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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Mazzoli%2C+C&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Mazzoli%2C+C&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Mazzoli%2C+C&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.12887">arXiv:2411.12887</a> <span> [<a href="https://arxiv.org/pdf/2411.12887">pdf</a>, <a href="https://arxiv.org/format/2411.12887">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"> Investigation of magnetic excitations and charge order in a van der Waals ferromagnet Fe$_5$GeTe$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bhartiya%2C+V+K">V. K. Bhartiya</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+T">T. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">J. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Darlington%2C+T+P">T. P. Darlington</a>, <a href="/search/cond-mat?searchtype=author&query=Rizzo%2C+D+J">D. J. Rizzo</a>, <a href="/search/cond-mat?searchtype=author&query=Gu.%2C+Y">Y. Gu.</a>, <a href="/search/cond-mat?searchtype=author&query=Fan%2C+S">S. Fan</a>, <a href="/search/cond-mat?searchtype=author&query=Nelson%2C+C">C. Nelson</a>, <a href="/search/cond-mat?searchtype=author&query=Freeland%2C+J+W">J. W. Freeland</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+X">X. Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Basov%2C+D+N">D. N. Basov</a>, <a href="/search/cond-mat?searchtype=author&query=Pelliciari%2C+J">J. Pelliciari</a>, <a href="/search/cond-mat?searchtype=author&query=May%2C+A+F">A. F. May</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Bisogni%2C+V">V. Bisogni</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="2411.12887v2-abstract-short" style="display: inline;"> Understanding the complex ground state of van der Waals (vdW) magnets is essential for designing new materials and devices that leverage these platforms. Here, we investigate a two-dimensional vdW ferromagnet -- Fe$_5$GeTe$_2$-- with one of the highest reported Curie temperatures, to elucidate its magnetic excitations and charge order. Using Fe $L_3 - $edge resonant inelastic x-ray scattering, we… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.12887v2-abstract-full').style.display = 'inline'; document.getElementById('2411.12887v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.12887v2-abstract-full" style="display: none;"> Understanding the complex ground state of van der Waals (vdW) magnets is essential for designing new materials and devices that leverage these platforms. Here, we investigate a two-dimensional vdW ferromagnet -- Fe$_5$GeTe$_2$-- with one of the highest reported Curie temperatures, to elucidate its magnetic excitations and charge order. Using Fe $L_3 - $edge resonant inelastic x-ray scattering, we find the dual character of magnetic excitations, consisting of a coherent magnon and a continuum, similar to what is reported for its sister compound Fe$_3$GeTe$_2$. The magnon has an energy of $\approx$ 36 meV at the maximum in-plane momentum transfer ($-$0.35 r.l.u.) allowed at Fe $L_3 - $edge. A broad and non-dispersive continuum extends up to 150 meV, 50$\%$ higher energy than in Fe$_3$GeTe$_2$. Its intensity is sinusoidally modulated along the $L$ direction, with a period matching the inter-slab distance. Our findings suggest that while the unconventional dual character of magnetic excitations is generic to ternary Fe-Ge-Te vdW magnets, the correlation length of the out-of-plane magnetic interaction increases in Fe$_5$GeTe$_2$ as compared to Fe$_3$GeTe$_2$, supporting a stronger three-dimensional character for the former. Furthermore, by investigating the $\pm$(1/3, 1/3, $L$) peaks by resonant x-ray diffraction, we conclude these to have structural origin rather than charge order -- as previously reported -- and suggest doubling of the structural unit cell along the $c-$axis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.12887v2-abstract-full').style.display = 'none'; document.getElementById('2411.12887v2-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.18258">arXiv:2409.18258</a> <span> [<a href="https://arxiv.org/pdf/2409.18258">pdf</a>, <a href="https://arxiv.org/format/2409.18258">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.133.206501">10.1103/PhysRevLett.133.206501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Capping effects on spin and charge excitations in parent and superconducting Nd1-xSrxNiO2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fan%2C+S">S. Fan</a>, <a href="/search/cond-mat?searchtype=author&query=LaBollita%2C+H">H. LaBollita</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+Q">Q. Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Khan%2C+N">N. Khan</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+Y">Y. Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+T">T. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">J. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Bhartiya%2C+V">V. Bhartiya</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Y. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+W">W. Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+J">J. Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+S">S. Yan</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A">A. Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+X">X. Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Cano%2C+A">A. Cano</a>, <a href="/search/cond-mat?searchtype=author&query=Bernardini%2C+F">F. Bernardini</a>, <a href="/search/cond-mat?searchtype=author&query=Nie%2C+Y">Y. Nie</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+Z">Z. Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Bisogni%2C+V">V. Bisogni</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Botana%2C+A+S">A. S. Botana</a>, <a href="/search/cond-mat?searchtype=author&query=Pelliciari%2C+J">J. Pelliciari</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="2409.18258v1-abstract-short" style="display: inline;"> Superconductivity in infinite layer nickelates Nd1-xSrxNiO2 has so far been achieved only in thin films raising questions on the role of substrates and interfaces. Given the challenges associated with their synthesis it is imperative to identify their intrinsic properties. We use Resonant Inelastic X-ray Scattering (RIXS) to investigate the influence of the SrTiO3 capping layer on the excitations… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.18258v1-abstract-full').style.display = 'inline'; document.getElementById('2409.18258v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.18258v1-abstract-full" style="display: none;"> Superconductivity in infinite layer nickelates Nd1-xSrxNiO2 has so far been achieved only in thin films raising questions on the role of substrates and interfaces. Given the challenges associated with their synthesis it is imperative to identify their intrinsic properties. We use Resonant Inelastic X-ray Scattering (RIXS) to investigate the influence of the SrTiO3 capping layer on the excitations of Nd1-xSrxNiO2 (x = 0 and 0.2). Spin excitations are observed in parent and 20% doped Nd1-xSrxNiO2 regardless of capping, proving that magnetism is intrinsic to infinite-layer nickelates and appears in a significant fraction of their phase diagram. In parent and superconducting Nd1-xSrxNiO2, the spin excitations are slightly hardened in capped samples compared to the non-capped ones. Additionally, a weaker Ni - Nd charge transfer peak at ~ 0.6 eV suggests that the hybridization between Ni 3d and Nd 5d orbitals is reduced in capped samples. From our data, capping induces only minimal differences in Nd1-xSrxNiO2 and we phenomenologically discuss these differences based on the reconstruction of the SrTiO3 - NdNiO2 interface and other mechanisms such as crystalline disorder. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.18258v1-abstract-full').style.display = 'none'; document.getElementById('2409.18258v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters, 2024 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.15086">arXiv:2306.15086</a> <span> [<a href="https://arxiv.org/pdf/2306.15086">pdf</a>, <a href="https://arxiv.org/format/2306.15086">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Comment on newly found Charge Density Waves in infinite layer Nickelates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Pelliciari%2C+J">J. Pelliciari</a>, <a href="/search/cond-mat?searchtype=author&query=Khan%2C+N">N. Khan</a>, <a href="/search/cond-mat?searchtype=author&query=Wasik%2C+P">P. Wasik</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A">A. Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Y. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Nie%2C+Y">Y. Nie</a>, <a href="/search/cond-mat?searchtype=author&query=Tranquada%2C+J+M">J. M. Tranquada</a>, <a href="/search/cond-mat?searchtype=author&query=Bisogni%2C+V">V. Bisogni</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="2306.15086v1-abstract-short" style="display: inline;"> Recent works[1-3] reported evidence for charge density waves (CDWs) in infinite layer nickelates (112 structure) based on resonant diffraction at the Ni $L_3$ edge measured at fixed scattering angle. We have found that a measurement with fixed momentum transfer, rather than scattering angle, does not show a resonance effect. We have also observed that a nearby structural Bragg peak from the substr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.15086v1-abstract-full').style.display = 'inline'; document.getElementById('2306.15086v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.15086v1-abstract-full" style="display: none;"> Recent works[1-3] reported evidence for charge density waves (CDWs) in infinite layer nickelates (112 structure) based on resonant diffraction at the Ni $L_3$ edge measured at fixed scattering angle. We have found that a measurement with fixed momentum transfer, rather than scattering angle, does not show a resonance effect. We have also observed that a nearby structural Bragg peak from the substrate appears due to third harmonic content of the incident beam, and spreads intensity down to the region of the attributed CDW order. This was further confirmed by testing a bare substrate. We suggest procedures to confirm an effective resonant enhancement of a diffraction peak. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.15086v1-abstract-full').style.display = 'none'; document.getElementById('2306.15086v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 June, 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/2204.14209">arXiv:2204.14209</a> <span> [<a href="https://arxiv.org/pdf/2204.14209">pdf</a>, <a href="https://arxiv.org/format/2204.14209">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="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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s42005-022-00934-y">10.1038/s42005-022-00934-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Site-specific electronic and magnetic excitations of the skyrmion material Cu$_2$OSeO$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gu%2C+Y">Yanhong Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yilin Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Lin%2C+J">Jiaqi Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Pelliciari%2C+J">Jonathan Pelliciari</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">Jiemin Li</a>, <a href="/search/cond-mat?searchtype=author&query=Han%2C+M">Myung-Geun Han</a>, <a href="/search/cond-mat?searchtype=author&query=Schmidt%2C+M+P">Marcus Peter Schmidt</a>, <a href="/search/cond-mat?searchtype=author&query=Kotliar%2C+G">Gabriel Kotliar</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+M+P+M">Mark P. M. Dean</a>, <a href="/search/cond-mat?searchtype=author&query=Bisogni%2C+V">Valentina Bisogni</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="2204.14209v1-abstract-short" style="display: inline;"> The manifestation of skyrmions in the Mott-insulator Cu$_2$OSeO$_3$ originates from a delicate balance between magnetic and electronic energy scales. As a result of these intertwined couplings, the two symmetry-inequivalent magnetic ions, Cu-I and Cu-II, bond into a spin S=1 entangled tetrahedron. However, conceptualizing the unconventional properties of this material and the energy of the competi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.14209v1-abstract-full').style.display = 'inline'; document.getElementById('2204.14209v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2204.14209v1-abstract-full" style="display: none;"> The manifestation of skyrmions in the Mott-insulator Cu$_2$OSeO$_3$ originates from a delicate balance between magnetic and electronic energy scales. As a result of these intertwined couplings, the two symmetry-inequivalent magnetic ions, Cu-I and Cu-II, bond into a spin S=1 entangled tetrahedron. However, conceptualizing the unconventional properties of this material and the energy of the competing interactions is a challenging task due the complexity of this system. Here we combine X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering to uncover the electronic and magnetic excitations of Cu$_2$OSeO$_3$ with site-specificity. We quantify the energies of the 3d crystal-field splitting for both Cu-I and Cu-II, fundamental to optimize model Hamiltonians. Additionally, we unveil a site-specific magnetic mode, indicating that individual spin character is preserved within the entangled-tetrahedron picture. Our results thus provide experimental constraint for validating theories that describe the interactions of Cu$_2$OSeO$_3$, highlighting the site-selective capabilities of resonant spectroscopies <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.14209v1-abstract-full').style.display = 'none'; document.getElementById('2204.14209v1-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 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Communications Physics volume 5, Article number: 156 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.02567">arXiv:2201.02567</a> <span> [<a href="https://arxiv.org/pdf/2201.02567">pdf</a>, <a href="https://arxiv.org/format/2201.02567">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.129.207201">10.1103/PhysRevLett.129.207201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Emergence of spinons in layered trimer iridate Ba4Ir3O10 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Y">Y. Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Sears%2C+J">J. Sears</a>, <a href="/search/cond-mat?searchtype=author&query=Fabbris%2C+G">G. Fabbris</a>, <a href="/search/cond-mat?searchtype=author&query=Weichselbaum%2C+A">A. Weichselbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Yin%2C+W">W. Yin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+H">H. Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzone%2C+D+G">D. G. Mazzone</a>, <a href="/search/cond-mat?searchtype=author&query=Miao%2C+H">H. Miao</a>, <a href="/search/cond-mat?searchtype=author&query=Upton%2C+M+.+H">M . H. Upton</a>, <a href="/search/cond-mat?searchtype=author&query=Casa%2C+D">D. Casa</a>, <a href="/search/cond-mat?searchtype=author&query=Acevedo-Esteves%2C+R">R. Acevedo-Esteves</a>, <a href="/search/cond-mat?searchtype=author&query=Nelson%2C+C">C. Nelson</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A+M">A. M. Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+G">G. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+M+P+M">M. P. M. Dean</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.02567v2-abstract-short" style="display: inline;"> Spinons are well-known as the elementary excitations of one-dimensional antiferromagnetic chains, but means to realize spinons in higher dimensions is the subject of intense research. Here, we use resonant x-ray scattering to study the layered trimer iridate Ba4Ir3O10, which shows no magnetic order down to 0.2 K. An emergent one-dimensional spinon continuum is observed that can be well-described b… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.02567v2-abstract-full').style.display = 'inline'; document.getElementById('2201.02567v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.02567v2-abstract-full" style="display: none;"> Spinons are well-known as the elementary excitations of one-dimensional antiferromagnetic chains, but means to realize spinons in higher dimensions is the subject of intense research. Here, we use resonant x-ray scattering to study the layered trimer iridate Ba4Ir3O10, which shows no magnetic order down to 0.2 K. An emergent one-dimensional spinon continuum is observed that can be well-described by XXZ spin-1/2 chains with magnetic exchange of ~55 meV and a small Ising-like anisotropy. With 2% isovalent Sr doping, magnetic order appears below TN=130 K along with sharper excitations, indicating that the spinons become more confined in (Ba1-xSrx)4Ir3O10. We propose that the frustrated intra-trimer interactions effectively reduce the system into decoupled spin chains, the subtle balance of which can be easily tipped by perturbations such as chemical doping. Our results put Ba4Ir3O10 between the one-dimensional chain and two-dimensional quantum spin liquid scenarios, illustrating a new way to suppress magnetic order and realize fractional spinons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.02567v2-abstract-full').style.display = 'none'; document.getElementById('2201.02567v2-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, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">Accepted in Physical Review Letters; 5 pages not including references or supplementary</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.04790">arXiv:2110.04790</a> <span> [<a href="https://arxiv.org/pdf/2110.04790">pdf</a>, <a href="https://arxiv.org/format/2110.04790">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="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/10.1103/PhysRevB.105.214425">10.1103/PhysRevB.105.214425 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photon correlation spectroscopy with heterodyne mixing based on soft-x-ray magnetic circular dichroism </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Klose%2C+C">Christopher Klose</a>, <a href="/search/cond-mat?searchtype=author&query=B%C3%BCttner%2C+F">Felix B眉ttner</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">Wen Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Beach%2C+G+S+D">Geoffrey S. D. Beach</a>, <a href="/search/cond-mat?searchtype=author&query=Eisebitt%2C+S">Stefan Eisebitt</a>, <a href="/search/cond-mat?searchtype=author&query=Pfau%2C+B">Bastian Pfau</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="2110.04790v2-abstract-short" style="display: inline;"> Many magnetic equilibrium states and phase transitions are characterized by fluctuations. Such magnetic fluctuation can in principle be detected with scattering-based x-ray photon correlation spectroscopy (XPCS). However, in the established approach of XPCS, the magnetic scattering signal is quadratic in the magnetic scattering cross section, which results not only in often prohibitively small sig… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.04790v2-abstract-full').style.display = 'inline'; document.getElementById('2110.04790v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.04790v2-abstract-full" style="display: none;"> Many magnetic equilibrium states and phase transitions are characterized by fluctuations. Such magnetic fluctuation can in principle be detected with scattering-based x-ray photon correlation spectroscopy (XPCS). However, in the established approach of XPCS, the magnetic scattering signal is quadratic in the magnetic scattering cross section, which results not only in often prohibitively small signals but also in a fundamental inability to detect negative correlations (anticorrelations). Here, we propose to exploit the possibility of heterodyne mixing of the magnetic signal with static charge scattering to reconstruct the first-order (linear) magnetic correlation function. We show that the first-order magnetic scattering signal reconstructed from heterodyne scattering now directly represents the underlying magnetization texture. Moreover, we suggest a practical implementation based on an absorption mask rigidly connected to the sample, which not only produces a static charge scattering signal but also eliminates the problem of drift-induced artificial decay of the correlation functions. Our method thereby significantly broadens the range of scientific questions accessible by magnetic x-ray photon correlation spectroscopy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.04790v2-abstract-full').style.display = 'none'; document.getElementById('2110.04790v2-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 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.00082">arXiv:2104.00082</a> <span> [<a href="https://arxiv.org/pdf/2104.00082">pdf</a>, <a href="https://arxiv.org/format/2104.00082">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.126.177601">10.1103/PhysRevLett.126.177601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charge Condensation and Lattice Coupling Drives Stripe Formation in Nickelates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Y">Y. Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Fabbris%2C+G">G. Fabbris</a>, <a href="/search/cond-mat?searchtype=author&query=Miao%2C+H">H. Miao</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+Y">Y. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Meyers%2C+D">D. Meyers</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzone%2C+D+G">D. G. Mazzone</a>, <a href="/search/cond-mat?searchtype=author&query=Assefa%2C+T">T. Assefa</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X+M">X. M. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Kisslinger%2C+K">K. Kisslinger</a>, <a href="/search/cond-mat?searchtype=author&query=Prabhakaran%2C+D">D. Prabhakaran</a>, <a href="/search/cond-mat?searchtype=author&query=Boothroyd%2C+A+T">A. T. Boothroyd</a>, <a href="/search/cond-mat?searchtype=author&query=Tranquada%2C+J+M">J. M. Tranquada</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">W. Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A+M">A. M. Barbour</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=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Robinson%2C+I+K">I. K. Robinson</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+M+P+M">M. P. M. Dean</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.00082v1-abstract-short" style="display: inline;"> Revealing the predominant driving force behind symmetry breaking in correlated materials is sometimes a formidable task due to the intertwined nature of different degrees of freedom. This is the case for La2-xSrxNiO4+未 in which coupled incommensurate charge and spin stripes form at low temperatures. Here, we use resonant X-ray photon correlation spectroscopy to study the temporal stability and dom… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.00082v1-abstract-full').style.display = 'inline'; document.getElementById('2104.00082v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.00082v1-abstract-full" style="display: none;"> Revealing the predominant driving force behind symmetry breaking in correlated materials is sometimes a formidable task due to the intertwined nature of different degrees of freedom. This is the case for La2-xSrxNiO4+未 in which coupled incommensurate charge and spin stripes form at low temperatures. Here, we use resonant X-ray photon correlation spectroscopy to study the temporal stability and domain memory of the charge and spin stripes in La2-xSrxNiO4+未. Although spin stripes are more spatially correlated, charge stripes maintain a better temporal stability against temperature change. More intriguingly, charge order shows robust domain memory with thermal cycling up to 250 K, far above the ordering temperature. These results demonstrate the pinning of charge stripes to the lattice and that charge condensation is the predominant factor in the formation of stripe orders in nickelates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.00082v1-abstract-full').style.display = 'none'; document.getElementById('2104.00082v1-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 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">7 pages; accepted in Physical Review Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 126, 177601 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.10148">arXiv:2011.10148</a> <span> [<a href="https://arxiv.org/pdf/2011.10148">pdf</a>, <a href="https://arxiv.org/format/2011.10148">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> </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.126.117201">10.1103/PhysRevLett.126.117201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Switchable X-ray Orbital Angular Momentum from an Artificial Spin Ice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Woods%2C+J">Justin Woods</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X+M">Xiaoqian M Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Chopdekar%2C+R+V">Rajesh V. Chopdekar</a>, <a href="/search/cond-mat?searchtype=author&query=Farmer%2C+B">Barry Farmer</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Koch%2C+R">Roland Koch</a>, <a href="/search/cond-mat?searchtype=author&query=Tremsin%2C+A">Anton Tremsin</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">Wen Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Scholl%2C+A">Andreas Scholl</a>, <a href="/search/cond-mat?searchtype=author&query=Kevan%2C+S">Steve Kevan</a>, <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S">Stuart Wilkins</a>, <a href="/search/cond-mat?searchtype=author&query=Kwok%2C+W">Wai-Kwong Kwok</a>, <a href="/search/cond-mat?searchtype=author&query=De+Long%2C+L+E">Lance E. De Long</a>, <a href="/search/cond-mat?searchtype=author&query=Roy%2C+S">Sujoy Roy</a>, <a href="/search/cond-mat?searchtype=author&query=Hastings%2C+J+T">J. Todd Hastings</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="2011.10148v1-abstract-short" style="display: inline;"> Artificial spin ices (ASI) have been widely investigated as magnetic metamaterials with exotic properties governed by their geometries. In parallel, interest in X-ray photon orbital angular momentum (OAM) has been rapidly growing. Here we show that a square ASI with a programmed topological defect, a double edge dislocation, imparts OAM to scattered X-rays. Unlike single dislocations, a double dis… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.10148v1-abstract-full').style.display = 'inline'; document.getElementById('2011.10148v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.10148v1-abstract-full" style="display: none;"> Artificial spin ices (ASI) have been widely investigated as magnetic metamaterials with exotic properties governed by their geometries. In parallel, interest in X-ray photon orbital angular momentum (OAM) has been rapidly growing. Here we show that a square ASI with a programmed topological defect, a double edge dislocation, imparts OAM to scattered X-rays. Unlike single dislocations, a double dislocation does not introduce magnetic frustration, and the ASI equilibrates to its antiferromagnetic (AF) ground state. The topological charge of the defect differs with respect to the structural and magnetic order; thus, X-ray diffraction from the ASI produces photons with even and odd OAM quantum numbers at the structural and AF Bragg conditions, respectively. The magnetic transitions of the ASI allow the AF OAM beams to be switched on and off by modest variations of temperature and applied magnetic field. These results demonstrate ASIs can serve as metasurfaces for reconfigurable X-ray optics that could enable selective probes of electronic and magnetic properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.10148v1-abstract-full').style.display = 'none'; document.getElementById('2011.10148v1-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, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 126, 117201 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.13668">arXiv:2007.13668</a> <span> [<a href="https://arxiv.org/pdf/2007.13668">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevMaterials.4.114007">10.1103/PhysRevMaterials.4.114007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spatially correlated incommensurate lattice modulations in an atomically thin high-temperature Bi_{2.1}Sr_{1.9}CaCu_{2.0}O_{8+未} superconductors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Poccia%2C+N">Nicola Poccia</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+S+Y+F">Shu Yang