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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.16640">arXiv:2412.16640</a> <span> [<a href="https://arxiv.org/pdf/2412.16640">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"> Three-dimensional nucleation and growth of deformation twins in magnesium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S">Sangwon Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Pilipchuk%2C+M">Michael Pilipchuk</a>, <a href="/search/cond-mat?searchtype=author&query=Yildirim%2C+C">Can Yildirim</a>, <a href="/search/cond-mat?searchtype=author&query=Greeley%2C+D">Duncan Greeley</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Q">Qianying Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Berman%2C+T+D">Tracy D. Berman</a>, <a href="/search/cond-mat?searchtype=author&query=Creuziger%2C+A">Adam Creuziger</a>, <a href="/search/cond-mat?searchtype=author&query=Rust%2C+E">Evan Rust</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Sundararaghavan%2C+V">Veera Sundararaghavan</a>, <a href="/search/cond-mat?searchtype=author&query=Allison%2C+J+E">John E. Allison</a>, <a href="/search/cond-mat?searchtype=author&query=Bucsek%2C+A">Ashley Bucsek</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="2412.16640v1-abstract-short" style="display: inline;"> At two-thirds the weight of aluminum, magnesium alloys have the potential to significantly reduce the fuel consumption of transportation vehicles. These advancements depend on our ability to optimize the desirable versus undesirable effects of deformation twins: three dimensional (3D) microstructural domains that form under mechanical stresses. Previously only characterized using surface or thin-f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.16640v1-abstract-full').style.display = 'inline'; document.getElementById('2412.16640v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.16640v1-abstract-full" style="display: none;"> At two-thirds the weight of aluminum, magnesium alloys have the potential to significantly reduce the fuel consumption of transportation vehicles. These advancements depend on our ability to optimize the desirable versus undesirable effects of deformation twins: three dimensional (3D) microstructural domains that form under mechanical stresses. Previously only characterized using surface or thin-film measurements, here, we present the first 3D in-situ characterization of deformation twinning inside an embedded grain over mesoscopic fields of view using dark-field X-ray microscopy supported by crystal plasticity finite element analysis. The results reveal the important role of triple junctions on twin nucleation, that twin growth behavior is irregular and can occur in several directions simultaneously, and that twin-grain and twin-twin junctions are the sites of localized dislocation accumulation, a necessary precursor to crack initiation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.16640v1-abstract-full').style.display = 'none'; document.getElementById('2412.16640v1-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.13391">arXiv:2410.13391</a> <span> [<a href="https://arxiv.org/pdf/2410.13391">pdf</a>, <a href="https://arxiv.org/format/2410.13391">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="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> The ESRF dark-field x-ray microscope at ID03 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Isern%2C+H">H. Isern</a>, <a href="/search/cond-mat?searchtype=author&query=Brochard%2C+T">T. Brochard</a>, <a href="/search/cond-mat?searchtype=author&query=Dufrane%2C+T">T. Dufrane</a>, <a href="/search/cond-mat?searchtype=author&query=Brumund%2C+P">P. Brumund</a>, <a href="/search/cond-mat?searchtype=author&query=Papillon%2C+E">E. Papillon</a>, <a href="/search/cond-mat?searchtype=author&query=Scortani%2C+D">D. Scortani</a>, <a href="/search/cond-mat?searchtype=author&query=Hino%2C+R">R. Hino</a>, <a href="/search/cond-mat?searchtype=author&query=Yildirim%2C+C">C. Yildirim</a>, <a href="/search/cond-mat?searchtype=author&query=Lamas%2C+R+R">R. Rodriguez Lamas</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Y. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Sarkis%2C+M">M. Sarkis</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</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="2410.13391v1-abstract-short" style="display: inline;"> Dark Field X-ray Microscopy (DFXM) is a full-field imaging technique for non-destructive 3D mapping of orientation and strain in crystalline elements. The new DFXM beamline at ID03, developed as part of the ESRF Phase II Upgrade Project (EBSL2), was designed to provide cutting-edge capabilities for studying embedded microstructures. The project relocated and upgraded the end station from ID06-HXM… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.13391v1-abstract-full').style.display = 'inline'; document.getElementById('2410.13391v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.13391v1-abstract-full" style="display: none;"> Dark Field X-ray Microscopy (DFXM) is a full-field imaging technique for non-destructive 3D mapping of orientation and strain in crystalline elements. The new DFXM beamline at ID03, developed as part of the ESRF Phase II Upgrade Project (EBSL2), was designed to provide cutting-edge capabilities for studying embedded microstructures. The project relocated and upgraded the end station from ID06-HXM to ID03, integrating new X-ray optics, radiation hutches, and a source device optimized for this advanced technique. Notable improvements include a near-field camera, a new goniometer, and a high-resolution far-field camera. The conceptual design was completed in September 2019, followed by the technical design in March 2021, with first users welcomed in April 2024. Building on the success of the original instrument, the ID03 beamline offers enhanced multi-scale and multi-modal mapping of microstructures with high resolution, enabling in-situ exploration of complex phenomena. Applications range from strain and orientation mapping in metals to studies of functional materials, semiconductors, biominerals, and energy systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.13391v1-abstract-full').style.display = 'none'; document.getElementById('2410.13391v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.08468">arXiv:2406.08468</a> <span> [<a href="https://arxiv.org/pdf/2406.08468">pdf</a>, <a href="https://arxiv.org/format/2406.08468">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"> Observing formation and evolution of dislocation cells during plastic deformation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zelenika%2C+A">Albert Zelenika</a>, <a href="/search/cond-mat?searchtype=author&query=Cretton%2C+A+A+W">Adam Andr茅 William Cretton</a>, <a href="/search/cond-mat?searchtype=author&query=Frankus%2C+F">Felix Frankus</a>, <a href="/search/cond-mat?searchtype=author&query=Borgi%2C+S">Sina Borgi</a>, <a href="/search/cond-mat?searchtype=author&query=Grumsen%2C+F+B">Flemming B. Grumsen</a>, <a href="/search/cond-mat?searchtype=author&query=Yildirim%2C+C">Can Yildirim</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Winther%2C+G">Grethe Winther</a>, <a href="/search/cond-mat?searchtype=author&query=Poulsen%2C+H+F">Henning Friis Poulsen</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="2406.08468v1-abstract-short" style="display: inline;"> During plastic deformation of metals and alloys, dislocations self-organise in cells, which subsequently continuously decrease in size. How and when these processes take place has remained elusive, because observations of the structural dynamics in the bulk have not been feasible. We here present X-ray diffraction microscopy movies of the structural evolution during tensile deformation of a mm-siz… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.08468v1-abstract-full').style.display = 'inline'; document.getElementById('2406.08468v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.08468v1-abstract-full" style="display: none;"> During plastic deformation of metals and alloys, dislocations self-organise in cells, which subsequently continuously decrease in size. How and when these processes take place has remained elusive, because observations of the structural dynamics in the bulk have not been feasible. We here present X-ray diffraction microscopy movies of the structural evolution during tensile deformation of a mm-sized aluminium (111) single crystal. The formation and subsequent development of 40,000 cells are visualised. We reveal that cells form in a stochastic and isotropic manner already at 1% strain. We show that the cell size and dislocation density distributions are log-normal and bi-modal Gaussian distributions, respectively, throughout. This insight leads to an interpretation of the formation and evolution steps in terms of universal stochastic multiplicative processes. This work will guide dislocation dynamics modelling, as it provides unique results on cell formation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.08468v1-abstract-full').style.display = 'none'; document.getElementById('2406.08468v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.06497">arXiv:2401.06497</a> <span> [<a href="https://arxiv.org/pdf/2401.06497">pdf</a>, <a href="https://arxiv.org/format/2401.06497">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"> Spatially resolved mapping of coherent twin relationships in DFXM measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Carlsen%2C+M">Mads Carlsen</a>, <a href="/search/cond-mat?searchtype=author&query=Hoefling%2C+M">Marion Hoefling</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Simons%2C+H">Hugh Simons</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="2401.06497v1-abstract-short" style="display: inline;"> With dark firld x-ray microscopy, it is possible to measure reciprocal space manps of localized volumes embedded deeply in a large sample. Ferroelastic materials contains elastic twins that display characteristing splitting of diffraction peaks. We show how to utilize established methods for analysing reciprocal space maps of elastically twinned materials to the analysis of dark-field x-ray micros… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.06497v1-abstract-full').style.display = 'inline'; document.getElementById('2401.06497v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.06497v1-abstract-full" style="display: none;"> With dark firld x-ray microscopy, it is possible to measure reciprocal space manps of localized volumes embedded deeply in a large sample. Ferroelastic materials contains elastic twins that display characteristing splitting of diffraction peaks. We show how to utilize established methods for analysing reciprocal space maps of elastically twinned materials to the analysis of dark-field x-ray microscopy data to detemin the exact kind of domain wall present in each probed volume, even when the domains are not spatially resolved. