1-abstract-full" style="display: none;"> We report synchrotron x-ray powder diffraction measurements of Ce0.8La0.1Th0.1 subject to pulsed magnetic fields as high as 28 Tesla. This alloy is known to exhibit a continuous volume collapse on cooling at ambient pressure, which is a modification of the gamma -> alpha transition in elemental cerium. Recently, it has been suggested on the basis of field-cooled resistivity and pulsed field magnetization measurements that the volume collapse in this alloy can be suppressed by the application of magnetic fields. Conversely, our direct diffraction measurements show a robust collapsed phase, which persists in magnetic fields as high as 28 Tesla. We also observe nanoscale disorder in the collapsed phase, which increasingly contaminates the high temperature phase on thermal cycling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1109.5986v1-abstract-full').style.display = 'none'; document.getElementById('1109.5986v1-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 September, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">6 pages, 6 figures, submitted to PRB</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 85, 024104 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1008.2967">arXiv:1008.2967</a> <span> [<a href="https://arxiv.org/pdf/1008.2967">pdf</a>, <a href="https://arxiv.org/ps/1008.2967">ps</a>, <a href="https://arxiv.org/format/1008.2967">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.82.144525">10.1103/PhysRevB.82.144525 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Heat capacity study of BaFe$_{2}$As$_{2}$: effects of annealing </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Rotundu%2C+C+R">C. R. Rotundu</a>, <a href="/search/cond-mat?searchtype=author&query=Freelon%2C+B">B. Freelon</a>, <a href="/search/cond-mat?searchtype=author&query=Forrest%2C+T+R">T. R. Forrest</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+S+D">S. D. Wilson</a>, <a href="/search/cond-mat?searchtype=author&query=Valdivia%2C+P+N">P. N. Valdivia</a>, <a href="/search/cond-mat?searchtype=author&query=Pinuellas%2C+G">G. Pinuellas</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+A">A. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+J+-">J. -W. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Bourret-Courchesne%2C+E">E. Bourret-Courchesne</a>, <a href="/search/cond-mat?searchtype=author&query=Phillips%2C+N+E">N. E. Phillips</a>, <a href="/search/cond-mat?searchtype=author&query=Birgeneau%2C+R+J">R. J. Birgeneau</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1008.2967v2-abstract-short" style="display: inline;"> Heat-capacity, X-ray diffraction, and resistivity measurements on a high-quality BaFe$_{2}$As$_{2}$ sample show an evolution of the magneto-structural transition with successive annealing periods. After a 30-day anneal the resistivity in the (ab) plane decreases by more than an order of magnitude, to 12 $渭惟$cm, with a residual resistance ratio $\sim$36; the heat-capacity anomaly at the transition… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1008.2967v2-abstract-full').style.display = 'inline'; document.getElementById('1008.2967v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1008.2967v2-abstract-full" style="display: none;"> Heat-capacity, X-ray diffraction, and resistivity measurements on a high-quality BaFe$_{2}$As$_{2}$ sample show an evolution of the magneto-structural transition with successive annealing periods. After a 30-day anneal the resistivity in the (ab) plane decreases by more than an order of magnitude, to 12 $渭惟$cm, with a residual resistance ratio $\sim$36; the heat-capacity anomaly at the transition sharpens, to an overall width of less than K, and shifts from 135.4 to 140.2 K. The heat-capacity anomaly in both the as-grown sample and after the 30-day anneal shows a hysteresis of $\sim$0.15 K, and is unchanged in a magnetic field $渭_{0}$H = 14 T. The X-ray and heat-capacity data combined suggest that there is a first order jump in the structural order parameter. The entropy of the transition is reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1008.2967v2-abstract-full').style.display = 'none'; document.getElementById('1008.2967v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 October, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 August, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 82, 144525, 2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1006.2854">arXiv:1006.2854</a> <span> [<a href="https://arxiv.org/pdf/1006.2854">pdf</a>, <a href="https://arxiv.org/format/1006.2854">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.105.077203">10.1103/PhysRevLett.105.077203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetoelastics of a spin liquid: X-ray diffraction studies of Tb2Ti2O7 in pulsed magnetic fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ruff%2C+J+P+C">J. P. C. Ruff</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Clancy%2C+J+P">J. P. Clancy</a>, <a href="/search/cond-mat?searchtype=author&query=Ross%2C+K+A">K. A. Ross</a>, <a href="/search/cond-mat?searchtype=author&query=Nojiri%2C+H">H. Nojiri</a>, <a