Frank Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Yoo%2C+H">Hyobin Yoo</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+X">Xiaojing Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+H">Hanfei Yan</a>, <a href="/search/cond-mat?searchtype=author&query=Chu%2C+Y+S">Yong S. Chu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+R">Ruidan Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+G">Genda Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Campi%2C+G">Gaetano Campi</a>, <a href="/search/cond-mat?searchtype=author&query=Vinokur%2C+V+M">Valerii M. Vinokur</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+P">Philip Kim</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2007.13668v2-abstract-short" style="display: inline;"> Strong variations in superconducting critical temperatures in different families of the cuprate perovskites, even with similar hole doping in their copper-oxygen planes, suggest the importance of lattice modulation effects. The one-dimensional incommensurate lattice modulation (ILM) of Bi_2Sr_2CaCu_2O_{8+y}, with the average atomic positions perturbed beyond the unit cell, offers an ideal test gro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.13668v2-abstract-full').style.display = 'inline'; document.getElementById('2007.13668v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.13668v2-abstract-full" style="display: none;"> Strong variations in superconducting critical temperatures in different families of the cuprate perovskites, even with similar hole doping in their copper-oxygen planes, suggest the importance of lattice modulation effects. The one-dimensional incommensurate lattice modulation (ILM) of Bi_2Sr_2CaCu_2O_{8+y}, with the average atomic positions perturbed beyond the unit cell, offers an ideal test ground for studying the interplay between superconductivity and the long-range incommensurate lattice fluctuations. Here we report Scanning nano X-ray Diffraction (SnXRD) imaging of incommensurate lattice modulations in Bi_{2.1}Sr_{1.9}CaCu_{2.0}O_{8+未} Van der Waals heterostructures of thicknesses down to two-unit cells. Using SnXRD, we probe that the long-range and short-range incommensurate lattice modulations in bulk sample surface with spatial resolution below 100 nm. We find that puddle-like domains of ILM of size uniformly evolving with dimensionality. In the 2-unit cell thin sample, it is observed that the wavevectors of the long- and short-range orders become anti-correlated with emerging spatial patterns having a directional gradient. The emerging patterns, originated by tiny tuning of lattice strain, induce static mesoscopic charge density waves. Our findings thus demonstrate that the strain can be used to tune and control the electromagnetic properties of two-dimensional high-temperature superconductors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.13668v2-abstract-full').style.display = 'none'; document.getElementById('2007.13668v2-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, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 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> Phys. Rev. Materials 4, 114007 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.01239">arXiv:2006.01239</a> <span> [<a href="https://arxiv.org/pdf/2006.01239">pdf</a>, <a href="https://arxiv.org/format/2006.01239">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.103.L060401">10.1103/PhysRevB.103.L060401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for the Alternating Next-Nearest Neighbor model in the dynamic behavior of a frustrated antiferromagnet </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Carr%2C+A">Adra Carr</a>, <a href="/search/cond-mat?searchtype=author&query=Bowlan%2C+J">John Bowlan</a>, <a href="/search/cond-mat?searchtype=author&query=3"> 3</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A">Andi Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">Wen Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S">Stuart Wilkins</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+C">Colby Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xiaxin Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+J+H">Jong Hyuk Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+N">Nara Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Choi%2C+Y+J">Young Jai Choi</a>, <a href="/search/cond-mat?searchtype=author&query=Lin%2C+S">Shi-Zeng Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Sandberg%2C+R+L">Richard L. Sandberg</a>, <a href="/search/cond-mat?searchtype=author&query=Zapf%2C+V+S">Vivien S. Zapf</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.01239v1-abstract-short" style="display: inline;"> X-ray photon correlation spectroscopy (XPCS) enables us to study dynamics of antiferromagnets. Using coherent soft X-ray diffraction, we resonantly probe Mn and Co Bragg peaks in the frustrated magnetic chain compound Lu2CoMnO6 significantly below the Neel temperature. Bragg peaks of incommensurate order slide towards commensurate 'up up down down' order with decreasing temperature. Antiferromagne… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.01239v1-abstract-full').style.display = 'inline'; document.getElementById('2006.01239v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.01239v1-abstract-full" style="display: none;"> X-ray photon correlation spectroscopy (XPCS) enables us to study dynamics of antiferromagnets. Using coherent soft X-ray diffraction, we resonantly probe Mn and Co Bragg peaks in the frustrated magnetic chain compound Lu2CoMnO6 significantly below the Neel temperature. Bragg peaks of incommensurate order slide towards commensurate 'up up down down' order with decreasing temperature. Antiferromagnetic inhomogeneities produce speckle within the Bragg peaks, whose dynamics are probed by XPCS and compared to the classic Axial Next-Nearest Neighbor Interaction model of frustration. The data supports a novel model prediction: with decreasing temperature the dynamics become faster. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.01239v1-abstract-full').style.display = 'none'; document.getElementById('2006.01239v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 103, 060401 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.04259">arXiv:2002.04259</a> <span> [<a href="https://arxiv.org/pdf/2002.04259">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> </div> </div> <p class="title is-5 mathjax"> Direct measurement of temporal correlations above the spin-glass transition by coherent resonant magnetic x-ray spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+J">Jingjin Song</a>, <a href="/search/cond-mat?searchtype=author&query=Patel%2C+S+K+K">Sheena K. K. Patel</a>, <a href="/search/cond-mat?searchtype=author&query=Bhattacharya%2C+R">Rupak Bhattacharya</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+Y">Yi Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Pandey%2C+S">Sudip Pandey</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X+M">Xiao M. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Maple%2C+M+B">M. Brian Maple</a>, <a href="/search/cond-mat?searchtype=author&query=Fullerton%2C+E+E">Eric E. Fullerton</a>, <a href="/search/cond-mat?searchtype=author&query=Roy%2C+S">Sujoy Roy</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Varma%2C+C+M">Chandra M. Varma</a>, <a href="/search/cond-mat?searchtype=author&query=Sinha%2C+S+K">Sunil K. Sinha</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.04259v1-abstract-short" style="display: inline;"> In the 1970s a new paradigm was introduced that interacting quenched systems, such as a spin-glass, have a phase transition in which long time memory of spatial patterns is realized without spatial correlations. The principal methods to study the spin-glass transition, besides some elaborate and elegant theoretical constructions, have been numerical computer simulations and neutron spin echo measu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.04259v1-abstract-full').style.display = 'inline'; document.getElementById('2002.04259v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.04259v1-abstract-full" style="display: none;"> In the 1970s a new paradigm was introduced that interacting quenched systems, such as a spin-glass, have a phase transition in which long time memory of spatial patterns is realized without spatial correlations. The principal methods to study the spin-glass transition, besides some elaborate and elegant theoretical constructions, have been numerical computer simulations and neutron spin echo measurements . We show here that the dynamical correlations of the spin-glass transition are embedded in measurements of the four-spin correlations at very long times. This information is directly available in the temporal correlations of the intensity, which encode the spin-orientation memory, obtained by the technique of resonant magnetic x-ray photon correlation spectroscopy (RM- XPCS). We have implemented this method to observe and accurately characterize the critical slowing down of the spin orientation fluctuations in the classic metallic spin glass alloy Cu(Mn) over time scales of 1 to 1000 secs. Our method opens the way for studying phase transitions in systems such as spin ices, and quantum spin liquids, as well as the structural glass transition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.04259v1-abstract-full').style.display = 'none'; document.getElementById('2002.04259v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.02072">arXiv:1910.02072</a> <span> [<a href="https://arxiv.org/pdf/1910.02072">pdf</a>, <a href="https://arxiv.org/format/1910.02072">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="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/10.1038/s41467-019-12502-0">10.1038/s41467-019-12502-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Scale-invariant magnetic textures in the strongly correlated oxide NdNiO$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">Jiarui Li</a>, <a href="/search/cond-mat?searchtype=author&query=Pelliciari%2C+J">Jonathan Pelliciari</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Catalano%2C+S">Sara Catalano</a>, <a href="/search/cond-mat?searchtype=author&query=Simmons%2C+F">Forrest Simmons</a>, <a href="/search/cond-mat?searchtype=author&query=Sadowski%2C+J+T">Jerzy T. Sadowski</a>, <a href="/search/cond-mat?searchtype=author&query=Levitan%2C+A">Abraham Levitan</a>, <a href="/search/cond-mat?searchtype=author&query=Gibert%2C+M">Marta Gibert</a>, <a href="/search/cond-mat?searchtype=author&query=Carlson%2C+E">Erica Carlson</a>, <a href="/search/cond-mat?searchtype=author&query=Triscone%2C+J">Jean-Marc Triscone</a>, <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S">Stuart Wilkins</a>, <a href="/search/cond-mat?searchtype=author&query=Comin%2C+R">Riccardo Comin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.02072v1-abstract-short" style="display: inline;"> Strongly correlated quantum solids are characterized by an inherently granular electronic fabric, with spatial patterns that can span multiple length scales in proximity to a critical point. Here, we used a resonant magnetic X-ray scattering nanoprobe with sub-100 nm spatial resolution to directly visualize the texture of antiferromagnetic domains in NdNiO$_3$. Surprisingly, our measurements revea… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.02072v1-abstract-full').style.display = 'inline'; document.getElementById('1910.02072v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.02072v1-abstract-full" style="display: none;"> Strongly correlated quantum solids are characterized by an inherently granular electronic fabric, with spatial patterns that can span multiple length scales in proximity to a critical point. Here, we used a resonant magnetic X-ray scattering nanoprobe with sub-100 nm spatial resolution to directly visualize the texture of antiferromagnetic domains in NdNiO$_3$. Surprisingly, our measurements revealed a highly textured magnetic fabric, which is shown to be robust and nonvolatile even after thermal erasure across its ordering ($T_{N\acute{e}el}$) temperature. The scale-free distribution of antiferromagnetic domains and its non-integral dimensionality point to a hitherto-unobserved magnetic fractal geometry in this system. These scale-invariant textures directly reflect the continuous nature of the magnetic transition and the proximity of this system to a critical point. The present study not only exposes the near-critical behavior in rare earth nickelates but also underscores the potential for novel X-ray scattering nanoprobes to image the multiscale signatures of criticality near a critical point. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.02072v1-abstract-full').style.display = 'none'; document.getElementById('1910.02072v1-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 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.06666">arXiv:1905.06666</a> <span> [<a href="https://arxiv.org/pdf/1905.06666">pdf</a>, <a href="https://arxiv.org/format/1905.06666">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="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/10.1038/s41467-019-13813-y">10.1038/s41467-019-13813-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Distinct fingerprints of charge density waves and electronic standing waves in ZrTe$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Yue%2C+L">Li Yue</a>, <a href="/search/cond-mat?searchtype=author&query=Xue%2C+S">Shangjie Xue</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">Jiarui Li</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">Wen Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A">Andi Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+F">Feipeng Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+L">Lichen Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+J">Ji Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S+B">Stuart B. Wilkins</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Comin%2C+R">Riccardo Comin</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yuan Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.06666v1-abstract-short" style="display: inline;"> Experimental signatures of charge density waves (CDW) in high-temperature superconductors have evoked much recent interest, yet an alternative interpretation has been theoretically raised based on electronic standing waves resulting from quasiparticles scattering off impurities or defects, also known as Friedel oscillations (FO). Indeed the two phenomena are similar and related, posing a challenge… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.06666v1-abstract-full').style.display = 'inline'; document.getElementById('1905.06666v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.06666v1-abstract-full" style="display: none;"> Experimental signatures of charge density waves (CDW) in high-temperature superconductors have evoked much recent interest, yet an alternative interpretation has been theoretically raised based on electronic standing waves resulting from quasiparticles scattering off impurities or defects, also known as Friedel oscillations (FO). Indeed the two phenomena are similar and related, posing a challenge to their experimental differentiation. Here we report a resonant X-ray diffraction study of ZrTe$_3$, a model CDW material. Near the CDW transition, we observe two independent diffraction signatures that arise concomitantly, only to become clearly separated in momentum while developing very different correlation lengths in the well-ordered state. Anomalously slow dynamics of mesoscopic ordered nanoregions are further found near the transition temperature, in spite of the expected strong thermal fluctuations. These observations reveal that a spatially-modulated CDW phase emerges out of a uniform electronic fluid via a process that is promoted by self-amplifying FO, and identify a viable experimental route to distinguish CDW and FO. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.06666v1-abstract-full').style.display = 'none'; document.getElementById('1905.06666v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures; supplementary information available upon request</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 11, 98 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.11867">arXiv:1811.11867</a> <span> [<a href="https://arxiv.org/pdf/1811.11867">pdf</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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-018-07350-3">10.1038/s41467-018-07350-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Imaging antiferromagnetic antiphase domain boundaries using magnetic Bragg diffraction phase contrast </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+M+G">Min Gyu Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Miao%2C+H">Hu Miao</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+B">Bin Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Cheong%2C+S+-">S. -W. Cheong</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A">A. Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">Wen Hu</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=Robinson%2C+I+K">I. K. Robinson</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+M+P+M">M. P. M Dean</a>, <a href="/search/cond-mat?searchtype=author&query=Kiryukhin%2C+V">V. Kiryukhin</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="1811.11867v1-abstract-short" style="display: inline;"> Manipulating magnetic domains is essential for many technological applications. Recent breakthroughs in Antiferromagnetic Spintronics brought up novel concepts for electronic device development. Imaging antiferromagnetic domains is of key importance to this field. Unfortunately, some of the basic domain types, such as antiphase domains, cannot be imaged by conventional techniques. Herein, we prese… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.11867v1-abstract-full').style.display = 'inline'; document.getElementById('1811.11867v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.11867v1-abstract-full" style="display: none;"> Manipulating magnetic domains is essential for many technological applications. Recent breakthroughs in Antiferromagnetic Spintronics brought up novel concepts for electronic device development. Imaging antiferromagnetic domains is of key importance to this field. Unfortunately, some of the basic domain types, such as antiphase domains, cannot be imaged by conventional techniques. Herein, we present a new domain projection imaging technique based on the localization of domain boundaries by resonant magnetic diffraction of coherent x rays. Contrast arises from reduction of the scattered intensity at the domain boundaries due to destructive interference effects. We demonstrate this approach by imaging antiphase domains in a collinear antiferromagnet Fe2Mo3O8, and observe evidence of domain wall interaction with a structural defect. This technique does not involve any numerical algorithms. It is fast, sensitive, produces large-scale images in a single-exposure measurement, and is applicable to a variety of magnetic domain types. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.11867v1-abstract-full').style.display = 'none'; document.getElementById('1811.11867v1-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 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 9, Article number: 5013 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.05656">arXiv:1809.05656</a> <span> [<a href="https://arxiv.org/pdf/1809.05656">pdf</a>, <a href="https://arxiv.org/format/1809.05656">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> </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.123.197202">10.1103/PhysRevLett.123.197202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spontaneous Magnetic Superdomain Wall Fluctuations in an Artificial Antiferromagnet </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X+M">X. M. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Farmer%2C+B">B. Farmer</a>, <a href="/search/cond-mat?searchtype=author&query=Woods%2C+J+S">J. S. Woods</a>, <a href="/search/cond-mat?searchtype=author&query=Dhuey%2C+S">S. Dhuey</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">W. Hu</a>, <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=Robinson%2C+I+K">I. K. Robinson</a>, <a href="/search/cond-mat?searchtype=author&query=De+Long%2C+L+E">L. E. De Long</a>, <a href="/search/cond-mat?searchtype=author&query=Roy%2C+S">S. Roy</a>, <a href="/search/cond-mat?searchtype=author&query=Hastings%2C+J+T">J. T. Hastings</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="1809.05656v2-abstract-short" style="display: inline;"> Collective dynamics often play an important role in determining the stability of ground states for both naturally occurring materials and metamaterials. We studied the temperature dependent dynamics of antiferromagnetically ordered superdomains in a square artificial spin lattice using soft x-ray photon correlation spectroscopy. We observed an exponential slowing down of superdomain wall motion be… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.05656v2-abstract-full').style.display = 'inline'; document.getElementById('1809.05656v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.05656v2-abstract-full" style="display: none;"> Collective dynamics often play an important role in determining the stability of ground states for both naturally occurring materials and metamaterials. We studied the temperature dependent dynamics of antiferromagnetically ordered superdomains in a square artificial spin lattice using soft x-ray photon correlation spectroscopy. We observed an exponential slowing down of superdomain wall motion below the AF onset temperature, similar to the behavior of typical bulk antiferromagnets. Using a continuous time random walk model we show that these superdomain walls undergo low-temperature ballistic and high-temperature diffusive motions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.05656v2-abstract-full').style.display = 'none'; document.getElementById('1809.05656v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 123, 197202 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.09066">arXiv:1807.09066</a> <span> [<a href="https://arxiv.org/pdf/1807.09066">pdf</a>, <a href="https://arxiv.org/format/1807.09066">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-019-09433-1">10.1038/s41467-019-09433-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Persistent Charge Density Wave Memory in a Cuprate Superconductor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X+M">X. M. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+Y">Y. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Thampy%2C+V">V. Thampy</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A+M">A. M. Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">W. Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+M">M. Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Assefa%2C+T">T. Assefa</a>, <a href="/search/cond-mat?searchtype=author&query=Miao%2C+H">H. Miao</a>, <a href="/search/cond-mat?searchtype=author&query=Fabbris%2C+G">G. Fabbris</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+G+D">G. D. Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Tranquada%2C+J+M">J. M. Tranquada</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+M+P+M">M. P. M. Dean</a>, <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S+B">S. B. Wilkins</a>, <a href="/search/cond-mat?searchtype=author&query=Robinson%2C+I+K">I. K. Robinson</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="1807.09066v2-abstract-short" style="display: inline;"> Although charge density wave (CDW) correlations appear to be a ubiquitous feature of the superconducting cuprates, their disparate properties suggest a crucial role for coupling or pinning of the CDW to lattice deformations and disorder. While diffraction intensities can demonstrate the occurrence of CDW domain formation, the lack of scattering phase information has limited our understanding of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.09066v2-abstract-full').style.display = 'inline'; document.getElementById('1807.09066v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.09066v2-abstract-full" style="display: none;"> Although charge density wave (CDW) correlations appear to be a ubiquitous feature of the superconducting cuprates, their disparate properties suggest a crucial role for coupling or pinning of the CDW to lattice deformations and disorder. While diffraction intensities can demonstrate the occurrence of CDW domain formation, the lack of scattering phase information has limited our understanding of this process. Here, we report coherent resonant x-ray speckle correlation analysis, which directly determines the reproducibility of CDW domain patterns in La1.875Ba0.125CuO4 (LBCO 1/8) with thermal cycling. While CDW order is only observed below 54 K, where a structural phase transition results in equivalent Cu-O bonds, we discover remarkably reproducible CDW domain memory upon repeated cycling to temperatures well above that transition. That memory is only lost on cycling across the transition at 240(3) K that restores the four-fold symmetry of the copper-oxide planes. We infer that the structural-domain twinning pattern that develops below 240 K determines the CDW pinning landscape below 54 K. These results open a new view into the complex coupling between charge and lattice degrees of freedom in superconducting cuprates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.09066v2-abstract-full').style.display = 'none'; document.getElementById('1807.09066v2-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 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages; 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 10, 1435 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1704.00827">arXiv:1704.00827</a> <span> [<a href="https://arxiv.org/pdf/1704.00827">pdf</a>, <a href="https://arxiv.org/format/1704.00827">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.95.241111">10.1103/PhysRevB.95.241111 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Static Charge Density Wave Order in the Superconducting State of La2-xBaxCuO4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Thampy%2C+V">V. Thampy</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X+M">X. M. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+Y">Y. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A+M">A. M. Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">W. Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Miao%2C+H">H. Miao</a>, <a href="/search/cond-mat?searchtype=author&query=Fabbris%2C+G">G. Fabbris</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+R+D">R. D. Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+G+D">G. D. Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Tranquada%2C+J+M">J. M. Tranquada</a>, <a href="/search/cond-mat?searchtype=author&query=Robinson%2C+I+K">I. K. Robinson</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=Dean%2C+M+P+M">M. P. M. Dean</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1704.00827v4-abstract-short" style="display: inline;"> Charge density wave (CDW) correlations feature prominently in the phase diagram of the cuprates, motivating competing theories of whether fluctuating CDW correlations aid superconductivity or whether static CDW order coexists with superconductivity in inhomogeneous or spatially modulated states. Here we report Cu $L$-edge resonant x-ray photon correlation spectroscopy (XPCS) measurements of CDW co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.00827v4-abstract-full').style.display = 'inline'; document.getElementById('1704.00827v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1704.00827v4-abstract-full" style="display: none;"> Charge density wave (CDW) correlations feature prominently in the phase diagram of the cuprates, motivating competing theories of whether fluctuating CDW correlations aid superconductivity or whether static CDW order coexists with superconductivity in inhomogeneous or spatially modulated states. Here we report Cu $L$-edge resonant x-ray photon correlation spectroscopy (XPCS) measurements of CDW correlations in superconducting La$_{2-x}$Ba$_x$CuO$_4$ $x=0.11$. Static CDW order is shown to exist in the superconducting state at low temperatures and to persist up to at least 85\% of the CDW transition temperature. We discuss the implications of our observations for how \emph{nominally} competing order parameters can coexist in the cuprates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.00827v4-abstract-full').style.display = 'none'; document.getElementById('1704.00827v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures, Accepted in Phys. Rev. B Rapid Communications</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 95, 241111(R) (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.01209">arXiv:1703.01209</a> <span> [<a href="https://arxiv.org/pdf/1703.01209">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"> Perovskite Quantum Organismoids </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zuo%2C+F">Fan Zuo</a>, <a href="/search/cond-mat?searchtype=author&query=Panda%2C+P">Priyadarshini Panda</a>, <a href="/search/cond-mat?searchtype=author&query=Kotiuga%2C+M">Michele Kotiuga</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">Jiarui Li</a>, <a href="/search/cond-mat?searchtype=author&query=Kang%2C+M+G">Min Gu Kang</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+H">Hua Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A">Andi Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S">Stuart Wilkins</a>, <a href="/search/cond-mat?searchtype=author&query=Narayanan%2C+B">Badri Narayanan</a>, <a href="/search/cond-mat?searchtype=author&query=Cherukara%2C+M">Mathew Cherukara</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+Z">Zhen Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Sankaranarayanan%2C+S+K+R+S">Subramanian K. R. S. Sankaranarayanan</a>, <a href="/search/cond-mat?searchtype=author&query=Comin%2C+R">Riccardo Comin</a>, <a href="/search/cond-mat?searchtype=author&query=Rabe%2C+K+M">Karin M. Rabe</a>, <a href="/search/cond-mat?searchtype=author&query=Roy%2C+K">Kaushik Roy</a>, <a href="/search/cond-mat?searchtype=author&query=Ramanathan%2C+S">Shriram Ramanathan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1703.01209v1-abstract-short" style="display: inline;"> A central characteristic of living beings is the ability to learn from and respond to their environment leading to habit formation and decision making1-3. This behavior, known as habituation, is universal among forms of life with a central nervous system, and interestingly observed even in single cellular organisms that do not possess a brain4-5. Here, we report the discovery of habituation based… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.01209v1-abstract-full').style.display = 'inline'; document.getElementById('1703.01209v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.01209v1-abstract-full" style="display: none;"> A central characteristic of living beings is the ability to learn from and respond to their environment leading to habit formation and decision making1-3. This behavior, known as habituation, is universal among forms of life with a central nervous system, and interestingly observed even in single cellular organisms that do not possess a brain4-5. Here, we report the discovery of habituation based plasticity utilizing a perovskite quantum system by dynamical modulation of electron localization via reversible dopant incorporation. Microscopic mechanisms and pathways that enable this organismic collective charge-lattice interaction are elucidated by a combination of first-principles theory, synchrotron investigations, ab-initio dynamical simulations and in-situ environmental breathing studies. We implement a new learning algorithm inspired from the conductance relaxation behavior of perovskites that naturally incorporates habituation and demonstrate "learning to forget": a key feature of animal and human brains6. Most surprisingly, our results show that incorporating this elementary skill in learning dramatically boosts the capability of artificial cognitive systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.01209v1-abstract-full').style.display = 'none'; document.getElementById('1703.01209v1-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 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1606.04168">arXiv:1606.04168</a> <span> [<a href="https://arxiv.org/pdf/1606.04168">pdf</a>, <a href="https://arxiv.org/format/1606.04168">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.117.167001">10.1103/PhysRevLett.117.167001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Remarkable Stability of Charge Density Wave Order in La$_{1.875}$Ba$_{0.125}$CuO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X+M">X. M. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Thampy%2C+V">V. Thampy</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Barbour%2C+A+M">A. M. Barbour</a>, <a href="/search/cond-mat?searchtype=author&query=Miao%2C+H">H. Miao</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+G+D">G. D. Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+Y">Y. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Tranquada%2C+J+M">J. M. Tranquada</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+M+P+M">M. P. M. Dean</a>, <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S+B">S. B. Wilkins</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="1606.04168v3-abstract-short" style="display: inline;"> The occurrence of charge-density-wave (CDW) order in underdoped cuprates is now well established, although the precise nature of the CDW and its relationship with superconductivity is not. Theoretical proposals include contrasting ideas such as that pairing may be driven by CDW fluctuations or that static CDWs may intertwine with a spatially-modulated superconducting wave function. We test the dyn… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.04168v3-abstract-full').style.display = 'inline'; document.getElementById('1606.04168v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.04168v3-abstract-full" style="display: none;"> The occurrence of charge-density-wave (CDW) order in underdoped cuprates is now well established, although the precise nature of the CDW and its relationship with superconductivity is not. Theoretical proposals include contrasting ideas such as that pairing may be driven by CDW fluctuations or that static CDWs may intertwine with a spatially-modulated superconducting wave function. We test the dynamics of CDW order in La$_{1.825}$Ba$_{0.125}$CuO$_4$ by using x-ray photon correlation spectroscopy (XPCS) at the CDW wave vector, detected resonantly at the Cu $L_3$-edge. We find that the CDW domains are strikingly static, with no evidence of significant fluctuations up to 2\,\nicefrac{3}{4} hours. We discuss the implications of these results for some of the competing theories. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.04168v3-abstract-full').style.display = 'none'; document.getElementById('1606.04168v3-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, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted for publication in Physical Review Letters; 6 pages, 4 figures; + supplementary</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 117, 167001 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1504.03848">arXiv:1504.03848</a> <span> [<a href="https://arxiv.org/pdf/1504.03848">pdf</a>, <a href="https://arxiv.org/format/1504.03848">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.94.054421">10.1103/PhysRevB.94.054421 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Control of the magnetic phase coexistence in NdFe$_3$(BO$_3$)$_4$ by electric fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Partzsch%2C+S">S. Partzsch</a>, <a href="/search/cond-mat?searchtype=author&query=Hamann-Borrero%2C+J+E">J. E. Hamann-Borrero</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Herrero-Martin%2C+J">J. Herrero-Martin</a>, <a href="/search/cond-mat?searchtype=author&query=Vasiliev%2C+A">A. Vasiliev</a>, <a href="/search/cond-mat?searchtype=author&query=Bezmaternykh%2C+L">L. Bezmaternykh</a>, <a href="/search/cond-mat?searchtype=author&query=B%C3%BCchner%2C+B">B. B眉chner</a>, <a href="/search/cond-mat?searchtype=author&query=Geck%2C+J">J. Geck</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1504.03848v1-abstract-short" style="display: inline;"> We present a resonant x-ray diffraction study of the magnetic order in NdFe$_3$(BO$_3$)$_4$ and its coupling to applied electric fields. Our high-resolution measurements reveal A coexistence of two different magnetic phases, which can be triggered effectively by external electric fields. More in detail, the volume fraction of the collinear magnetic phase is found to strongly increase at the expens… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.03848v1-abstract-full').style.display = 'inline'; document.getElementById('1504.03848v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1504.03848v1-abstract-full" style="display: none;"> We present a resonant x-ray diffraction study of the magnetic order in NdFe$_3$(BO$_3$)$_4$ and its coupling to applied electric fields. Our high-resolution measurements reveal A coexistence of two different magnetic phases, which can be triggered effectively by external electric fields. More in detail, the volume fraction of the collinear magnetic phase is found to strongly increase at the expense of helically ordered regions when an electric field is applied. These results confirm that the collinear magnetic phase is responsible for the ferroelectric polarization of NdFe$_3$(BO$_3$)$_4$ and, more importantly, demonstrate that magnetic phase coexistence provides an alternative route towards materials with a strong magnetoelectric response. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.03848v1-abstract-full').style.display = 'none'; document.getElementById('1504.03848v1-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 April, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 94, 054421 (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/1403.0283">arXiv:1403.0283</a> <span> [<a href="https://arxiv.org/pdf/1403.0283">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/ncomms4714">10.1038/ncomms4714 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-energy spin and charge excitations in electron-doped copper oxide superconductors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ishii%2C+K">K. Ishii</a>, <a href="/search/cond-mat?searchtype=author&query=Fujita%2C+M">M. Fujita</a>, <a href="/search/cond-mat?searchtype=author&query=Sasaki%2C+T">T. Sasaki</a>, <a href="/search/cond-mat?searchtype=author&query=Minola%2C+M">M. Minola</a>, <a href="/search/cond-mat?searchtype=author&query=Dellea%2C+G">G. Dellea</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Kummer%2C+K">K. Kummer</a>, <a href="/search/cond-mat?searchtype=author&query=Ghiringhelli%2C+G">G. Ghiringhelli</a>, <a href="/search/cond-mat?searchtype=author&query=Braicovich%2C+L">L. Braicovich</a>, <a href="/search/cond-mat?searchtype=author&query=Tohyama%2C+T">T. Tohyama</a>, <a href="/search/cond-mat?searchtype=author&query=Tsutsumi%2C+K">K. Tsutsumi</a>, <a href="/search/cond-mat?searchtype=author&query=Sato%2C+K">K. Sato</a>, <a href="/search/cond-mat?searchtype=author&query=Kajimoto%2C+R">R. Kajimoto</a>, <a href="/search/cond-mat?searchtype=author&query=Ikeuchi%2C+K">K. Ikeuchi</a>, <a href="/search/cond-mat?searchtype=author&query=Yamada%2C+K">K. Yamada</a>, <a href="/search/cond-mat?searchtype=author&query=Yoshida%2C+M">M. Yoshida</a>, <a href="/search/cond-mat?searchtype=author&query=Kurooka%2C+M">M. Kurooka</a>, <a href="/search/cond-mat?searchtype=author&query=Mizuki%2C+J">J. Mizuki</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="1403.0283v1-abstract-short" style="display: inline;"> The evolution of electronic (spin and charge) excitations upon carrier doping is an extremely important issue in superconducting layered cuprates and the knowledge of its asymmetry between electron- and hole-dopings is still fragmentary. Here we combine x-ray and neutron inelastic scattering measurements to track the doping dependence of both spin and charge excitations in electron-doped materials… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.0283v1-abstract-full').style.display = 'inline'; document.getElementById('1403.0283v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1403.0283v1-abstract-full" style="display: none;"> The evolution of electronic (spin and charge) excitations upon carrier doping is an extremely important issue in superconducting layered cuprates and the knowledge of its asymmetry between electron- and hole-dopings is still fragmentary. Here we combine x-ray and neutron inelastic scattering measurements to track the doping dependence of both spin and charge excitations in electron-doped materials. Copper L3 resonant inelastic x-ray scattering spectra show that magnetic excitations shift to higher energy upon doping. Their dispersion becomes steeper near the magnetic zone center and deeply mix with charge excitations, indicating that electrons acquire a highly itinerant character in the doped metallic state. Moreover, above the magnetic excitations, an additional dispersing feature is observed near the 螕-point, and we ascribe it to particle-hole charge excitations. These properties are in stark contrast with the more localized spin-excitations (paramagnons) recently observed in hole-doped compounds even at high doping-levels. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.0283v1-abstract-full').style.display = 'none'; document.getElementById('1403.0283v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 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">Comments:</span> <span class="has-text-grey-dark mathjax">20 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/1403.0061">arXiv:1403.0061</a> <span> [<a href="https://arxiv.org/pdf/1403.0061">pdf</a>, <a href="https://arxiv.org/ps/1403.0061">ps</a>, <a href="https://arxiv.org/format/1403.0061">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.89.220511">10.1103/PhysRevB.89.220511 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct observation of bulk charge modulations in optimally-doped Bi$_{1.5}$Pb$_{0.6}$Sr$_{1.54}$CaCu$_{2}$O$_{8+未}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hashimoto%2C+M">M. Hashimoto</a>, <a href="/search/cond-mat?searchtype=author&query=Ghiringhelli%2C+G">G. Ghiringhelli</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+W+-">W. -S. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Dellea%2C+G">G. Dellea</a>, <a href="/search/cond-mat?searchtype=author&query=Amorese%2C+A">A. Amorese</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Kummer%2C+K">K. Kummer</a>, <a href="/search/cond-mat?searchtype=author&query=Brookes%2C+N+B">N. B. Brookes</a>, <a href="/search/cond-mat?searchtype=author&query=Moritz%2C+B">B. Moritz</a>, <a href="/search/cond-mat?searchtype=author&query=Yoshida%2C+Y">Y. Yoshida</a>, <a href="/search/cond-mat?searchtype=author&query=Eisaki%2C+H">H. Eisaki</a>, <a href="/search/cond-mat?searchtype=author&query=Hussain%2C+Z">Z. Hussain</a>, <a href="/search/cond-mat?searchtype=author&query=Devereaux%2C+T+P">T. P. Devereaux</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Z+-">Z. -X. Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Braicovich%2C+L">L. Braicovich</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="1403.0061v2-abstract-short" style="display: inline;"> Bulk charge density modulations, recently observed in high critical-temperature ($T_\mathrm{c}$) cuprate superconductors, coexist with the so-called pseudogap and compete with superconductivity. However, its direct observation has been limited to a narrow doping region in the underdoped regime. Using energy-resolved resonant x-ray scattering we have found evidence for such bulk charge modulations,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.0061v2-abstract-full').style.display = 'inline'; document.getElementById('1403.0061v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1403.0061v2-abstract-full" style="display: none;"> Bulk charge density modulations, recently observed in high critical-temperature ($T_\mathrm{c}$) cuprate superconductors, coexist with the so-called pseudogap and compete with superconductivity. However, its direct observation has been limited to a narrow doping region in the underdoped regime. Using energy-resolved resonant x-ray scattering we have found evidence for such bulk charge modulations, or soft collective charge modes (soft CCMs), in optimally doped Bi$_{1.5}$Pb$_{0.6}$Sr$_{1.54}$CaCu$_{2}$O$_{8+未}$ (Pb-Bi2212) around the summit of the superconducting dome with momentum transfer $q_{\parallel}\sim0.28$ reciprocal lattice units (r.l.u.) along the Cu-O bond direction. The signal is stronger at $T\simeq T_\mathrm{c}$ than at lower temperatures, thereby confirming a competition between soft CCMs and superconductivity. These results demonstrate that soft CCMs are not constrained to the underdoped regime, suggesting that soft CCMs appear across a large part of the phase diagram of cuprates and are intimately entangled with high-$T_\mathrm{c}$ superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.0061v2-abstract-full').style.display = 'none'; document.getElementById('1403.0061v2-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, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 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">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures, 1 table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 89, 220511(R)(2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1212.5580">arXiv:1212.5580</a> <span> [<a href="https://arxiv.org/pdf/1212.5580">pdf</a>, <a href="https://arxiv.org/format/1212.5580">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.110.187001">10.1103/PhysRevLett.110.187001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Momentum-dependent charge correlations in YBa$_2$Cu$_3$O$_{6+未}$ superconductors probed by resonant x-ray scattering: Evidence for three competing phases </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Blanco-Canosa%2C+S">S. Blanco-Canosa</a>, <a href="/search/cond-mat?searchtype=author&query=Frano%2C+A">A. Frano</a>, <a href="/search/cond-mat?searchtype=author&query=Loew%2C+T">T. Loew</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+Y">Y. Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Porras%2C+J">J. Porras</a>, <a href="/search/cond-mat?searchtype=author&query=Ghiringhelli%2C+G">G. Ghiringhelli</a>, <a href="/search/cond-mat?searchtype=author&query=Minola%2C+M">M. Minola</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Braicovich%2C+L">L. Braicovich</a>, <a href="/search/cond-mat?searchtype=author&query=Schierle%2C+E">E. Schierle</a>, <a href="/search/cond-mat?searchtype=author&query=Weschke%2C+E">E. Weschke</a>, <a href="/search/cond-mat?searchtype=author&query=Tacon%2C+M+L">M. Le Tacon</a>, <a href="/search/cond-mat?searchtype=author&query=Keimer%2C+B">B. Keimer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1212.5580v3-abstract-short" style="display: inline;"> We have used resonant x-ray scattering to determine the momentum dependent charge correlations in YBa$_2$Cu$_3$O$_{6.55}$ samples with highly ordered chain arrays of oxygen acceptors (ortho-II structure). The results reveal nearly critical, biaxial charge density wave (CDW) correlations at in-plane wave vectors (0.315, 0) and (0, 0.325). The corresponding scattering intensity exhibits a strong uni… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.5580v3-abstract-full').style.display = 'inline'; document.getElementById('1212.5580v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1212.5580v3-abstract-full" style="display: none;"> We have used resonant x-ray scattering to determine the momentum dependent charge correlations in YBa$_2$Cu$_3$O$_{6.55}$ samples with highly ordered chain arrays of oxygen acceptors (ortho-II structure). The results reveal nearly critical, biaxial charge density wave (CDW) correlations at in-plane wave vectors (0.315, 0) and (0, 0.325). The corresponding scattering intensity exhibits a strong uniaxial anisotropy. The CDW amplitude and correlation length are enhanced as superconductivity is weakened by an external magnetic field. Analogous experiments were carried out on a YBa$_2$Cu$_3$O$_{6.6}$ crystal with a dilute concentration of spinless (Zn) impurities, which had earlier been shown to nucleate incommensurate magnetic order. Compared to pristine crystals with the same doping level, the CDW amplitude and correlation length were found to be strongly reduced. These results indicate a three-phase competition between spin-modulated, charge-modulated, and superconducting states in underdoped YBa$_2$Cu$_3$O$_{6+未}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.5580v3-abstract-full').style.display = 'none'; document.getElementById('1212.5580v3-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 April, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 December, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures revised version, to appear in 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/1211.2543">arXiv:1211.2543</a> <span> [<a href="https://arxiv.org/pdf/1211.2543">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.4768680">10.1063/1.4768680 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charge localization at the interface between La1-xSrxMnO3 and the infinite layers cuprate CaCuO2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Yang%2C+N">Nan Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Di+Castro%2C+D">D. Di Castro</a>, <a href="/search/cond-mat?searchtype=author&query=Aruta%2C+C">C. Aruta</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Minola%2C+M">M. Minola</a>, <a href="/search/cond-mat?searchtype=author&query=Brookes%2C+N">N. Brookes</a>, <a href="/search/cond-mat?searchtype=author&query=Sala%2C+M+M">M. Moretti Sala</a>, <a href="/search/cond-mat?searchtype=author&query=Prellier%2C+W">W. Prellier</a>, <a href="/search/cond-mat?searchtype=author&query=Lebedev%2C+O+I">O. I. Lebedev</a>, <a href="/search/cond-mat?searchtype=author&query=Tebano%2C+A">A. Tebano</a>, <a href="/search/cond-mat?searchtype=author&query=Balestrino%2C+G">G. Balestrino</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="1211.2543v1-abstract-short" style="display: inline;"> (CaCuO2)m/(La0.7Sr0.3MnO3)n superlattices, consisting of the infinite layers cuprate CaCuO2 and the optimally doped manganite La1-xSrxMnO3, were grown by pulsed laser deposition. The transport properties are dominated by the manganite block. X-Ray Absorption spectroscopy measurements show a clear evidence of an orbital reconstruction at the interface, ascribed to the hybridization between the Cu 3… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.2543v1-abstract-full').style.display = 'inline'; document.getElementById('1211.2543v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1211.2543v1-abstract-full" style="display: none;"> (CaCuO2)m/(La0.7Sr0.3MnO3)n superlattices, consisting of the infinite layers cuprate CaCuO2 and the optimally doped manganite La1-xSrxMnO3, were grown by pulsed laser deposition. The transport properties are dominated by the manganite block. X-Ray Absorption spectroscopy measurements show a clear evidence of an orbital reconstruction at the interface, ascribed to the hybridization between the Cu 3d3z2-r2 and the Mn 3d3z2-r2 orbitals via interface apical oxygen ions. Such a mechanism localizes holes at the interfaces, thus preventing charge transfer to the CaCuO2 block. Some charge (holes) transfer occurs toward the La0.7Sr0.3MnO3 block in strongly oxidized superlattices, contributing to the suppression of the magnetotransport properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.2543v1-abstract-full').style.display = 'none'; document.getElementById('1211.2543v1-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 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">20 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Appl. Phys. 112, 123901 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1207.6913">arXiv:1207.6913</a> <span> [<a href="https://arxiv.org/pdf/1207.6913">pdf</a>, <a href="https://arxiv.org/ps/1207.6913">ps</a>, <a href="https://arxiv.org/format/1207.6913">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.109.267202">10.1103/PhysRevLett.109.267202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic frustration, phase competition and the magneto-electric effect in NdFe3(BO3)4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hamann-Borrero%2C+J+E">J. E. Hamann-Borrero</a>, <a href="/search/cond-mat?searchtype=author&query=Partzsch%2C+S">S. Partzsch</a>, <a href="/search/cond-mat?searchtype=author&query=Valencia%2C+S">S. Valencia</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Herrero-Martin%2C+J">J. Herrero-Martin</a>, <a href="/search/cond-mat?searchtype=author&query=Feyerherm%2C+R">R. Feyerherm</a>, <a href="/search/cond-mat?searchtype=author&query=Dudzik%2C+E">E. Dudzik</a>, <a href="/search/cond-mat?searchtype=author&query=Hess%2C+C">C. Hess</a>, <a href="/search/cond-mat?searchtype=author&query=Vasiliev%2C+A">A. Vasiliev</a>, <a href="/search/cond-mat?searchtype=author&query=Bezmaternykh%2C+L">L. Bezmaternykh</a>, <a href="/search/cond-mat?searchtype=author&query=Buechner%2C+B">B. Buechner</a>, <a href="/search/cond-mat?searchtype=author&query=Geck%2C+J">J. Geck</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1207.6913v1-abstract-short" style="display: inline;"> We present an element selective resonant magnetic x-ray scattering study of NdFe3(BO3)4 as a function of temperature and applied magnetic field. Our measurements show that the magnetic order of the Nd sublattice is induced by the Fe spin order. When a magnetic field is applied parallel to the hexagonal basal plane, the helicoidal spin order is suppressed and a collinear ordering, where the moments… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.6913v1-abstract-full').style.display = 'inline'; document.getElementById('1207.6913v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1207.6913v1-abstract-full" style="display: none;"> We present an element selective resonant magnetic x-ray scattering study of NdFe3(BO3)4 as a function of temperature and applied magnetic field. Our measurements show that the magnetic order of the Nd sublattice is induced by the Fe spin order. When a magnetic field is applied parallel to the hexagonal basal plane, the helicoidal spin order is suppressed and a collinear ordering, where the moments are forced to align in a direction perpendicular to the applied magnetic field, is stabilized. This result excludes a non-collinear spin order as the origin of the magnetically induced electric polarization in this compound. Instead our data imply that magnetic frustration results in a phase competition, which is the origin of the magneto-electric response. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.6913v1-abstract-full').style.display = 'none'; document.getElementById('1207.6913v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 July, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 109, 267202 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1207.3667">arXiv:1207.3667</a> <span> [<a href="https://arxiv.org/pdf/1207.3667">pdf</a>, <a href="https://arxiv.org/format/1207.3667">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.109.167001">10.1103/PhysRevLett.109.167001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Distinct Charge Orders in the Planes and Chains of Ortho-III-Ordered YBa$_2$Cu$_3$O$_{6+未}$ Superconductors Identified by Resonant Elastic X-ray Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Achkar%2C+A+J">A. J. Achkar</a>, <a href="/search/cond-mat?searchtype=author&query=Sutarto%2C+R">R. Sutarto</a>, <a href="/search/cond-mat?searchtype=author&query=Mao%2C+X">X. Mao</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+F">F. He</a>, <a href="/search/cond-mat?searchtype=author&query=Frano%2C+A">A. Frano</a>, <a href="/search/cond-mat?searchtype=author&query=Blanco-Canosa%2C+S">S. Blanco-Canosa</a>, <a href="/search/cond-mat?searchtype=author&query=Tacon%2C+M+L">M. Le Tacon</a>, <a href="/search/cond-mat?searchtype=author&query=Ghiringhelli%2C+G">G. Ghiringhelli</a>, <a href="/search/cond-mat?searchtype=author&query=Braicovich%2C+L">L. Braicovich</a>, <a href="/search/cond-mat?searchtype=author&query=Minola%2C+M">M. Minola</a>, <a href="/search/cond-mat?searchtype=author&query=Sala%2C+M+M">M. Moretti Sala</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Liang%2C+R">Ruixing Liang</a>, <a href="/search/cond-mat?searchtype=author&query=Bonn%2C+D+A">D. A. Bonn</a>, <a href="/search/cond-mat?