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.06497v1-abstract-full').style.display = 'none'; document.getElementById('2401.06497v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.06456">arXiv:2306.06456</a> <span> [<a href="https://arxiv.org/pdf/2306.06456">pdf</a>, <a href="https://arxiv.org/format/2306.06456">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"> 3D Microstructural and Strain Evolution During the Early Stages of Tensile Deformation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zelenika%2C+A">Albert Zelenika</a>, <a href="/search/cond-mat?searchtype=author&query=Yildirim%2C+C">Can Yildirim</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Rodriguez-Lamas%2C+R">Raquel Rodriguez-Lamas</a>, <a href="/search/cond-mat?searchtype=author&query=Grumsen%2C+F+B">Flemming B. Grumsen</a>, <a href="/search/cond-mat?searchtype=author&query=Poulsen%2C+H+F">Henning F. Poulsen</a>, <a href="/search/cond-mat?searchtype=author&query=Winther%2C+G">Grethe Winther</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="2306.06456v1-abstract-short" style="display: inline;"> Dislocation patterning and self-organization during plastic deformation are associated with work hardening, but the exact mechanisms remain elusive. This is partly because studies of the structure and local strain during the initial stages of plastic deformation has been a challenge. Here we use Dark Field X-ray Microscopy to generate 3D maps of embedded $350 \times 900 \times 72 \,渭\mathrm{m}^3$… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.06456v1-abstract-full').style.display = 'inline'; document.getElementById('2306.06456v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.06456v1-abstract-full" style="display: none;"> Dislocation patterning and self-organization during plastic deformation are associated with work hardening, but the exact mechanisms remain elusive. This is partly because studies of the structure and local strain during the initial stages of plastic deformation has been a challenge. Here we use Dark Field X-ray Microscopy to generate 3D maps of embedded $350 \times 900 \times 72 \,渭\mathrm{m}^3$ volumes within three pure Al single crystals, all oriented for double slip on the primary and conjugate slip systems. These were tensile deformed by 0.6$\%$, 1.7$\%$ and 3.6$\%$, respectively. Orientation maps revealed the existence of two distinct types of planar dislocation boundaries both at 0.6$\%$ and 1.7$\%$ but no systematic patterning. At 3.6$\%$, these boundaries have evolved into a well-defined checkerboard pattern, characteristic of Geometrically Necessary Boundaries, GNBs. The GNB spacing is $\approx$ 14 $渭$m and the misorientation $\approx$ 0.2掳, in fair agreement with those at higher strains. By contrast to the sharp boundaries observed at higher strains, the boundaries are associated with a sinusoidal orientation gradient. Maps of the elastic strain along the (111) direction exhibit fluctuations of $\pm 0.0002 $ with an average domain size of 3 $渭$m. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.06456v1-abstract-full').style.display = 'none'; document.getElementById('2306.06456v1-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 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.04764">arXiv:2303.04764</a> <span> [<a href="https://arxiv.org/pdf/2303.04764">pdf</a>, <a href="https://arxiv.org/format/2303.04764">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"> High Resolution 3D Strain and Orientation Mapping within a Grain of a Directed Energy Deposition Laser Additively Manufactured Superalloy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Y+T">Y. T. Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Collins%2C+D+M">D. M. Collins</a>, <a href="/search/cond-mat?searchtype=author&query=Clark%2C+S+J">S. J. Clark</a>, <a href="/search/cond-mat?searchtype=author&query=Ludwig%2C+W">W. Ludwig</a>, <a href="/search/cond-mat?searchtype=author&query=Rodriguez-Lamas%2C+R">R. Rodriguez-Lamas</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Reed%2C+R+C">R. C. Reed</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+P+D">P. D. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Withers%2C+P+J">P. J. Withers</a>, <a href="/search/cond-mat?searchtype=author&query=Yildirim%2C+C">C. Yildirim</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="2303.04764v1-abstract-short" style="display: inline;"> The industrialization of Laser Additive Manufacturing (LAM) is challenged by the undesirable microstructures and high residual stresses originating from the fast and complex solidification process. Non-destructive assessment of the mechanical performance controlling deformation patterning is therefore critical. Here, we use Dark Field X-ray Microscopy (DFXM) to non-destructively map the 3D intragr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.04764v1-abstract-full').style.display = 'inline'; document.getElementById('2303.04764v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.04764v1-abstract-full" style="display: none;"> The industrialization of Laser Additive Manufacturing (LAM) is challenged by the undesirable microstructures and high residual stresses originating from the fast and complex solidification process. Non-destructive assessment of the mechanical performance controlling deformation patterning is therefore critical. Here, we use Dark Field X-ray Microscopy (DFXM) to non-destructively map the 3D intragranular orientation and strain variations throughout a surface breaking grain within a directed energy deposition nickel superalloy. DFXM results reveal a highly heterogenous 3D microstructure in terms of the local orientation and lattice strain. The grain comprises $\approx$ 5$渭$m-sized cells with alternating strain states, as high as 5 $\times 10^{-3}$, and orientation differences <0.5掳 . The DFXM results are compared to Electron Backscatter Diffraction measurements of the same grain from its cut-off surface. We discuss the microstructure developments during LAM, rationalising the development of the deformation patterning from the extreme thermal gradients during processing and the susceptibility for solute segregation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.04764v1-abstract-full').style.display = 'none'; document.getElementById('2303.04764v1-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 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">Corresponding author:can.yildirim@esrf.fr - Submitted to Scripta Materialia on 8 March2 023</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.14284">arXiv:2208.14284</a> <span> [<a href="https://arxiv.org/pdf/2208.14284">pdf</a>, <a href="https://arxiv.org/format/2208.14284">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"> Extensive 3D Mapping of Dislocation Structures in Bulk Aluminum </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Yildirim%2C+C">Can Yildirim</a>, <a href="/search/cond-mat?searchtype=author&query=Poulsen%2C+H+F">Henning F. Poulsen</a>, <a href="/search/cond-mat?searchtype=author&query=Winther%2C+G">Grethe Winther</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+P+H">Pin H. Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Dresselhaus-Marais%2C+L+E">Leora E. Dresselhaus-Marais</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.14284v1-abstract-short" style="display: inline;"> Thermomechanical processing such as annealing is one of the main methods to tailor the mechanical properties of materials, however, much is unknown about the reorganization of dislocation structures deep inside macroscopic crystals that give rise to those changes. Here, we demonstrate the self-organization of dislocation structures upon high-temperature annealing in a mm-sized single crystal of al… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.14284v1-abstract-full').style.display = 'inline'; document.getElementById('2208.14284v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.14284v1-abstract-full" style="display: none;"> Thermomechanical processing such as annealing is one of the main methods to tailor the mechanical properties of materials, however, much is unknown about the reorganization of dislocation structures deep inside macroscopic crystals that give rise to those changes. Here, we demonstrate the self-organization of dislocation structures upon high-temperature annealing in a mm-sized single crystal of aluminum. We map a large embedded 3D volume ($100\times300\times300$ $渭$m$^3$) of dislocation structures using dark field x-ray microscopy (DFXM), a diffraction-based imaging technique. Over the wide field of view, DFXM's high angular resolution allows us to identify subgrains, separated by dislocation boundaries, which we identify and characterize down to the single-dislocation level using computer-vision methods. We demonstrate how even after long annealing times at high temperatures, the remaining low density of dislocations still pack into well-defined, straight dislocation boundaries (DBs) that lie on specific crystallographic planes. In contrast to conventional grain growth models, our results show that the dihedral angles at the triple junctions are not the predicted 120$\degree$, suggesting additional complexities in the boundary stabilization mechanisms. Mapping the local misorientation and lattice strain around these boundaries shows that the observed strain is shear, imparting an average misorientation around the DB of $\approx 0.003-0.006 \degree{}$ <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.14284v1-abstract-full').style.display = 'none'; document.getElementById('2208.14284v1-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 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.05494">arXiv:2205.05494</a> <span> [<a href="https://arxiv.org/pdf/2205.05494">pdf</a>, <a href="https://arxiv.org/format/2205.05494">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"> darfix: Data analysis for dark-field X-ray microscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ferrer%2C+J+G">J煤lia Garriga Ferrer</a>, <a href="/search/cond-mat?searchtype=author&query=Rodr%C3%ADguez-Lamas%2C+R">Raquel Rodr铆guez-Lamas</a>, <a href="/search/cond-mat?searchtype=author&query=Payno%2C+H">Henri Payno</a>, <a href="/search/cond-mat?searchtype=author&query=De+Nolf%2C+W">Wout De Nolf</a>, <a href="/search/cond-mat?searchtype=author&query=Cook%2C+P">Phil Cook</a>, <a href="/search/cond-mat?searchtype=author&query=Jover%2C+V+A+S">Vicente Armando Sol茅 Jover</a>, <a href="/search/cond-mat?searchtype=author&query=Favre-Nicolin%2C+V">Vincent Favre-Nicolin</a>, <a href="/search/cond-mat?searchtype=author&query=Y%C4%B1ld%C4%B1r%C4%B1m%2C+C">Can Y谋ld谋r谋m</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</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="2205.05494v1-abstract-short" style="display: inline;"> A Python package for the analysis of dark-field X-ray microscopy (DFXM) and rocking curve imaging (RCI) data is presented. \textit{darfix} provides a set of data processing and visualization tools that can be either imported as library components or accessed through a graphical user interface (GUI) as an Orange add-on. In the latter case, the different analysis modules can be easily chained to def… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.05494v1-abstract-full').style.display = 'inline'; document.getElementById('2205.05494v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.05494v1-abstract-full" style="display: none;"> A Python package for the analysis of dark-field X-ray microscopy (DFXM) and rocking curve imaging (RCI) data is presented. \textit{darfix} provides a set of data processing and visualization tools that can be either imported as library components or accessed through a graphical user interface (GUI) as an Orange add-on. In the latter case, the different analysis modules can be easily chained to define computational workflows. Operations on larger-than-memory image sets are supported through the implementation of online versions of the data processing algorithms, effectively trading performance for feasibility when the computing resources are limited. The software can automatically extract the relevant instrument angle settings from the input files metadata. The currently available input file format is EDF and in future releases HDF5 will be incorporated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.05494v1-abstract-full').style.display = 'none'; document.getElementById('2205.05494v1-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 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">A data analysis package intended for x-ray imaging. The manuscript is to be submitted to Journal of Synchrotron Radiation</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.07549">arXiv:2201.07549</a> <span> [<a href="https://arxiv.org/pdf/2201.07549">pdf</a>, <a href="https://arxiv.org/format/2201.07549">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"> Simulating dark-field x-ray microscopy images with wave front propagation techniques </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Carlsen%2C+M">Mads Carlsen</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Yildirim%2C+C">Can Yildirim</a>, <a href="/search/cond-mat?searchtype=author&query=R%C3%A6der%2C+T">Trygve R忙der</a>, <a href="/search/cond-mat?searchtype=author&query=Simons%2C+H">Hugh Simons</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="2201.07549v2-abstract-short" style="display: inline;"> Dark-Field X-ray Microscopy (DFXM) is a diffraction-based synchrotron imaging techique capable of imaging defects in the bulk of extended crystalline samples. We present numerical simulations of image-formation in such a microscope using numerical integration of the dynamical Takagi-Taupin Equations (TTE) and wave front propagation. We validate our approach by comparing simulated images to experim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.07549v2-abstract-full').style.display = 'inline'; document.getElementById('2201.07549v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.07549v2-abstract-full" style="display: none;"> Dark-Field X-ray Microscopy (DFXM) is a diffraction-based synchrotron imaging techique capable of imaging defects in the bulk of extended crystalline samples. We present numerical simulations of image-formation in such a microscope using numerical integration of the dynamical Takagi-Taupin Equations (TTE) and wave front propagation. We validate our approach by comparing simulated images to experimental data from a near-perfect single crystal of diamond containing a single stacking fault defect in the illuminated volume. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.07549v2-abstract-full').style.display = 'none'; document.getElementById('2201.07549v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.14311">arXiv:2110.14311</a> <span> [<a href="https://arxiv.org/pdf/2110.14311">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="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Identification of coherent twin relationship from high-resolution reciprocal space maps </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gorfman%2C+S">Semen Gorfman</a>, <a href="/search/cond-mat?searchtype=author&query=Spirito%2C+D">David Spirito</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+G">Guanjie Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+N">Nan Zhang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.14311v1-abstract-short" style="display: inline;"> Twinning is a common crystallographic phenomenon, which usually occurs in crystals during symmetry-lowering phase transition. Once formed, twin domains play an important role in defining physical properties: for example, twin domains underpin the giant piezoelectric effect in ferroelectrics, superelasticity in ferroelastics and the shape-memory effect in martensitic alloys. Unfortunately, there is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.14311v1-abstract-full').style.display = 'inline'; document.getElementById('2110.14311v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.14311v1-abstract-full" style="display: none;"> Twinning is a common crystallographic phenomenon, which usually occurs in crystals during symmetry-lowering phase transition. Once formed, twin domains play an important role in defining physical properties: for example, twin domains underpin the giant piezoelectric effect in ferroelectrics, superelasticity in ferroelastics and the shape-memory effect in martensitic alloys. Unfortunately, there is still a lack of experimental methods for imaging and characterization of twin domain patterns. Here, we propose a theoretical framework and an algorithm for the recognition of twinned pairs of ferroelastic domains and the identification of the coherent twin relationship using high-resolution reciprocal space mapping of X-ray diffraction intensity around split Bragg peaks. Specifically, we adapt the geometrical theory of twinned ferroelastic crystals (Fousek & Janovec, 1969) for the analysis of the X-ray diffraction patterns. We derive the necessary equations and outline an algorithm for calculation of the separation between the Bragg peaks, diffracted from possible coherent twin domains, connected to one another via mismatch-free interface. We demonstrate that such separation is always perpendicular to the planar interface between mechanically matched domains. As examples, we present the analysis of the separation between the peaks diffracted from tetragonal and rhombohedral domains in the high-resolution reciprocal space maps of BaTiO3 and PbZr1-xTixO3 crystals. The demonstrated method can be used to analyse the response of multi-domain patterns to external perturbations such as electric field, change of a temperature or pressure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.14311v1-abstract-full').style.display = 'none'; document.getElementById('2110.14311v1-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, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages, 10 figures, Appendix, Supporting materials</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.05083">arXiv:2009.05083</a> <span> [<a href="https://arxiv.org/pdf/2009.05083">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="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</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/sciadv.abe8311">10.1126/sciadv.abe8311 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-Situ Visualization of Long-Range Defect Interactions at the Edge of Melting </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Dresselhaus-Marais%2C+L+E">Leora E. Dresselhaus-Marais</a>, <a href="/search/cond-mat?searchtype=author&query=Winther%2C+G">Grethe Winther</a>, <a href="/search/cond-mat?searchtype=author&query=Howard%2C+M">Marylesa Howard</a>, <a href="/search/cond-mat?searchtype=author&query=Gonzalez%2C+A">Arnulfo Gonzalez</a>, <a href="/search/cond-mat?searchtype=author&query=Breckling%2C+S+R">Sean R. Breckling</a>, <a href="/search/cond-mat?searchtype=author&query=Yildirim%2C+C">Can Yildirim</a>, <a href="/search/cond-mat?searchtype=author&query=Cook%2C+P+K">Philip K. Cook</a>, <a href="/search/cond-mat?searchtype=author&query=Kutsal%2C+M">Mustafacan Kutsal</a>, <a href="/search/cond-mat?searchtype=author&query=Simons%2C+H">Hugh Simons</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Eggert%2C+J+H">Jon H. Eggert</a>, <a href="/search/cond-mat?searchtype=author&query=Poulsen%2C+H+F">Henning Friis Poulsen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.05083v2-abstract-short" style="display: inline;"> Connecting a bulk material's microscopic defects to its macroscopic properties is an age-old problem in materials science. Long-range interactions between dislocations (line defects) are known to play a key role in how materials deform or melt, but we lack the tools to connect these dynamics to the macroscopic properties. We introduce time-resolved dark-field X-ray microscopy to directly visualize… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.05083v2-abstract-full').style.display = 'inline'; document.getElementById('2009.05083v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.05083v2-abstract-full" style="display: none;"> Connecting a bulk material's microscopic defects to its macroscopic properties is an age-old problem in materials science. Long-range interactions between dislocations (line defects) are known to play a key role in how materials deform or melt, but we lack the tools to connect these dynamics to the macroscopic properties. We introduce time-resolved dark-field X-ray microscopy to directly visualize how dislocations move and interact over hundreds of micrometers, deep inside bulk aluminum. With real-time movies, we reveal the thermally-activated motion and interactions of dislocations that comprise a boundary, and show how weakened binding forces inhomogeneously destabilize the structure at 99% of the melting temperature. Connecting dynamics of the microstructure to its stability, we provide important opportunities to guide and validate multiscale models that are yet untested. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.05083v2-abstract-full').style.display = 'none'; document.getElementById('2009.05083v2-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 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science Advances, 7, 29, abe8311 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.09475">arXiv:2007.09475</a> <span> [<a href="https://arxiv.org/pdf/2007.09475">pdf</a>, <a href="https://arxiv.org/format/2007.09475">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="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Geometrical Optics Formalism to Model Contrast in Dark-Field X-ray Microscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Poulsen%2C+H+F">H. F. Poulsen</a>, <a href="/search/cond-mat?searchtype=author&query=Dresselhaus-Marais%2C+L+E">L. E. Dresselhaus-Marais</a>, <a href="/search/cond-mat?searchtype=author&query=Carlsen%2C+M+A">M. A. Carlsen</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Winther%2C+G">G. Winther</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="2007.09475v1-abstract-short" style="display: inline;"> Dark-field X-ray microscopy is a new full-field imaging technique that nondestructively maps the structure and local strain inside deeply embedded crystalline elements in three dimensions. Placing an objective lens in the diffracted beam generates a magnified projection image of a local volume. We provide a general formalism based on geometrical optics for the diffraction imaging, valid for any cr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.09475v1-abstract-full').style.display = 'inline'; document.getElementById('2007.09475v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.09475v1-abstract-full" style="display: none;"> Dark-field X-ray microscopy is a new full-field imaging technique that nondestructively maps the structure and local strain inside deeply embedded crystalline elements in three dimensions. Placing an objective lens in the diffracted beam generates a magnified projection image of a local volume. We provide a general formalism based on geometrical optics for the diffraction imaging, valid for any crystallographic space group. This allows simulation of diffraction images based on micro-mechanical models. We present example simulations with the formalism, demonstrating how it may be used to design new experiments or interpret existing ones. In particular, we show how modifications to the experimental design may tailor the reciprocal-space resolution function to map specific components of the deformation gradient tensor. The formalism supports multi-length scale experiments, as it enables DFXM to be interfaced with 3DXRD. The formalism is demonstrated by comparison to experimental images of the strain field around a straight dislocation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.09475v1-abstract-full').style.display = 'none'; document.getElementById('2007.09475v1-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, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Applied Crystallography, 54, 6 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1912.01255">arXiv:1912.01255</a> <span> [<a href="https://arxiv.org/pdf/1912.01255">pdf</a>, <a href="https://arxiv.org/format/1912.01255">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="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/10.1063/1.5141139">10.1063/1.5141139 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Mirror Furnace for Synchrotron Dark Field X-ray Microscopy Experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Yildirim%2C+C">C. Yildirim</a>, <a href="/search/cond-mat?searchtype=author&query=Vitoux%2C+H">H. Vitoux</a>, <a href="/search/cond-mat?searchtype=author&query=Dresselhaus-Cooper%2C+L+E">L. E. Dresselhaus-Cooper</a>, <a href="/search/cond-mat?searchtype=author&query=Steinmann%2C+R">R. Steinmann</a>, <a href="/search/cond-mat?searchtype=author&query=Watier%2C+Y">Y. Watier</a>, <a href="/search/cond-mat?searchtype=author&query=Cook%2C+P+K">P. K. Cook</a>, <a