href="/search/cond-mat?searchtype=author&query=Matsuda%2C+Y+H">Y. H. Matsuda</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=Dabkowski%2C+A+D">A. D. Dabkowski</a>, <a href="/search/cond-mat?searchtype=author&query=Gaulin%2C+B+D">B. D. Gaulin</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="1006.2854v1-abstract-short" style="display: inline;"> We report high resolution single crystal x-ray diffraction measurements of the frustrated pyrochlore magnet Tb2Ti2O7, collected using a novel low temperature pulsed magnet system. This instrument allows characterization of structural degrees of freedom to temperatures as low as 4.4 K, and in applied magnetic fields as large as 30 Tesla. We show that Tb2Ti2O7 manifests intriguing structural effects… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1006.2854v1-abstract-full').style.display = 'inline'; document.getElementById('1006.2854v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1006.2854v1-abstract-full" style="display: none;"> We report high resolution single crystal x-ray diffraction measurements of the frustrated pyrochlore magnet Tb2Ti2O7, collected using a novel low temperature pulsed magnet system. This instrument allows characterization of structural degrees of freedom to temperatures as low as 4.4 K, and in applied magnetic fields as large as 30 Tesla. We show that Tb2Ti2O7 manifests intriguing structural effects under the application of magnetic fields, including strongly anisotropic giant magnetostriction, a restoration of perfect pyrochlore symmetry in low magnetic fields, and ultimately a structural phase transition in high magnetic fields. It is suggested that the magnetoelastic coupling thus revealed plays a significant role in the spin liquid physics of Tb2Ti2O7 at low temperatures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1006.2854v1-abstract-full').style.display = 'none'; document.getElementById('1006.2854v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 June, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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, submitted for publication</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 105, 077203 (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1002.3364">arXiv:1002.3364</a> <span> [<a href="https://arxiv.org/pdf/1002.3364">pdf</a>, <a href="https://arxiv.org/ps/1002.3364">ps</a>, <a href="https://arxiv.org/format/1002.3364">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/10.1126/science.1190482">10.1126/science.1190482 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chu%2C+J">Jiun-Haw Chu</a>, <a href="/search/cond-mat?searchtype=author&query=Analytis%2C+J+G">James G. Analytis</a>, <a href="/search/cond-mat?searchtype=author&query=De+Greve%2C+K">Kristiaan De Greve</a>, <a href="/search/cond-mat?searchtype=author&query=McMahon%2C+P+L">Peter L. McMahon</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Yamamoto%2C+Y">Yoshihisa Yamamoto</a>, <a href="/search/cond-mat?searchtype=author&query=Fisher%2C+I+R">Ian R. Fisher</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="1002.3364v2-abstract-short" style="display: inline;"> Electrical resistivity measurements of detwinned single crystals of the representative iron arsenide Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ reveal a dramatic in-plane anisotropy associated with the tetragonal-to-orthorhombic structural transition that precedes the onset of long-range antiferromagnetic order. These results indicate that the structural transition in this family of compounds is fundamental… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.3364v2-abstract-full').style.display = 'inline'; document.getElementById('1002.3364v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1002.3364v2-abstract-full" style="display: none;"> Electrical resistivity measurements of detwinned single crystals of the representative iron arsenide Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ reveal a dramatic in-plane anisotropy associated with the tetragonal-to-orthorhombic structural transition that precedes the onset of long-range antiferromagnetic order. These results indicate that the structural transition in this family of compounds is fundamentally electronic in origin. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.3364v2-abstract-full').style.display = 'none'; document.getElementById('1002.3364v2-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 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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> Science 329, 824 (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0809.4483">arXiv:0809.4483</a> <span> [<a href="https://arxiv.org/pdf/0809.4483">pdf</a>, <a href="https://arxiv.org/ps/0809.4483">ps</a>, <a href="https://arxiv.org/format/0809.4483">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.101.227602">10.1103/PhysRevLett.101.227602 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charge order, dynamics, and magneto-structural transition in multiferroic LuFe$_2$O$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Xu%2C+X+S">X. S. Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Angst%2C+M">M. Angst</a>, <a href="/search/cond-mat?searchtype=author&query=Brinzari%2C+T+V">T. V. Brinzari</a>, <a href="/search/cond-mat?searchtype=author&query=Hermann%2C+R+P">R. P. Hermann</a>, <a href="/search/cond-mat?searchtype=author&query=Musfeldt%2C+J+L">J. L. Musfeldt</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=Mandrus%2C+D">D. Mandrus</a>, <a href="/search/cond-mat?searchtype=author&query=Sales%2C+B+C">B. C. Sales</a>, <a href="/search/cond-mat?searchtype=author&query=McGill%2C+S">S. McGill</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+J+-">J. -W. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</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="0809.4483v2-abstract-short" style="display: inline;"> We investigated the series of temperature and field-driven transitions in LuFe$_2$O$_4$ by optical and M枚ssbauer spectroscopies, magnetization, and x-ray scattering in order to understand the interplay between charge, structure, and magnetism in this multiferroic material. We demonstrate that charge fluctuation has an onset well below the charge ordering transition, supporting the "order by fluc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.4483v2-abstract-full').style.display = 'inline'; document.getElementById('0809.4483v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0809.4483v2-abstract-full" style="display: none;"> We investigated the series of temperature and field-driven transitions in LuFe$_2$O$_4$ by optical and M枚ssbauer spectroscopies, magnetization, and x-ray scattering in order to understand the interplay between charge, structure, and magnetism in this multiferroic material. We demonstrate that charge fluctuation has an onset well below the charge ordering transition, supporting the "order by fluctuation" mechanism for the development of charge order superstructure. Bragg splitting and large magneto optical contrast suggest a low temperature monoclinic distortion that can be driven by both temperature and magnetic field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.4483v2-abstract-full').style.display = 'none'; document.getElementById('0809.4483v2-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, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 September, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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, 3 figures, PRL in print</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 101, 227602 (2008) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0805.4193">arXiv:0805.4193</a> <span> [<a href="https://arxiv.org/pdf/0805.4193">pdf</a>, <a href="https://arxiv.org/format/0805.4193">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.78.134526">10.1103/PhysRevB.78.134526 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Fermi-surface induced modulation in an optimally doped YBCO superconductor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Liu%2C+X">Xuerong Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Zahirul Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Sinha%2C+S+K">Sunil K. Sinha</a>, <a href="/search/cond-mat?searchtype=author&query=Moss%2C+S+C">Simon C. Moss</a>, <a href="/search/cond-mat?searchtype=author&query=McQueeney%2C+R+J">Robert J. McQueeney</a>, <a href="/search/cond-mat?searchtype=author&query=Lang%2C+J+C">Jonathan C. Lang</a>, <a href="/search/cond-mat?searchtype=author&query=Welp%2C+U">Ulrich Welp</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="0805.4193v1-abstract-short" style="display: inline;"> We have observed a Fermi-surface (FS) induced lattice modulation in a YBCO superconductor with a wavevector along CuO chains, {\it i.e.} ${\bf q}_1$=(0,$未$,0). The value of $未\sim0.21$ is twice the Fermi wavevector ($2{\bf k}_F$) along {\bf b*} connecting nearly nested FS `ridges'. The ${\bf q}_1$ modulation exists only within O-vacancy-ordered islands (characterized by ${\bf q}_0$=… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.4193v1-abstract-full').style.display = 'inline'; document.getElementById('0805.4193v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0805.4193v1-abstract-full" style="display: none;"> We have observed a Fermi-surface (FS) induced lattice modulation in a YBCO superconductor with a wavevector along CuO chains, {\it i.e.} ${\bf q}_1$=(0,$未$,0). The value of $未\sim0.21$ is twice the Fermi wavevector ($2{\bf k}_F$) along {\bf b*} connecting nearly nested FS `ridges'. The ${\bf q}_1$ modulation exists only within O-vacancy-ordered islands (characterized by ${\bf q}_0$=$(\frac14,0,0))$ and persists well above and below $T_c$. Our results are consistent with the presence of a FS-induced charge-density wave. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.4193v1-abstract-full').style.display = 'none'; document.getElementById('0805.4193v1-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 May, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2008. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0802.4273">arXiv:0802.4273</a> <span> [<a href="https://arxiv.org/pdf/0802.4273">pdf</a>, <a href="https://arxiv.org/ps/0802.4273">ps</a>, <a href="https://arxiv.org/format/0802.4273">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.77.184418">10.1103/PhysRevB.77.184418 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Chromium at High Pressures: Weak Coupling and Strong Fluctuations in an Itinerant Antiferromagnet </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jaramillo%2C+R">R. Jaramillo</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+Y">Yejun Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Lang%2C+J+C">J. C. Lang</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Srajer%2C+G">G. Srajer</a>, <a href="/search/cond-mat?searchtype=author&query=Ronnow%2C+H+M">H. M. Ronnow</a>, <a href="/search/cond-mat?searchtype=author&query=Littlewood%2C+P+B">P. B. Littlewood</a>, <a href="/search/cond-mat?searchtype=author&query=Rosenbaum%2C+T+F">T. F. Rosenbaum</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="0802.4273v1-abstract-short" style="display: inline;"> The spin- and charge-density-wave order parameters of the itinerant antiferromagnet chromium are measured directly with non-resonant x-ray diffraction as the system is driven towards its quantum critical point with high pressure using a diamond anvil cell. The exponential decrease of the spin and charge diffraction intensities with pressure confirms the harmonic scaling of spin and charge, while… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0802.4273v1-abstract-full').style.display = 'inline'; document.getElementById('0802.4273v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0802.4273v1-abstract-full" style="display: none;"> The spin- and charge-density-wave order parameters of the itinerant antiferromagnet chromium are measured directly with non-resonant x-ray diffraction as the system is driven towards its quantum critical point with high pressure using a diamond anvil cell. The exponential decrease of the spin and charge diffraction intensities with pressure confirms the harmonic scaling of spin and charge, while the evolution of the incommensurate ordering vector provides important insight into the difference between pressure and chemical doping as means of driving quantum phase transitions. Measurement of the charge density wave over more than two orders of magnitude of diffraction intensity provides the clearest demonstration to date of a weakly-coupled, BCS-like ground state. Evidence for the coexistence of this weakly-coupled ground state with high-energy excitations and pseudogap formation above the ordering temperature in chromium, the charge-ordered perovskite manganites, and the blue bronzes, among other such systems, raises fundamental questions about the distinctions between weak and strong coupling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0802.4273v1-abstract-full').style.display = 'none'; document.getElementById('0802.4273v1-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, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">11 pages, 9 figures (8 in color)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0708.1778">arXiv:0708.1778</a> <span> [<a href="https://arxiv.org/pdf/0708.1778">pdf</a>, <a href="https://arxiv.org/format/0708.1778">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.99.137201">10.1103/PhysRevLett.99.137201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pressure-Tuned Spin and Charge Ordering in an Itinerant Antiferromagnet </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Feng%2C+Y">Yejun Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Jaramillo%2C+R">R. Jaramillo</a>, <a href="/search/cond-mat?searchtype=author&query=Srajer%2C+G">G. Srajer</a>, <a href="/search/cond-mat?searchtype=author&query=Lang%2C+J+C">J. C. Lang</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Somayazulu%2C+M+S">M. S. Somayazulu</a>, <a href="/search/cond-mat?searchtype=author&query=Shpyrko%2C+O+G">O. G. Shpyrko</a>, <a href="/search/cond-mat?searchtype=author&query=Pluth%2C+J+J">J. J. Pluth</a>, <a href="/search/cond-mat?searchtype=author&query=Mao%2C+H+-">H. -k. Mao</a>, <a href="/search/cond-mat?searchtype=author&query=Isaacs%2C+E+D">E. D. Isaacs</a>, <a href="/search/cond-mat?searchtype=author&query=Aeppli%2C+G">G. Aeppli</a>, <a href="/search/cond-mat?searchtype=author&query=Rosenbaum%2C+T+F">T. F. Rosenbaum</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="0708.1778v1-abstract-short" style="display: inline;"> Elemental chromium orders antiferromagnetically near room temperature, but the ordering temperature can be driven to zero by applying large pressures. We combine diamond anvil cell and synchrotron x-ray diffraction techniques to measure directly the spin and charge order in the pure metal at the approach to its quantum critical point. Both spin and charge order are suppressed exponentially with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0708.1778v1-abstract-full').style.display = 'inline'; document.getElementById('0708.1778v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0708.1778v1-abstract-full" style="display: none;"> Elemental chromium orders antiferromagnetically near room temperature, but the ordering temperature can be driven to zero by applying large pressures. We combine diamond anvil cell and synchrotron x-ray diffraction techniques to measure directly the spin and charge order in the pure metal at the approach to its quantum critical point. Both spin and charge order are suppressed exponentially with pressure, well beyond the region where disorder cuts off such a simple evolution, and they maintain a harmonic scaling relationship over decades in scattering intensity. By comparing the development of the order parameter with that of the magnetic wavevector, it is possible to ascribe the destruction of antiferromagnetism to the growth in electron kinetic energy relative to the underlying magnetic exchange interaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0708.1778v1-abstract-full').style.display = 'none'; document.getElementById('0708.1778v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 August, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2007. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0607292">arXiv:cond-mat/0607292</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0607292">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0607292">ps</a>, <a href="https://arxiv.org/format/cond-mat/0607292">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.74.064502">10.1103/PhysRevB.74.064502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic field induced orientation of superconducting MgB$_2$ crystallites determined by X-ray diffraction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">J. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Vaknin%2C+D">D. Vaknin</a>, <a href="/search/cond-mat?searchtype=author&query=Bud%27ko%2C+S+L">S. L. Bud'ko</a>, <a href="/search/cond-mat?searchtype=author&query=Canfield%2C+P+C">P. C. Canfield</a>, <a href="/search/cond-mat?searchtype=author&query=Pal%2C+D">D. Pal</a>, <a href="/search/cond-mat?searchtype=author&query=Eskildsen%2C+M+R">M. R. Eskildsen</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Kogan%2C+V+G">V. G. Kogan</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="cond-mat/0607292v2-abstract-short" style="display: inline;"> X-ray diffraction studies of fine polycrystalline samples of MgB$_2$ in the superconducting state reveal that crystals orient with their \emph{c}-axis in a plane normal to the direction of the applied magnetic field. The MgB$_2$ samples were thoroughly ground to obtain average grain size 5 - 10 $渭$m in order to increase the population of free single crystal grains in the powder. By monitoring Br… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0607292v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0607292v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0607292v2-abstract-full" style="display: none;"> X-ray diffraction studies of fine polycrystalline samples of MgB$_2$ in the superconducting state reveal that crystals orient with their \emph{c}-axis in a plane normal to the direction of the applied magnetic field. The MgB$_2$ samples were thoroughly ground to obtain average grain size 5 - 10 $渭$m in order to increase the population of free single crystal grains in the powder. By monitoring Bragg reflections in a plane normal to an applied magnetic field we find that the powder is textured with significantly stronger (\emph{0,0,l}) reflections in comparison to (\emph{h,k,0}), which remain essentially unchanged. The orientation of the crystals with the \emph{ab}-plane parallel to the magnetic field at all temperatures below $T_c$ demonstrates that the sign of the torque under magnetic field does not alter, in disagreement with current theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0607292v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0607292v2-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 July, 2006; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 July, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2006. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0512560">arXiv:cond-mat/0512560</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0512560">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0512560">ps</a>, <a href="https://arxiv.org/format/cond-mat/0512560">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.73.100407">10.1103/PhysRevB.73.100407 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Low temperature structural phase transition and incommensurate lattice modulation in the spin gap compound BaCuSi2O6 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Samulon%2C+E+C">E. C. Samulon</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Sebastian%2C+S+E">S. E. Sebastian</a>, <a href="/search/cond-mat?searchtype=author&query=Brooks%2C+P+B">P. B. Brooks</a>, <a href="/search/cond-mat?searchtype=author&query=McCourt%2C+M+K">M. K. McCourt Jr.