href="/search/cond-mat?searchtype=author&query=Kutsal%2C+M">M. Kutsal</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</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="1912.01255v1-abstract-short" style="display: inline;"> We present a multi-purpose mirror furnace designed for synchrotron X-ray experiments. The furnace is optimized specifically for dark-field X-ray microscopy (DFXM) of crystalline materials at the beamline ID06 of the ESRF. The furnace can reach up to ~1600掳C with stability better than 2掳C, and heating and cooling rates up to 30掳C/s. The contact-less design enables samples to be heated either in air… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.01255v1-abstract-full').style.display = 'inline'; document.getElementById('1912.01255v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.01255v1-abstract-full" style="display: none;"> We present a multi-purpose mirror furnace designed for synchrotron X-ray experiments. The furnace is optimized specifically for dark-field X-ray microscopy (DFXM) of crystalline materials at the beamline ID06 of the ESRF. The furnace can reach up to ~1600掳C with stability better than 2掳C, and heating and cooling rates up to 30掳C/s. The contact-less design enables samples to be heated either in air or in a controlled atmosphere in a capillary tube. The temperature was calibrated via the thermal expansion of an a-iron grain. Temperature profiles in the y and z axes were measured by scanning a thermocouple through the focal spot of the furnace. In the current configuration of the beamline, the furnace can be used for DFXM, near-field X-ray topography, bright field X-ray nanotomography, high resolution reciprocal space mapping, and limited powder diffraction experiments. As a first application, we present a DFXM case study on isothermal heating of a commercially pure Al single crystal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.01255v1-abstract-full').style.display = 'none'; document.getElementById('1912.01255v1-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 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.08805">arXiv:1609.08805</a> <span> [<a href="https://arxiv.org/pdf/1609.08805">pdf</a>, <a href="https://arxiv.org/format/1609.08805">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.95.014428">10.1103/PhysRevB.95.014428 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Field driven magnetostructural transitions in GeCo$_2$O$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fabr%C3%A8ges%2C+X">X. Fabr猫ges</a>, <a href="/search/cond-mat?searchtype=author&query=Ressouche%2C+E">E. Ressouche</a>, <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">F. Duc</a>, <a href="/search/cond-mat?searchtype=author&query=de+Brion%2C+S">S. de Brion</a>, <a href="/search/cond-mat?searchtype=author&query=Amara%2C+M">M. Amara</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Paolasini%2C+L">L. Paolasini</a>, <a href="/search/cond-mat?searchtype=author&query=Suard%2C+E">E. Suard</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+L+-">L. -P. Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Canals%2C+B">B. Canals</a>, <a href="/search/cond-mat?searchtype=author&query=Strobel%2C+P">P. Strobel</a>, <a href="/search/cond-mat?searchtype=author&query=Simonet%2C+V">V. Simonet</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1609.08805v2-abstract-short" style="display: inline;"> In the spinel compound GeCo$_2$O$_4$, the Co$^{2+}$ pyrochlore sublattice presents remarkable magnetic field-induced behaviors that we unveil through neutron and X-ray single-crystal diffraction. The N茅el ordered magnetic phase is entered through a structural lowering of the cubic symmetry. In this phase, when a magnetic field is applied along a 2-fold cubic direction, a spin-flop transition of on… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.08805v2-abstract-full').style.display = 'inline'; document.getElementById('1609.08805v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.08805v2-abstract-full" style="display: none;"> In the spinel compound GeCo$_2$O$_4$, the Co$^{2+}$ pyrochlore sublattice presents remarkable magnetic field-induced behaviors that we unveil through neutron and X-ray single-crystal diffraction. The N茅el ordered magnetic phase is entered through a structural lowering of the cubic symmetry. In this phase, when a magnetic field is applied along a 2-fold cubic direction, a spin-flop transition of one fourth of the magnetic moments releases the magnetic frustration and triggers magnetostructural effects. At high field, these ultimately lead to an unusual spin reorientation associated to structural changes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.08805v2-abstract-full').style.display = 'none'; document.getElementById('1609.08805v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 95, 014428 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1603.03588">arXiv:1603.03588</a> <span> [<a href="https://arxiv.org/pdf/1603.03588">pdf</a>, <a href="https://arxiv.org/format/1603.03588">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/10.1103/PhysRevB.94.064421">10.1103/PhysRevB.94.064421 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High Resolution Hard X-ray Magnetic Imaging with Dichroic Ptychography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Donnelly%2C+C">Claire Donnelly</a>, <a href="/search/cond-mat?searchtype=author&query=Scagnoli%2C+V">Valerio Scagnoli</a>, <a href="/search/cond-mat?searchtype=author&query=Guizar-Sicairos%2C+M">Manuel Guizar-Sicairos</a>, <a href="/search/cond-mat?searchtype=author&query=Holler%2C+M">Mirko Holler</a>, <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+F">Fabrice Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=Guillou%2C+F">Francois Guillou</a>, <a href="/search/cond-mat?searchtype=author&query=Rogalev%2C+A">Andrei Rogalev</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Menzel%2C+A">Andreas Menzel</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+J">Joerg Raabe</a>, <a href="/search/cond-mat?searchtype=author&query=Heyderman%2C+L+J">Laura J. Heyderman</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="1603.03588v3-abstract-short" style="display: inline;"> Imaging the magnetic structure of a material is essential to understanding the influence of the physical and chemical microstructure on its magnetic properties. Magnetic imaging techniques, however, have up to now been unable to probe 3D micrometer-sized systems with nanoscale resolution. Here we present the imaging of the magnetic domain configuration of a micrometre-thick FeGd multilayer with ha… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.03588v3-abstract-full').style.display = 'inline'; document.getElementById('1603.03588v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1603.03588v3-abstract-full" style="display: none;"> Imaging the magnetic structure of a material is essential to understanding the influence of the physical and chemical microstructure on its magnetic properties. Magnetic imaging techniques, however, have up to now been unable to probe 3D micrometer-sized systems with nanoscale resolution. Here we present the imaging of the magnetic domain configuration of a micrometre-thick FeGd multilayer with hard X-ray dichroic ptychography at energies spanning both the Gd L3 edge and the Fe K edge, providing a high spatial resolution spectroscopic analysis of the complex X-ray magnetic circular dichroism. With a spatial resolution reaching 45 nm, this advance in hard X-ray magnetic imaging is the first step towards the investigation of buried magnetic structures and extended three-dimensional magnetic systems at the nanoscale. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.03588v3-abstract-full').style.display = 'none'; document.getElementById('1603.03588v3-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 July, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 94, 064421 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1411.5617">arXiv:1411.5617</a> <span> [<a href="https://arxiv.org/pdf/1411.5617">pdf</a>, <a href="https://arxiv.org/format/1411.5617">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="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 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/10.1063/1.4914865">10.1063/1.4914865 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Crystallographic investigation of Au nanoparticles embedded in a SrTiO$_3$ thin film for plasmonics applications by means of synchrotron radiation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Pincini%2C+D">Davide Pincini</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Bernhardt%2C+H">Hendrik Bernhardt</a>, <a href="/search/cond-mat?searchtype=author&query=Katzer%2C+C">Christian Katzer</a>, <a href="/search/cond-mat?searchtype=author&query=Schimdl%2C+F">Frank Schimdl</a>, <a href="/search/cond-mat?searchtype=author&query=Uschmann%2C+I">Ingo Uschmann</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</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="1411.5617v1-abstract-short" style="display: inline;"> Self-organized monocrystalline Au nanoparticles with potential applications in plasmonics are grown in a SrTiO$_3$ matrix by a novel two-step deposition process. The crystalline preferred orientation of these Au nanoparticles is investigated by synchrotron hard x-ray diffraction. Nanoparticles preferentially align with the (111) direction along the substrate normal (001), whereas two in-plane orie… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.5617v1-abstract-full').style.display = 'inline'; document.getElementById('1411.5617v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1411.5617v1-abstract-full" style="display: none;"> Self-organized monocrystalline Au nanoparticles with potential applications in plasmonics are grown in a SrTiO$_3$ matrix by a novel two-step deposition process. The crystalline preferred orientation of these Au nanoparticles is investigated by synchrotron hard x-ray diffraction. Nanoparticles preferentially align with the (111) direction along the substrate normal (001), whereas two in-plane orientations are found with $[110]_{SrTiO_3} \: || \: [110]_{Au}$ and $[100]_{SrTiO_3} \: || \: [110]_{Au}$. Additionally, a smaller diffraction signal from nanoparticles with the (001) direction parallel to the substrate normal (001) is observed; once again, two in-plane orientations are found, with $[100]_{SrTiO_3} \: || \: [100]_{Au}$ and $[100]_{SrTiO_3} \: || \: [110]_{Au}$. The populations of the two in-plane orientations are found to depend on the thickness of the gold film deposited in the first step of the growth. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.5617v1-abstract-full').style.display = 'none'; document.getElementById('1411.5617v1-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 November, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">10 pages, 13 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Appl. Phys. 117, 105305 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1403.0722">arXiv:1403.0722</a> <span> [<a href="https://arxiv.org/pdf/1403.0722">pdf</a>, <a href="https://arxiv.org/format/1403.0722">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.4878915">10.1063/1.4878915 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A 31T split-pair pulsed magnet for single crystal x-ray diffraction at low temperature </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">F. Duc</a>, <a href="/search/cond-mat?searchtype=author&query=Fabr%C3%A8ges%2C+X">X. Fabr猫ges</a>, <a href="/search/cond-mat?searchtype=author&query=Roth%2C+T">T. Roth</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Frings%2C+P">P. Frings</a>, <a href="/search/cond-mat?searchtype=author&query=Nardone%2C+M">M. Nardone</a>, <a href="/search/cond-mat?searchtype=author&query=Billette%2C+J">J. Billette</a>, <a href="/search/cond-mat?searchtype=author&query=Lesourd%2C+M">M. Lesourd</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+L">L. Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Zitouni%2C+A">A. Zitouni</a>, <a href="/search/cond-mat?searchtype=author&query=Delescluse%2C+P">P. Delescluse</a>, <a href="/search/cond-mat?searchtype=author&query=B%C3%A9ard%2C+J">J. B茅ard</a>, <a href="/search/cond-mat?searchtype=author&query=Nicolin%2C+J+P">J. P. Nicolin</a>, <a href="/search/cond-mat?searchtype=author&query=Rikken%2C+G+L+J+A">G. L. J. A. Rikken</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="1403.0722v1-abstract-short" style="display: inline;"> We have developed a pulsed magnet system with panoramic access for synchrotron x-ray diffraction in magnetic fields up to 31T and at low temperature down to 1.5 K. The apparatus consists of a split-pair magnet, a liquid nitrogen bath to cool the pulsed coil, and a helium cryostat allowing sample temperatures from 1.5 up to 250 K. Using a 1.15MJ mobile generator, magnetic field pulses of 60 ms leng… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.0722v1-abstract-full').style.display = 'inline'; document.getElementById('1403.0722v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1403.0722v1-abstract-full" style="display: none;"> We have developed a pulsed magnet system with panoramic access for synchrotron x-ray diffraction in magnetic fields up to 31T and at low temperature down to 1.5 K. The apparatus consists of a split-pair magnet, a liquid nitrogen bath to cool the pulsed coil, and a helium cryostat allowing sample temperatures from 1.5 up to 250 K. Using a 1.15MJ mobile generator, magnetic field pulses of 60 ms length were generated in the magnet, with a rise time of 16.5 ms and a repetition rate of 2 pulses/hour at 31 T. The setup was validated for single crystal diffraction on the ESRF beamline ID06. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.0722v1-abstract-full').style.display = 'none'; document.getElementById('1403.0722v1-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 March, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Rev. Sci. Instrum. 85, 053905 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1306.5563">arXiv:1306.5563</a> <span> [<a href="https://arxiv.org/pdf/1306.5563">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/10.1088/0953-8984/25/36/362202">10.1088/0953-8984/25/36/362202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Melting of chiral order in terbium manganate (TbMnO3) observed with resonant x-ray Bragg diffraction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lovesey%2C+S+W">S W Lovesey</a>, <a href="/search/cond-mat?searchtype=author&query=Scagnoli%2C+V">V Scagnoli</a>, <a href="/search/cond-mat?searchtype=author&query=Garganourakis%2C+M">M Garganourakis</a>, <a href="/search/cond-mat?searchtype=author&query=Koohpayeh%2C+S+M">S M Koohpayeh</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Staub%2C+U">U Staub</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="1306.5563v2-abstract-short" style="display: inline;"> Resonant Bragg diffraction of soft, circularly polarized x-rays has been used to observe directly the temperature dependence of chiral-order melting in a motif of Mn ions in terbium manganate. The underlying mechanism uses the b-axis component of a cycloid, which vanishes outside the polar phase. Melting is witnessed by the first and second harmonics of a cycloid, and we explain why the observed t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.5563v2-abstract-full').style.display = 'inline'; document.getElementById('1306.5563v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1306.5563v2-abstract-full" style="display: none;"> Resonant Bragg diffraction of soft, circularly polarized x-rays has been used to observe directly the temperature dependence of chiral-order melting in a motif of Mn ions in terbium manganate. The underlying mechanism uses the b-axis component of a cycloid, which vanishes outside the polar phase. Melting is witnessed by the first and second harmonics of a cycloid, and we explain why the observed temperature dependence is different in the two harmonics. Our direct observation of melting is supported by a solid foundation of evidence, derived from extensive studies of the azimuthal-angle dependence of intensities with both linear and circular polarization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.5563v2-abstract-full').style.display = 'none'; document.getElementById('1306.5563v2-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 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 25 (2013) 362202 (8pp) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1306.5195">arXiv:1306.5195</a> <span> [<a href="https://arxiv.org/pdf/1306.5195">pdf</a>, <a href="https://arxiv.org/ps/1306.5195">ps</a>, <a href="https://arxiv.org/format/1306.5195">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/10.1103/PhysRevB.88.054413">10.1103/PhysRevB.88.054413 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic ordering in GdNi2B2C revisited by resonant x-ray scattering: evidence for the double-q model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Normile%2C+P+S">P. S. Normile</a>, <a href="/search/cond-mat?searchtype=author&query=Rotter%2C+M">M. Rotter</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Jensen%2C+J">J. Jensen</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=Blanco%2C+J+A">J. A. Blanco</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="1306.5195v1-abstract-short" style="display: inline;"> Recent theoretical efforts aimed at understanding the nature of antiferromagnetic ordering in GdNi2B2C predicted double-q ordering. Here we employ resonant elastic x-ray scattering to test this theory against the formerly proposed, single-q ordering scenario. Our study reveals a satellite reflection associated with a mixed-order component propagation wave vector, viz., (q_a,2q_b,0) with q_b = q_a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.5195v1-abstract-full').style.display = 'inline'; document.getElementById('1306.5195v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1306.5195v1-abstract-full" style="display: none;"> Recent theoretical efforts aimed at understanding the nature of antiferromagnetic ordering in GdNi2B2C predicted double-q ordering. Here we employ resonant elastic x-ray scattering to test this theory against the formerly proposed, single-q ordering scenario. Our study reveals a satellite reflection associated with a mixed-order component propagation wave vector, viz., (q_a,2q_b,0) with q_b = q_a approx= 0.55 reciprocal lattice units, the presence of which is incompatible with single-q ordering but is expected from the double-q model. A (3q_a,0,0) wave vector (i.e., third-order) satellite is also observed, again in line with the double-q model. The temperature dependencies of these along with that of a first-order satellite are compared with calculations based on the double-q model and reasonable qualitative agreement is found. By examining the azimuthal dependence of first-order satellite scattering, we show the magnetic order to be, as predicted, elliptically polarized at base temperature and find the temperature dependence of the "out of a-b plane" moment component to be in fairly good agreement with calculation. Our results provide qualitative support for the double-q model and thus in turn corroborate the explanation for the "magnetoelastic paradox" offered by this model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.5195v1-abstract-full').style.display = 'none'; document.getElementById('1306.5195v1-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 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures. Submitted to Phys. Rev. B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 88, 054413 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1211.3992">arXiv:1211.3992</a> <span> [<a href="https://arxiv.org/pdf/1211.3992">pdf</a>, <a href="https://arxiv.org/ps/1211.3992">ps</a>, <a href="https://arxiv.org/format/1211.3992">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.87.020404">10.1103/PhysRevB.87.020404 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-field irreversible moment reorientation in the antiferromagnet Fe$_{1.1}$Te </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Knafo%2C+W">W. Knafo</a>, <a href="/search/cond-mat?searchtype=author&query=Viennois%2C+R">R. Viennois</a>, <a href="/search/cond-mat?searchtype=author&query=Ballon%2C+G">G. Ballon</a>, <a href="/search/cond-mat?searchtype=author&query=Fabr%C3%A8ges%2C+X">X. Fabr猫ges</a>, <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">F. Duc</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=L%C3%A9otin%2C+J">J. L茅otin</a>, <a href="/search/cond-mat?searchtype=author&query=Giannini%2C+E">E. Giannini</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="1211.3992v3-abstract-short" style="display: inline;"> Magnetization measurements have been performed on single-crystalline Fe$_{1.1}$Te in pulsed magnetic fields $\mathbf{H}\perp\mathbf{c}$ up to 53 T and temperatures from 4.2 to 65 K. At $T=4.2$ K, a non-reversible reorientation of the antiferromagnetic moments is observed at $渭_0H_R=48$ T as the pulsed field is on the rise. No anomaly is observed at $H_R$ during the fall of the field and, as long a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.3992v3-abstract-full').style.display = 'inline'; document.getElementById('1211.3992v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1211.3992v3-abstract-full" style="display: none;"> Magnetization measurements have been performed on single-crystalline Fe$_{1.1}$Te in pulsed magnetic fields $\mathbf{H}\perp\mathbf{c}$ up to 53 T and temperatures from 4.2 to 65 K. At $T=4.2$ K, a non-reversible reorientation of the antiferromagnetic moments is observed at $渭_0H_R=48$ T as the pulsed field is on the rise. No anomaly is observed at $H_R$ during the fall of the field and, as long as the temperature is unchanged, during both rises and falls of additional field pulses. The transition at $H_R$ is reactivated if the sample is warmed up above the N茅el temperature $T_N\simeq60$ K and cooled down again. The magnetic field-temperature phase diagram of Fe$_{1.1}$Te in $\mathbf{H}\perp\mathbf{c}$ is also investigated. We present the temperature dependence of $H_R$, as well as that of the antiferromagnetic-to-paramagnetic borderline $H_c$ in temperatures above 40 K. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.3992v3-abstract-full').style.display = 'none'; document.getElementById('1211.3992v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 November, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 87, 020404(R) (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1106.4446">arXiv:1106.4446</a> <span> [<a href="https://arxiv.org/pdf/1106.4446">pdf</a>, <a href="https://arxiv.org/format/1106.4446">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="Optics">physics.optics</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/10.1140/epjst/e2012-01630-2">10.1140/epjst/e2012-01630-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> X-ray polarization: General formalism and polarization analysis </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=del+Rio%2C+M+S">M. Sanchez del Rio</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</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="1106.4446v1-abstract-short" style="display: inline;"> The polarization of x-rays plays an outstanding role in experimental techniques such as non-resonant magnetic x-ray scattering and resonant x-ray scattering of magnetic and multipolar order. Different instrumental methods applied to synchrotron light can transform its natural polarization into an arbitrary polarization state. Several synchrotron applications, in particular in the field of magnetic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.4446v1-abstract-full').style.display = 'inline'; document.getElementById('1106.4446v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1106.4446v1-abstract-full" style="display: none;"> The polarization of x-rays plays an outstanding role in experimental techniques such as non-resonant magnetic x-ray scattering and resonant x-ray scattering of magnetic and multipolar order. Different instrumental methods applied to synchrotron light can transform its natural polarization into an arbitrary polarization state. Several synchrotron applications, in particular in the field of magnetic and resonant scattering rely on the improvement in the signal/noise ratio or the deeper insight into the ordered state and the scattering process made possible through these polarization techniques. Here, we present the mathematical framework for the description of fully and partially polarized x-rays, with some applications such as linear x-ray polarization analysis for the determination of the scattered beam's polarization, and the Ge K-edge resonant scattering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.4446v1-abstract-full').style.display = 'none'; document.getElementById('1106.4446v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">12 pages, 6 figures and 1 table. To be published in proceedings of the workshop "Resonant Elastic X-ray Scattering", Aussois, France (2011)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. Special Topics 208, 359-371 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0809.1167">arXiv:0809.1167</a> <span> [<a href="https://arxiv.org/pdf/0809.1167">pdf</a>, <a href="https://arxiv.org/ps/0809.1167">ps</a>, <a href="https://arxiv.org/format/0809.1167">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.78.104407">10.1103/PhysRevB.78.104407 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Determination of magnetic order of the rare-earth ions in multiferroic TbMn2O5 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+R+D">R. D. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=Bland%2C+S+R">S. R. Bland</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Beale%2C+T+A+W">T. A. W. Beale</a>, <a href="/search/cond-mat?searchtype=author&query=Du%2C+C+H">C. H. Du</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</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=Hatton%2C+P+D">P. D. Hatton</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="0809.1167v1-abstract-short" style="display: inline;"> We have employed resonant x-ray magnetic scattering to specifically probe the magnetic order of the rare-earth ions in multiferroic $\mathrm{TbMn_2O_5}$. Two energy resonances were observed, one originated from the E1-E1 dipolar transition and the other from the E2-E2 quadrupolar transition. These resonances directly probe the valence 5d band and the partially occupied 4f band, respectively. Fir… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.1167v1-abstract-full').style.display = 'inline'; document.getElementById('0809.1167v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0809.1167v1-abstract-full" style="display: none;"> We have employed resonant x-ray magnetic scattering to specifically probe the magnetic order of the rare-earth ions in multiferroic $\mathrm{TbMn_2O_5}$. Two energy resonances were observed, one originated from the E1-E1 dipolar transition and the other from the E2-E2 quadrupolar transition. These resonances directly probe the valence 5d band and the partially occupied 4f band, respectively. First, full polarization analysis, which is a measurement of the scattered polarization as a function of incident polarization, confirmed a spin polarization of the terbium valence states (probed by the E1-E1 transition) by the $\mathrm{Mn^{4+}}$ spin density in the commensurate phase. Second, full polarization analysis data were collected in the low-temperature incommensurate and commensurate phases when tuned to the E2-E2 resonance. By employing a least-squares fitting procedure, the spin orientations of the terbium ion sublattice were refined. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.1167v1-abstract-full').style.display = 'none'; document.getElementById('0809.1167v1-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, 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">10 pages, 11 figures, accepted in Physical Review B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0711.2874">arXiv:0711.2874</a> <span> [<a href="https://arxiv.org/pdf/0711.2874">pdf</a>, <a href="https://arxiv.org/ps/0711.2874">ps</a>, <a href="https://arxiv.org/format/0711.2874">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.100.056405">10.1103/PhysRevLett.100.056405 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct observation of the high magnetic field effect on the Jahn-Teller state in TbVO4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Duc%2C+F">F. Duc</a>, <a href="/search/cond-mat?searchtype=author&query=Kazei%2C+Z+A">Z. A. Kazei</a>, <a href="/search/cond-mat?searchtype=author&query=Vanacken%2C+J">J. Vanacken</a>, <a href="/search/cond-mat?searchtype=author&query=Frings%2C+P">P. Frings</a>, <a href="/search/cond-mat?searchtype=author&query=Bras%2C+W">W. Bras</a>, <a href="/search/cond-mat?searchtype=author&query=Lorenzo%2C+J+E">J. E. Lorenzo</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=Rikken%2C+G+L+J+A">G. L. J. A. Rikken</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="0711.2874v1-abstract-short" style="display: inline;"> We report the first direct observation of the influence of high magnetic fields on the Jahn-Teller (JT) transition in TbVO4. Contrary to spectroscopic and magnetic methods, X-ray diffraction directly measures the JT distortion; the splitting between the (311)/(131) and (202)/(022) pairs of Bragg reflections is proportional to the order parameter. Our experimental results are compared to mean fie… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0711.2874v1-abstract-full').style.display = 'inline'; document.getElementById('0711.2874v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0711.2874v1-abstract-full" style="display: none;"> We report the first direct observation of the influence of high magnetic fields on the Jahn-Teller (JT) transition in TbVO4. Contrary to spectroscopic and magnetic methods, X-ray diffraction directly measures the JT distortion; the splitting between the (311)/(131) and (202)/(022) pairs of Bragg reflections is proportional to the order parameter. Our experimental results are compared to mean field calculations, taking into account all possible orientations of the grains relative to the applied field, and qualitative agreement is obtained. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0711.2874v1-abstract-full').style.display = 'none'; document.getElementById('0711.2874v1-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 November, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2007. </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, 4 figures, submitted to Phys. Rev. Lett</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0710.5507">arXiv:0710.5507</a> <span> [<a href="https://arxiv.org/pdf/0710.5507">pdf</a>, <a href="https://arxiv.org/ps/0710.5507">ps</a>, <a href="https://arxiv.org/format/0710.5507">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.76.134419">10.1103/PhysRevB.76.134419 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Influence of static Jahn-Teller distortion on the magnetic excitation spectrum of PrO2: A synchrotron x-ray and neutron inelastic scattering study </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Webster%2C+C+H">C. H. Webster</a>, <a href="/search/cond-mat?searchtype=author&query=Helme%2C+L+M">L. M. Helme</a>, <a href="/search/cond-mat?searchtype=author&query=Boothroyd%2C+A+T">A. T. Boothroyd</a>, <a href="/search/cond-mat?searchtype=author&query=McMorrow%2C+D+F">D. F. McMorrow</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=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+B">B. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Bewley%2C+R+I">R. I. Bewley</a>, <a href="/search/cond-mat?searchtype=author&query=McKelvy%2C+M+J">M. J. McKelvy</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="0710.5507v1-abstract-short" style="display: inline;"> A synchrotron x-ray diffraction study of the crystallographic structure of PrO2 in the Jahn-Teller distorted phase is reported. The distortion of the oxygen sublattice, which was previously ambiguous, is shown to be a chiral structure in which neighbouring oxygen chains have opposite chiralities. A temperature dependent study of the magnetic excitation spectrum, probed by neutron inelastic scatt… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.5507v1-abstract-full').style.display = 'inline'; document.getElementById('0710.5507v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0710.5507v1-abstract-full" style="display: none;"> A synchrotron x-ray diffraction study of the crystallographic structure of PrO2 in the Jahn-Teller distorted phase is reported. The distortion of the oxygen sublattice, which was previously ambiguous, is shown to be a chiral structure in which neighbouring oxygen chains have opposite chiralities. A temperature dependent study of the magnetic excitation spectrum, probed by neutron inelastic scattering, is also reported. Changes in the energies and relative intensities of the crystal field transitions provide an insight into the interplay between the static and dynamic Jahn-Teller effects. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.5507v1-abstract-full').style.display = 'none'; document.getElementById('0710.5507v1-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 October, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2007. </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> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 76, 134419 (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/0611239">arXiv:cond-mat/0611239</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0611239">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0611239">ps</a>, <a href="https://arxiv.org/format/cond-mat/0611239">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.76.195118">10.1103/PhysRevB.76.195118 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Disentangling multipole resonances through a full x-ray polarization analysis </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</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=Di+Matteo%2C+S">S. Di Matteo</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+B">B. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Scagnoli%2C+V">V. Scagnoli</a>, <a href="/search/cond-mat?searchtype=author&query=Paolasini%2C+L">L. Paolasini</a>, <a href="/search/cond-mat?searchtype=author&query=Ghigna%2C+P">P. Ghigna</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/0611239v3-abstract-short" style="display: inline;"> Complete polarization analysis applied to resonant x-ray scattering at the Cr K-edge in K2CrO4 shows that incident linearly polarized x-rays can be converted into circularly polarized x-rays by diffraction at the Cr pre-edge (E = 5994 eV). The physical mechanism behind this phenomenon is a subtle interference effect between purely dipole (E1-E1) and purely quadrupole (E2-E2) transitions, leading… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0611239v3-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0611239v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0611239v3-abstract-full" style="display: none;"> Complete polarization analysis applied to resonant x-ray scattering at the Cr K-edge in K2CrO4 shows that incident linearly polarized x-rays can be converted into circularly polarized x-rays by diffraction at the Cr pre-edge (E = 5994 eV). The physical mechanism behind this phenomenon is a subtle interference effect between purely dipole (E1-E1) and purely quadrupole (E2-E2) transitions, leading to a phase shift between the respective scattering amplitudes. This effect may be exploited to disentangle two close-lying resonances that appear as a single peak in a conventional energy scan, in this way allowing to single out and identify the different multipole order parameters involved. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0611239v3-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0611239v3-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 January, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 November, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2006. </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</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 76 (2007), 195118 </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/0508392">arXiv:cond-mat/0508392</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0508392">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0508392">ps</a>, <a href="https://arxiv.org/format/cond-mat/0508392">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.73.060406">10.1103/PhysRevB.73.060406 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct observation of electric-quadrupolar order in UO$_{2}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S+B">S. B. Wilkins</a>, <a href="/search/cond-mat?searchtype=author&query=Caciuffo%2C+R">R. Caciuffo</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Rebizant%2C+J">J. Rebizant</a>, <a href="/search/cond-mat?searchtype=author&query=Colineau%2C+E">E. Colineau</a>, <a href="/search/cond-mat?searchtype=author&query=Wastin%2C+F">F. Wastin</a>, <a href="/search/cond-mat?searchtype=author&query=Lander%2C+G+H">G. H. Lander</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0508392v1-abstract-short" style="display: inline;"> We report direct experimental evidence for long-range antiferro ordering of the electric-quadrupole moments on the U ions. Resonant x-ray scattering experiments at the uranium $M_{4}$ absorption edge show a characteristic dependence in the integrated intensity upon rotation of the crystal around the scattering vector. Although quadrupolar order in uranium dioxide was advocated already in the 196… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0508392v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0508392v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0508392v1-abstract-full" style="display: none;"> We report direct experimental evidence for long-range antiferro ordering of the electric-quadrupole moments on the U ions. Resonant x-ray scattering experiments at the uranium $M_{4}$ absorption edge show a characteristic dependence in the integrated intensity upon rotation of the crystal around the scattering vector. Although quadrupolar order in uranium dioxide was advocated already in the 1960s no experimental evidence for this phenomenon was provided until now. We conclude with a possible model to explain the phase diagram of the solid solutions of UO$_{2}$ and NpO$_{2}$. We suggest that in the region $0.30 < x < 0.75$ neither the transverse nor the longitudinal quadrupole ordering can dominate, leading to frustration and only short-range ordering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0508392v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0508392v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 August, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">11 Pages, 4 Figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 73, 060406(R) (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/0403535">arXiv:cond-mat/0403535</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0403535">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0403535">ps</a>, <a href="https://arxiv.org/format/cond-mat/0403535">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.70.214402">10.1103/PhysRevB.70.214402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Resonant X-ray Scattering Study of Magnetic and Electric-quadrupole Order in U$_{0.75}$Np$_{0.25}$O$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S+B">S. B. Wilkins</a>, <a href="/search/cond-mat?searchtype=author&query=Paxiao%2C+J+A">J. A. Paxiao</a>, <a href="/search/cond-mat?searchtype=author&query=Caciuffo%2C+R">R. Caciuffo</a>, <a href="/search/cond-mat?searchtype=author&query=Javorsky%2C+P">P. Javorsky</a>, <a href="/search/cond-mat?searchtype=author&query=Wastin%2C+F">F. Wastin</a>, <a href="/search/cond-mat?searchtype=author&query=Rebizant%2C+J">J. Rebizant</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Bernhoeft%2C+N">N. Bernhoeft</a>, <a href="/search/cond-mat?searchtype=author&query=Santini%2C+P">P. Santini</a>, <a href="/search/cond-mat?searchtype=author&query=Lander%2C+G+H">G. H. Lander</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0403535v1-abstract-short" style="display: inline;"> We have used element specific X-ray resonant scattering to investigate the M edge resonances in a single crystal of \unpo. Earlier neutron diffraction and M枚ssbauer studies had shown the presence of long-range AF order below T$_{N}$ = 19 K, with sizeable magnetic moment both on the U and the Np ions. RXS results confirm the presence of an ordered dipole magnetic moment on the Np ions, but also r… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0403535v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0403535v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0403535v1-abstract-full" style="display: none;"> We have used element specific X-ray resonant scattering to investigate the M edge resonances in a single crystal of \unpo. Earlier neutron diffraction and M枚ssbauer studies had shown the presence of long-range AF order below T$_{N}$ = 19 K, with sizeable magnetic moment both on the U and the Np ions. RXS results confirm the presence of an ordered dipole magnetic moment on the Np ions, but also reveal the presence of an anti-ferro arrangement of the electric quadrupole moments on both U and Np ions, with the same propagation vector that defines the magnetic structure. From the azimuthal dependence of the intensities we are able to determine the exact configuration of the quadrupolar ordering. The intensities of Bragg peaks associated with magnetic dipole and electric quadrupole order have different temperature dependences. On cooling below T$_{N}$, the magnetic dipole order develops faster on the uranium ions, with magnetic order on the Np ions increasing at a lower rate. At the same temperature, quadrupolar order on both the U and Np ions occurs along with an internal Jahn-Teller lattice distortion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0403535v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0403535v1-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 March, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2004. </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 Physical Review B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0309012">arXiv:cond-mat/0309012</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0309012">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0309012">ps</a>, <a href="https://arxiv.org/format/cond-mat/0309012">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Condensed Matter">cond-mat</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.69.174415">10.1103/PhysRevB.69.174415 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multi-$\vec{k}$ Configurations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bernhoeft%2C+N">N. Bernhoeft</a>, <a href="/search/cond-mat?searchtype=author&query=Paix%C3%A3o%2C+J+A">J. A. Paix茫o</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</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=Javorsky%2C+P">P. Javorsky</a>, <a href="/search/cond-mat?searchtype=author&query=Blackburn%2C+E">E. Blackburn</a>, <a href="/search/cond-mat?searchtype=author&query=Lander%2C+G+H">G. H. Lander</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0309012v1-abstract-short" style="display: inline;"> Using resonant x-ray scattering to perform diffraction experiments at the U M$_{4}$ edge novel reflections of the generic form $<kkk>$ have been observed in UAs$_{0.8}$Se$_{0.2}$ where $\vec{k} = < k00>$, with $k = {1/2}$ reciprocal lattice units, is the wave vector of the primary (magnetic) order parameter. The $<kkk>$ reflections, with $10^{-4}$ of the $<k00>$ magnetic intensities, cannot be e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0309012v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0309012v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0309012v1-abstract-full" style="display: none;"> Using resonant x-ray scattering to perform diffraction experiments at the U M$_{4}$ edge novel reflections of the generic form $<kkk>$ have been observed in UAs$_{0.8}$Se$_{0.2}$ where $\vec{k} = < k00>$, with $k = {1/2}$ reciprocal lattice units, is the wave vector of the primary (magnetic) order parameter. The $<kkk>$ reflections, with $10^{-4}$ of the $<k00>$ magnetic intensities, cannot be explained on the basis of the primary order parameter within standard scattering theory. A full experimental characterisation of these reflections is presented including their energy, azimuthal and temperature dependencies. On this basis we establish that the reflections most likely arise from the electric dipole operator involving transitions between the core 3d and partially filled $5f$ states. The temperature dependence couples the $<kkk>$ peak to the triple-$\vec{k}$ region of the phase diagram: Below $\sim 50$ K, where previous studies have suggested a transition to a double-$\vec{k}$ state, the intensity of the $<kkk>$ is dramatically reduced. Whilst we are unable to give a definite explanation of how these novel reflections appear, this paper concludes with a discussion of possible ideas for these reflections in terms of the coherent superposition of the 3 primary (magnetic) order parameters. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0309012v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0309012v1-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 August, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2003. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 69, 174415 (2004) </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/0306742">arXiv:cond-mat/0306742</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0306742">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0306742">ps</a>, <a href="https://arxiv.org/format/cond-mat/0306742">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"> Lock-in transitions in ErNi2B2C and TbNi2B2C </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+C">C. Song</a>, <a href="/search/cond-mat?searchtype=author&query=Brown%2C+S">S. Brown</a>, <a href="/search/cond-mat?searchtype=author&query=Thompson%2C+P">P. Thompson</a>, <a href="/search/cond-mat?searchtype=author&query=Kreyssig%2C+A">A. Kreyssig</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> </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/0306742v1-abstract-short" style="display: inline;"> High resolution x-ray magnetic scattering has been used to determine the variation with temperature of the magnetic modulation vector, tau, in ErNi2B2C and TbNi2B2C to study the interplay between the weakly ferromagnetic (WFM) phase and proposed lock-in transitions in these materials. At temperatures below the WFM transitions, the modulation wave vectors are within the resolution limit of the co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0306742v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0306742v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0306742v1-abstract-full" style="display: none;"> High resolution x-ray magnetic scattering has been used to determine the variation with temperature of the magnetic modulation vector, tau, in ErNi2B2C and TbNi2B2C to study the interplay between the weakly ferromagnetic (WFM) phase and proposed lock-in transitions in these materials. At temperatures below the WFM transitions, the modulation wave vectors are within the resolution limit of the commensurate values 11/20 and 6/11 for ErNi2B2C and TbNi2B2C, respectively. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0306742v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0306742v1-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 June, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2003. </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, including 4 figures. Submitted to Phys. Rev. B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0212535">arXiv:cond-mat/0212535</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0212535">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0212535">ps</a>, <a href="https://arxiv.org/format/cond-mat/0212535">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.67.132407">10.1103/PhysRevB.67.132407 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Lockin to Weak Ferromagnetism in TbNi2B2C and ErNi2B2C </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Walker%2C+M+B">M. B. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</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/0212535v1-abstract-short" style="display: inline;"> This article describes a model in which ferromagnetism necessarily accompanies a spin-density-wave lockin transition in the borocarbide structure provided the commensurate phase wave vector satisfies Q = (m/n)a* with m even and n odd. The results account for the magnetic properties of TbNi2B2C, and are also possibly relevant also for those of ErNi2B2C. </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0212535v1-abstract-full" style="display: none;"> This article describes a model in which ferromagnetism necessarily accompanies a spin-density-wave lockin transition in the borocarbide structure provided the commensurate phase wave vector satisfies Q = (m/n)a* with m even and n odd. The results account for the magnetic properties of TbNi2B2C, and are also possibly relevant also for those of ErNi2B2C. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0212535v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0212535v1-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 December, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2002. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0210234">arXiv:cond-mat/0210234</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0210234">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0210234">ps</a>, <a href="https://arxiv.org/format/cond-mat/0210234">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physb.2003.11.017">10.1016/j.physb.2003.11.017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Polarization analysis of K-edge resonant x-ray scattering of germanium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</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/0210234v2-abstract-short" style="display: inline;"> The polarization of K-edge resonant scattering at the space group ``forbidden'' (0 0 6) reflection of Ge was measured as function of the azimuthal angle, psi. The experimental results are compared to model calculations based on symmetry analysis of the resonant scattering tensors. </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0210234v2-abstract-full" style="display: none;"> The polarization of K-edge resonant scattering at the space group ``forbidden'' (0 0 6) reflection of Ge was measured as function of the azimuthal angle, psi. The experimental results are compared to model calculations based on symmetry analysis of the resonant scattering tensors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0210234v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0210234v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 May, 2003; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 October, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2002. </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. Submitted to Phys. Rev. B Rapid Communications V2: Updated after referee reports</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physica B 345, 45-48 (2004) </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/0205096">arXiv:cond-mat/0205096</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0205096">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0205096">ps</a>, <a href="https://arxiv.org/format/cond-mat/0205096">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.89.187202">10.1103/PhysRevLett.89.187202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Triple-q octupolar ordering in NpO_2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Paixao%2C+J+A">J. A. Paixao</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Longfield%2C+M+J">M. J. Longfield</a>, <a href="/search/cond-mat?searchtype=author&query=Caciuffo%2C+R">R. Caciuffo</a>, <a href="/search/cond-mat?searchtype=author&query=Santini%2C+P">P. Santini</a>, <a href="/search/cond-mat?searchtype=author&query=Bernhoeft%2C+N">N. Bernhoeft</a>, <a href="/search/cond-mat?searchtype=author&query=Rebizant%2C+J">J. Rebizant</a>, <a href="/search/cond-mat?searchtype=author&query=Lander%2C+G+H">G. H. Lander</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0205096v2-abstract-short" style="display: inline;"> We report the results of resonant X-ray scattering experiments performed at the Np M_4,5 edges in NpO_2. Below T_0 = 25 K, the development of long-range order of Np electric quadrupoles is revealed by the growth of superlattice Bragg peaks. The electronic transition is not accompanied by any measurable crystallographic distortion, either internal or external, so the symmetry of the system remain… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0205096v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0205096v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0205096v2-abstract-full" style="display: none;"> We report the results of resonant X-ray scattering experiments performed at the Np M_4,5 edges in NpO_2. Below T_0 = 25 K, the development of long-range order of Np electric quadrupoles is revealed by the growth of superlattice Bragg peaks. The electronic transition is not accompanied by any measurable crystallographic distortion, either internal or external, so the symmetry of the system remains cubic. The polarization and azimuthal dependence of the intensity of the resonant peaks is well reproduced assuming Templeton scattering from a triple-q longitudinal antiferroquadrupolar structure. Electric quadrupole order in NpO_2 could be driven by the ordering at T_0 of magnetic octupoles of Gamma_5 symmetry, splitting the Np ground state quartet and leading to a singlet ground state with zero dipole magnetic moment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0205096v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0205096v2-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 July, 2002; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 May, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2002. </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, submitted to Phys. Rev. Lett. v2: resubmitted after referee reports</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/0008108">arXiv:cond-mat/0008108</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0008108">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0008108">ps</a>, <a href="https://arxiv.org/format/cond-mat/0008108">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/10.1209/epl/i2001-00608-x">10.1209/epl/i2001-00608-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> X-Ray Scattering Evidence for Macroscopic Strong Pinning Centers in the Sliding CDW state of NbSe_3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Rideau%2C+D">D. Rideau</a>, <a href="/search/cond-mat?searchtype=author&query=Monceau%2C+P">P. Monceau</a>, <a href="/search/cond-mat?searchtype=author&query=Currat%2C+R">R. Currat</a>, <a href="/search/cond-mat?searchtype=author&query=Requardt%2C+H">H. Requardt</a>, <a href="/search/cond-mat?searchtype=author&query=Nad%2C+F">F. Nad</a>, <a href="/search/cond-mat?searchtype=author&query=Lorenzo%2C+J+E">J. E. Lorenzo</a>, <a href="/search/cond-mat?searchtype=author&query=Brazovskii%2C+S">S. Brazovskii</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">C. Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Grubel%2C+G">G. Grubel</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/0008108v1-abstract-short" style="display: inline;"> Using high-resolution X-ray scattering techniques, we measure the variation, q(x), of the position in reciprocal space of the CDW satellite, in the sliding state, along the length of NbSe_3 whiskers. We show that structural defects and intentionally X-ray radiation-damaged regions increase locally the CDW pinning force, and induce CDW phase distortions which are consistent with those observed ne… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0008108v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0008108v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0008108v1-abstract-full" style="display: none;"> Using high-resolution X-ray scattering techniques, we measure the variation, q(x), of the position in reciprocal space of the CDW satellite, in the sliding state, along the length of NbSe_3 whiskers. We show that structural defects and intentionally X-ray radiation-damaged regions increase locally the CDW pinning force, and induce CDW phase distortions which are consistent with those observed near contacts. Using the semi-microscopic model from Brazovskii describing the normal-condensed carrier conversion, with spatially varying parameters, we account for the experimental spatial dependence of the CDW phase gradient near both types of defects. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0008108v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0008108v1-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 August, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2000. </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/9911199">arXiv:cond-mat/9911199</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/9911199">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/9911199">ps</a>, <a href="https://arxiv.org/format/cond-mat/9911199">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Condensed Matter">cond-mat</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.62.R6073">10.1103/PhysRevB.62.R6073 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> 4f spin density in the reentrant ferromagnet SmMn2Ge2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=McCarthy%2C+J+E">Joanne E. McCarthy</a>, <a href="/search/cond-mat?searchtype=author&query=Duffy%2C+J+A">Jonathan A. Duffy</a>, <a href="/search/cond-mat?searchtype=author&query=Detlefs%2C+C">Carsten Detlefs</a>, <a href="/search/cond-mat?searchtype=author&query=Cooper%2C+M+J">Malcolm J. Cooper</a>, <a href="/search/cond-mat?searchtype=author&query=Canfield%2C+P">Paul 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="cond-mat/9911199v4-abstract-short" style="display: inline;"> The spin contribution to the magnetic moment in SmMn2Ge2 has been measured by magnetic Compton scattering in both the low and high temperature ferromagnetic phases. At low temperature, the Sm site is shown to possess a large 4f spin moment of 3.4 +/- 0.1 Bohr magnetons, aligned antiparallel to the total magnetic moment. At high temperature, the data show conclusively that ordered magnetic moment… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9911199v4-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/9911199v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/9911199v4-abstract-full" style="display: none;"> The spin contribution to the magnetic moment in SmMn2Ge2 has been measured by magnetic Compton scattering in both the low and high temperature ferromagnetic phases. At low temperature, the Sm site is shown to possess a large 4f spin moment of 3.4 +/- 0.1 Bohr magnetons, aligned antiparallel to the total magnetic moment. At high temperature, the data show conclusively that ordered magnetic moments are present on the samarium site. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9911199v4-abstract-full').style.display = 'none'; document.getElementById('cond-mat/9911199v4-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 June, 2000; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 November, 1999; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 1999. </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, 2 figures, transferred from PRL to PRB (Rapid Comm.)</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a 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