</a>, <a href="/search/cond-mat?searchtype=author&query=Ilavsky%2C+J">J. Ilavsky</a>, <a href="/search/cond-mat?searchtype=author&query=Fisher%2C+I+R">I. R. Fisher</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="cond-mat/0512560v1-abstract-short" style="display: inline;"> Results of high resolution x-ray diffraction experiments are presented for single crystals of the spin gap compound BaCuSi$_2$O$_6$ in the temperature range from 16 to 300 K. The data show clear evidence of a transition from the room temperature tetragonal phase into an incommensurately modulated orthorhombic structure below $\sim$100 K. This lattice modulation is characterized by a resolution l… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0512560v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0512560v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0512560v1-abstract-full" style="display: none;"> Results of high resolution x-ray diffraction experiments are presented for single crystals of the spin gap compound BaCuSi$_2$O$_6$ in the temperature range from 16 to 300 K. The data show clear evidence of a transition from the room temperature tetragonal phase into an incommensurately modulated orthorhombic structure below $\sim$100 K. This lattice modulation is characterized by a resolution limited wave vector {\bf q}$_{IC}$=(0,$\sim$0.13,0) and its 2$^{nd}$ and 3$^{rd}$ harmonics. The phase transition is first order and exhibits considerable hysteresis. This observation implies that the spin Hamiltonian representing the system is more complex than originally thought. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0512560v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0512560v1-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 December, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2005. </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/cond-mat/0507505">arXiv:cond-mat/0507505</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0507505">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0507505">ps</a>, <a href="https://arxiv.org/format/cond-mat/0507505">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> </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.73.174505">10.1103/PhysRevB.73.174505 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Two and Three Dimensional Incommensurate Modulation in Optimally-Doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+未}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Castellan%2C+J+P">J. P. Castellan</a>, <a href="/search/cond-mat?searchtype=author&query=Gaulin%2C+B+D">B. D. Gaulin</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=Nabialek%2C+A">A. Nabialek</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+G">G. Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Islam%2C+Z">Z. Islam</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+X">X. Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Sinha%2C+S+K">S. K. Sinha</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="cond-mat/0507505v1-abstract-short" style="display: inline;"> X-ray scattering measurements on optimally-doped single crystal samples of the high temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+未}$ reveal the presence of three distinct incommensurate charge modulations, each involving a roughly fivefold increase in the unit cell dimension along the {\bf b}-direction. The strongest scattering comes from the well known (H, K$\pm$ 0.21, L) modulation and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0507505v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0507505v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0507505v1-abstract-full" style="display: none;"> X-ray scattering measurements on optimally-doped single crystal samples of the high temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+未}$ reveal the presence of three distinct incommensurate charge modulations, each involving a roughly fivefold increase in the unit cell dimension along the {\bf b}-direction. The strongest scattering comes from the well known (H, K$\pm$ 0.21, L) modulation and its harmonics. However, we also observe broad diffraction which peak up at the L values complementary to those which characterize the known modulated structure. These diffraction features correspond to correlation lengths of roughly a unit cell dimension, $尉_c$$\sim$20 $脜$ in the {\bf c} direction, and of $尉_b$$\sim$ 185 $脜$ parallel to the incommensurate wavevector. We interpret these features as arising from three dimensional incommensurate domains and the interfaces between them, respectively. In addition we investigate the recently discovered incommensuate modulations which peak up at (1/2, K$\pm$ 0.21, L) and related wavevectors. Here we explicitly study the L-dependence of this scattering and see that these charge modulations are two dimensional in nature with weak correlations on the scale of a bilayer thickness, and that they correspond to short range, isotropic correlation lengths within the basal plane. We relate these new incommensurate modulations to the electronic nanostructure observed in Bi$_2$Sr$_2$CaCu$_2$O$_{8+未}$ using STM topography. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0507505v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0507505v1-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 July, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2005. </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, 8 figures</span> </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a 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