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/cond-mat?searchtype=author&query=Keimer%2C+B">B. Keimer</a>, <a href="/search/cond-mat?searchtype=author&query=Sawatzky%2C+G+A">G. A. Sawatzky</a>, <a href="/search/cond-mat?searchtype=author&query=Hawthorn%2C+D+G">D. G. Hawthorn</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1207.3667v2-abstract-short" style="display: inline;"> Recently, charge density wave (CDW) order in the CuO$_2$ planes of underdoped YBa$_2$Cu$_3$O$_{6+未}$ was detected using resonant soft x-ray scattering. An important question remains: is the chain layer responsible for this charge ordering? Here, we explore the energy and polarization dependence of the resonant scattering intensity in a detwinned sample of YBa$_2$Cu$_3$O$_{6.75}$ with ortho-III oxy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.3667v2-abstract-full').style.display = 'inline'; document.getElementById('1207.3667v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1207.3667v2-abstract-full" style="display: none;"> Recently, charge density wave (CDW) order in the CuO$_2$ planes of underdoped YBa$_2$Cu$_3$O$_{6+未}$ was detected using resonant soft x-ray scattering. An important question remains: is the chain layer responsible for this charge ordering? Here, we explore the energy and polarization dependence of the resonant scattering intensity in a detwinned sample of YBa$_2$Cu$_3$O$_{6.75}$ with ortho-III oxygen ordering in the chain layer. We show that the ortho-III CDW order in the chains is distinct from the CDW order in the planes. The ortho-III structure gives rise to a commensurate superlattice reflection at $Q$=[0.33 0 $L$] whose energy and polarization dependence agrees with expectations for oxygen ordering and a spatial modulation of the Cu valence in the chains. Incommensurate peaks at [0.30 0 $L$] and [0 0.30 $L$] from the CDW order in the planes are shown to be distinct in $Q$ as well as their temperature, energy, and polarization dependence, and are thus unrelated to the structure of the chain layer. Moreover, the energy dependence of the CDW order in the planes is shown to result from a spatial modulation of energies of the Cu 2$p$ to 3$d_{x^2-y^2}$ transition, similar to stripe-ordered 214 cuprates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.3667v2-abstract-full').style.display = 'none'; document.getElementById('1207.3667v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 November, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 July, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 109, 167001 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1207.0915">arXiv:1207.0915</a> <span> [<a href="https://arxiv.org/pdf/1207.0915">pdf</a>, <a href="https://arxiv.org/format/1207.0915">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/10.1126/science.1223532">10.1126/science.1223532 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O(6+x) </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ghiringhelli%2C+G">G. Ghiringhelli</a>, <a href="/search/cond-mat?searchtype=author&query=Tacon%2C+M+L">M. Le Tacon</a>, <a href="/search/cond-mat?searchtype=author&query=Minola%2C+M">M. Minola</a>, <a href="/search/cond-mat?searchtype=author&query=Blanco-Canosa%2C+S">S. Blanco-Canosa</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Brookes%2C+N+B">N. B. Brookes</a>, <a href="/search/cond-mat?searchtype=author&query=De+Luca%2C+G+M">G. M. De Luca</a>, <a href="/search/cond-mat?searchtype=author&query=Frano%2C+A">A. Frano</a>, <a href="/search/cond-mat?searchtype=author&query=Hawthorn%2C+D+G">D. G. Hawthorn</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+F">F. He</a>, <a href="/search/cond-mat?searchtype=author&query=Loew%2C+T">T. Loew</a>, <a href="/search/cond-mat?searchtype=author&query=Sala%2C+M+M">M. Moretti Sala</a>, <a href="/search/cond-mat?searchtype=author&query=Peets%2C+D+C">D. C. Peets</a>, <a href="/search/cond-mat?searchtype=author&query=Salluzzo%2C+M">M. Salluzzo</a>, <a href="/search/cond-mat?searchtype=author&query=Schierle%2C+E">E. Schierle</a>, <a href="/search/cond-mat?searchtype=author&query=Sutarto%2C+R">R. Sutarto</a>, <a href="/search/cond-mat?searchtype=author&query=Sawatzky%2C+G+A">G. A. Sawatzky</a>, <a href="/search/cond-mat?searchtype=author&query=Weschke%2C+E">E. Weschke</a>, <a href="/search/cond-mat?searchtype=author&query=Keimer%2C+B">B. Keimer</a>, <a href="/search/cond-mat?searchtype=author&query=Braicovich%2C+L">L. Braicovich</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1207.0915v1-abstract-short" style="display: inline;"> There are increasing indications that superconductivity competes with other orders in cuprate superconductors, but obtaining direct evidence with bulk-sensitive probes is challenging. We have used resonant soft x-ray scattering to identify two-dimensional charge fluctuations with an incommensurate periodicity of $\bf \sim 3.2$ lattice units in the copper-oxide planes of the superconductors (Y,Nd)B… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.0915v1-abstract-full').style.display = 'inline'; document.getElementById('1207.0915v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1207.0915v1-abstract-full" style="display: none;"> There are increasing indications that superconductivity competes with other orders in cuprate superconductors, but obtaining direct evidence with bulk-sensitive probes is challenging. We have used resonant soft x-ray scattering to identify two-dimensional charge fluctuations with an incommensurate periodicity of $\bf \sim 3.2$ lattice units in the copper-oxide planes of the superconductors (Y,Nd)Ba$_2$Cu$_3$O$_{6+x}$ with hole concentrations $0.09 \leq p \leq 0.13$ per planar Cu ion. The intensity and correlation length of the fluctuation signal increase strongly upon cooling down to the superconducting transition temperature, $T_c$; further cooling below $T_c$ abruptly reverses the divergence of the charge correlations. In combination with prior observations of a large gap in the spin excitation spectrum, these data indicate an incipient charge-density-wave instability that competes with superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.0915v1-abstract-full').style.display = 'none'; document.getElementById('1207.0915v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 July, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">to appear in Science</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science 337, 821 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1205.4920">arXiv:1205.4920</a> <span> [<a href="https://arxiv.org/pdf/1205.4920">pdf</a>, <a href="https://arxiv.org/ps/1205.4920">ps</a>, <a href="https://arxiv.org/format/1205.4920">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.85.224403">10.1103/PhysRevB.85.224403 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Magnetic Structure of DyMn2O5 Determined by Resonant X-ray Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Johnstone%2C+G+E">G. E. Johnstone</a>, <a href="/search/cond-mat?searchtype=author&query=Ewings%2C+R+A">R. A. Ewings</a>, <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+R+D">R. D. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+H+C">H. C. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Boothroyd%2C+A+T">A. T. Boothroyd</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1205.4920v1-abstract-short" style="display: inline;"> Resonant magnetic x-ray scattering has been used to investigate the magnetic structure of the magnetoelectric multiferroic DyMn2O5. We have studied the magnetic structure in the ferroelectric phase of this material, which displays the strongest ferroelectric polarisation and magnetodielectric effect of the RMn2O5 (where R is a rare earth ion, Y or Bi) family. The magnetic structure observed is sim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.4920v1-abstract-full').style.display = 'inline'; document.getElementById('1205.4920v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1205.4920v1-abstract-full" style="display: none;"> Resonant magnetic x-ray scattering has been used to investigate the magnetic structure of the magnetoelectric multiferroic DyMn2O5. We have studied the magnetic structure in the ferroelectric phase of this material, which displays the strongest ferroelectric polarisation and magnetodielectric effect of the RMn2O5 (where R is a rare earth ion, Y or Bi) family. The magnetic structure observed is similar to that of the other members of the series, but differs in the direction of the ordered moments. In DyMn2O5 both the Dy and Mn moments lie close to the b-axis, whereas in other RMn2O5 they lie close to the a-axis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.4920v1-abstract-full').style.display = 'none'; document.getElementById('1205.4920v1-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 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1111.0541">arXiv:1111.0541</a> <span> [<a href="https://arxiv.org/pdf/1111.0541">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.85.184107">10.1103/PhysRevB.85.184107 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On the role of intrinsic disorder in the structural phase transition of magnetoelectric EuTiO3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Allieta%2C+M">Mattia Allieta</a>, <a href="/search/cond-mat?searchtype=author&query=Scavini%2C+M">Marco Scavini</a>, <a href="/search/cond-mat?searchtype=author&query=Spalek%2C+L">Leszek Spalek</a>, <a href="/search/cond-mat?searchtype=author&query=Scagnoli%2C+V">Valerio Scagnoli</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+H+C">Helen C. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Panagopoulos%2C+C">Christos Panagopoulos</a>, <a href="/search/cond-mat?searchtype=author&query=Saxena%2C+S">Siddharth Saxena</a>, <a href="/search/cond-mat?searchtype=author&query=Katsufuji%2C+T">Takuro Katsufuji</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio 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="1111.0541v2-abstract-short" style="display: inline;"> Up to now the crystallographic structure of the magnetoelectric perovskite EuTiO3 was considered to remain cubic down to low temperature. Here we present high resolution synchrotron X-ray powder diffraction data showing the existence of a structural phase transition, from cubic Pm-3m to tetragonal I4/mcm, involving TiO6 octahedra tilting, in analogy to the case of SrTiO3. The temperature evolution… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.0541v2-abstract-full').style.display = 'inline'; document.getElementById('1111.0541v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1111.0541v2-abstract-full" style="display: none;"> Up to now the crystallographic structure of the magnetoelectric perovskite EuTiO3 was considered to remain cubic down to low temperature. Here we present high resolution synchrotron X-ray powder diffraction data showing the existence of a structural phase transition, from cubic Pm-3m to tetragonal I4/mcm, involving TiO6 octahedra tilting, in analogy to the case of SrTiO3. The temperature evolution of the tilting angle indicates a second-order phase transition with an estimated Tc=235K. This critical temperature is well below the recent anomaly reported by specific heat measurement at TA\sim282K. By performing atomic pair distribution function analysis on diffraction data we provide evidence of a mismatch between the local (short-range) and the average crystallographic structures in this material. Below the estimated Tc, the average model symmetry is fully compatible with the local environment distortion but the former is characterized by a reduced value of the tilting angle compared to the latter. At T=240K data show the presence of local octahedra tilting identical to the low temperature one, while the average crystallographic structure remains cubic. On this basis, we propose intrinsic lattice disorder to be of fundamental importance in the understanding of EuTiO3 properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.0541v2-abstract-full').style.display = 'none'; document.getElementById('1111.0541v2-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 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">13 pages, 8 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 85, 184107 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.2239">arXiv:1107.2239</a> <span> [<a href="https://arxiv.org/pdf/1107.2239">pdf</a>, <a href="https://arxiv.org/ps/1107.2239">ps</a>, <a href="https://arxiv.org/format/1107.2239">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.86.134524">10.1103/PhysRevB.86.134524 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High Tc superconductivity in superlattices of insulating oxides </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Di+Castro%2C+D">D. Di Castro</a>, <a href="/search/cond-mat?searchtype=author&query=Salvato%2C+M">M. Salvato</a>, <a href="/search/cond-mat?searchtype=author&query=Tebano%2C+A">A. Tebano</a>, <a href="/search/cond-mat?searchtype=author&query=Innocenti%2C+D">D. Innocenti</a>, <a href="/search/cond-mat?searchtype=author&query=Aruta%2C+C">C. Aruta</a>, <a href="/search/cond-mat?searchtype=author&query=Prellier%2C+W">W. Prellier</a>, <a href="/search/cond-mat?searchtype=author&query=Lebedev%2C+O+I">O. I. Lebedev</a>, <a href="/search/cond-mat?searchtype=author&query=Ottaviani%2C+I">I. Ottaviani</a>, <a href="/search/cond-mat?searchtype=author&query=Brookes%2C+N+B">N. B. Brookes</a>, <a href="/search/cond-mat?searchtype=author&query=Minola%2C+M">M. Minola</a>, <a href="/search/cond-mat?searchtype=author&query=Sala%2C+M+M">M. Moretti Sala</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Medaglia%2C+P+G">P. G. Medaglia</a>, <a href="/search/cond-mat?searchtype=author&query=Ghiringhelli%2C+G">G. Ghiringhelli</a>, <a href="/search/cond-mat?searchtype=author&query=Cirillo%2C+L+B+M">L. Braicovich M. Cirillo</a>, <a href="/search/cond-mat?searchtype=author&query=Balestrino%2C+G">G. Balestrino</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="1107.2239v3-abstract-short" style="display: inline;"> We report the occurrence of superconductivity, with maximum Tc = 40 K, in superlattices (SLs) based on two insulating oxides, namely CaCuO2 and SrTiO3. In these (CaCuO2)n/(SrTiO3)m SLs, the CuO2 planes belong only to CaCuO2 block, which is an antiferromagnetic insulator. Superconductivity, confined within few unit cells at the CaCuO2/SrTiO3 interface, shows up only when the SLs are grown in a high… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.2239v3-abstract-full').style.display = 'inline'; document.getElementById('1107.2239v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.2239v3-abstract-full" style="display: none;"> We report the occurrence of superconductivity, with maximum Tc = 40 K, in superlattices (SLs) based on two insulating oxides, namely CaCuO2 and SrTiO3. In these (CaCuO2)n/(SrTiO3)m SLs, the CuO2 planes belong only to CaCuO2 block, which is an antiferromagnetic insulator. Superconductivity, confined within few unit cells at the CaCuO2/SrTiO3 interface, shows up only when the SLs are grown in a highly oxidizing atmosphere, because of extra oxygen ions entering at the interfaces. Evidence is reported that the hole doping of the CuO2 planes is obtained by charge transfer from the interface layers, which act as charge reservoir. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.2239v3-abstract-full').style.display = 'none'; document.getElementById('1107.2239v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 November, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">18 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 86, 134524 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.1778">arXiv:1107.1778</a> <span> [<a href="https://arxiv.org/pdf/1107.1778">pdf</a>, <a href="https://arxiv.org/ps/1107.1778">ps</a>, <a href="https://arxiv.org/format/1107.1778">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.84.054419">10.1103/PhysRevB.84.054419 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Strong coupling of Sm and Fe magnetism in SmFeAsO as revealed by magnetic x-ray scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Nandi%2C+S">S. Nandi</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Y">Y. Su</a>, <a href="/search/cond-mat?searchtype=author&query=Xiao%2C+Y">Y. Xiao</a>, <a href="/search/cond-mat?searchtype=author&query=Price%2C+S">S. Price</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+X+F">X. F. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X+H">X. H. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Herrero-Mart%C3%ADn%2C+J">J. Herrero-Mart铆n</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+H+C">H. C. Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Paolasini%2C+L">L. Paolasini</a>, <a href="/search/cond-mat?searchtype=author&query=Francoual%2C+S">S. Francoual</a>, <a href="/search/cond-mat?searchtype=author&query=Shukla%2C+D+K">D. K. Shukla</a>, <a href="/search/cond-mat?searchtype=author&query=Strempfer%2C+J">J. Strempfer</a>, <a href="/search/cond-mat?searchtype=author&query=Chatterji%2C+T">T. Chatterji</a>, <a href="/search/cond-mat?searchtype=author&query=Kumar%2C+C+M+N">C. M. N. Kumar</a>, <a href="/search/cond-mat?searchtype=author&query=Mittal%2C+R">R. Mittal</a>, <a href="/search/cond-mat?searchtype=author&query=R%C3%B8nnow%2C+H+M">H. M. R酶nnow</a>, <a href="/search/cond-mat?searchtype=author&query=R%C3%BCegg%2C+C">Ch. R眉egg</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=Br%C3%BCckel%2C+T">Th. Br眉ckel</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="1107.1778v1-abstract-short" style="display: inline;"> The magnetic structures adopted by the Fe and Sm sublattices in SmFeAsO have been investigated using element specific x-ray resonant and non-resonant magnetic scattering techniques. Between 110 and 5 K, the Sm and Fe moments are aligned along the c and a directions, respectively according to the same magnetic representation $螕_{5}$ and the same propagation vector (1, 0, 0.5). Below 5 K, magnetic o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.1778v1-abstract-full').style.display = 'inline'; document.getElementById('1107.1778v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.1778v1-abstract-full" style="display: none;"> The magnetic structures adopted by the Fe and Sm sublattices in SmFeAsO have been investigated using element specific x-ray resonant and non-resonant magnetic scattering techniques. Between 110 and 5 K, the Sm and Fe moments are aligned along the c and a directions, respectively according to the same magnetic representation $螕_{5}$ and the same propagation vector (1, 0, 0.5). Below 5 K, magnetic order of both sublattices change to a different magnetic structure and the Sm moments reorder in a magnetic unit cell equal to the chemical unit cell. Modeling of the temperature dependence for the Sm sublattice as well as a change in the magnetic structure below 5 K provide a clear evidence of a surprisingly strong coupling between the two sublattices, and indicate the need to include anisotropic exchange interactions in models of SmFeAsO and related compounds. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.1778v1-abstract-full').style.display = 'none'; document.getElementById('1107.1778v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">8 pages, 7 figures, accepted for publication in Phys. Rev. B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 84, 054419 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1106.4860">arXiv:1106.4860</a> <span> [<a href="https://arxiv.org/pdf/1106.4860">pdf</a>, <a href="https://arxiv.org/ps/1106.4860">ps</a>, <a href="https://arxiv.org/format/1106.4860">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.83.054438">10.1103/PhysRevB.83.054438 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetically induced electric polarization reversal in multiferroic TbMn$_2$O$_5$: Terbium spin reorientation studied by resonant x-ray diffraction </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=Mazzoli%2C+C">C. Mazzoli</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=Du%2C+C">C-H. Du</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="1106.4860v1-abstract-short" style="display: inline;"> In multiferroic TbMn$_2$O$_5$, the behavior of the terbium ions forms a crucial part of the magneto-electric coupling. The result is a magnetically induced reversal of the electric polarization at 2 T. In this article we present the first direct measurement of the terbium magnetic structure under applied magnetic fields. Contrary to the current interpretation of the magnetic properties of \tmo, we… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.4860v1-abstract-full').style.display = 'inline'; document.getElementById('1106.4860v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1106.4860v1-abstract-full" style="display: none;"> In multiferroic TbMn$_2$O$_5$, the behavior of the terbium ions forms a crucial part of the magneto-electric coupling. The result is a magnetically induced reversal of the electric polarization at 2 T. In this article we present the first direct measurement of the terbium magnetic structure under applied magnetic fields. Contrary to the current interpretation of the magnetic properties of \tmo, we show that upon the electric polarization reversal the terbium sub-lattice adopts a canted antiferromagnetic structure with a large component of magnetic moment parallel to the \textit{a}-axis. Furthermore, we provide evidence for a coupling between the manganese 3d magnetic structure and the terbium $4f$ magnetism, which is of great significance in the elusive magneto-electric mechanisms at play. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.4860v1-abstract-full').style.display = 'none'; document.getElementById('1106.4860v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 June, 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">4 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 83, 054438 (2011) </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/1104.3880">arXiv:1104.3880</a> <span> [<a href="https://arxiv.org/pdf/1104.3880">pdf</a>, <a href="https://arxiv.org/ps/1104.3880">ps</a>, <a href="https://arxiv.org/format/1104.3880">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.106.197204">10.1103/PhysRevLett.106.197204 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Slow Magnetic Order-Order Transition in the Spin Chain Antiferromagnet Ca3Co2O6 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Agrestini%2C+S">S. Agrestini</a>, <a href="/search/cond-mat?searchtype=author&query=Fleck%2C+C+L">C. L. Fleck</a>, <a href="/search/cond-mat?searchtype=author&query=Chapon%2C+L+C">L. C. Chapon</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Bombardi%2C+A">A. Bombardi</a>, <a href="/search/cond-mat?searchtype=author&query=Lees%2C+M+R">M. R. Lees</a>, <a href="/search/cond-mat?searchtype=author&query=Petrenko%2C+O+A">O. A. Petrenko</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="1104.3880v2-abstract-short" style="display: inline;"> Using powder neutron diffraction we have discovered an unusual magnetic order-order transition in the Ising spin chain compound Ca3Co2O6. On lowering the temperature an antiferromagnetic phase with propagation vector k=(0.5,-0.5,1) emerges from a higher temperature spin density wave structure with k=(0, 0, 1.01). This transition occurs over an unprecedented time-scale of several hours and is never… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.3880v2-abstract-full').style.display = 'inline'; document.getElementById('1104.3880v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.3880v2-abstract-full" style="display: none;"> Using powder neutron diffraction we have discovered an unusual magnetic order-order transition in the Ising spin chain compound Ca3Co2O6. On lowering the temperature an antiferromagnetic phase with propagation vector k=(0.5,-0.5,1) emerges from a higher temperature spin density wave structure with k=(0, 0, 1.01). This transition occurs over an unprecedented time-scale of several hours and is never complete. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.3880v2-abstract-full').style.display = 'none'; document.getElementById('1104.3880v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">4 pages + 2 pages of supplementary information, to appear in Physical Review Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 106, 197204 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1102.4787">arXiv:1102.4787</a> <span> [<a href="https://arxiv.org/pdf/1102.4787">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.83.184101">10.1103/PhysRevB.83.184101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Structural changes at the semiconductor-insulator phase transition in the single layered La0.5Sr1.5MnO4 perovskite </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Herrero-Martin%2C+J">J. Herrero-Martin</a>, <a href="/search/cond-mat?searchtype=author&query=Blasco%2C+J">J. Blasco</a>, <a href="/search/cond-mat?searchtype=author&query=Garcia%2C+J">J. Garcia</a>, <a href="/search/cond-mat?searchtype=author&query=Subias%2C+G">G. Subias</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="1102.4787v1-abstract-short" style="display: inline;"> The semiconductor-insulator phase transition of the single-layer manganite La0.5Sr1.5MnO4 has been studied by means of high resolution synchrotron x-ray powder diffraction and resonant x-ray scattering at the Mn K edge. We conclude that a concomitant structural transition from tetragonal I4/mmm to orthorhombic Cmcm phases drives this electronic transition. A detailed symmetry-mode analysis reveals… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.4787v1-abstract-full').style.display = 'inline'; document.getElementById('1102.4787v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1102.4787v1-abstract-full" style="display: none;"> The semiconductor-insulator phase transition of the single-layer manganite La0.5Sr1.5MnO4 has been studied by means of high resolution synchrotron x-ray powder diffraction and resonant x-ray scattering at the Mn K edge. We conclude that a concomitant structural transition from tetragonal I4/mmm to orthorhombic Cmcm phases drives this electronic transition. A detailed symmetry-mode analysis reveals that condensation of three soft modes -Delta_2(B2u), X1+(B2u) and X1+(A)- acting on the oxygen atoms accounts for the structural transformation. The Delta_2 mode leads to a pseudo Jahn-Teller distortion (in the orthorhombic bc-plane only) on one Mn site (Mn1) whereas the two X1+ modes produce an overall contraction of the other Mn site (Mn2) and expansion of the Mn1 one. The X1+ modes are responsible for the tetragonal superlattice (1/2,1/2,0)-type reflections in agreement with a checkerboard ordering of two different Mn sites. A strong enhancement of the scattered intensity has been observed for these superlattice reflections close to the Mn K edge, which could be ascribed to some degree of charge disproportion between the two Mn sites of about 0.15 electrons. We also found that the local geometrical anisotropy of the Mn1 atoms and its ordering originated by the condensed Delta_2 mode alone perfectly explains the resonant scattering of forbidden (1/4,1/4,0)-type reflections without invoking any orbital ordering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.4787v1-abstract-full').style.display = 'none'; document.getElementById('1102.4787v1-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, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">3 tables and 10 figures; accepted in Phys. Rev. B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1102.2179">arXiv:1102.2179</a> <span> [<a href="https://arxiv.org/pdf/1102.2179">pdf</a>, <a href="https://arxiv.org/ps/1102.2179">ps</a>, <a href="https://arxiv.org/format/1102.2179">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.83.100402">10.1103/PhysRevB.83.100402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Synthesis and Characterization of Single Crystal Samples of Spin-$1/2$ Kagome Lattice Antiferromagnets in the Zn-Paratacamite Family Zn$_{x}$Cu$_{4-x}$(OH)$_{6}$Cl$_{2}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Han%2C+T">Tianheng Han</a>, <a href="/search/cond-mat?searchtype=author&query=Helton%2C+J+S">Joel S. Helton</a>, <a href="/search/cond-mat?searchtype=author&query=Chu%2C+S">Shaoyan Chu</a>, <a href="/search/cond-mat?searchtype=author&query=Prodi%2C+A">Andrea Prodi</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+D+K">Deepak K. Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=M%C3%BCller%2C+P">Peter M眉ller</a>, <a href="/search/cond-mat?searchtype=author&query=Nocera%2C+D+G">Daniel G. Nocera</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+Y+S">Young S. Lee</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1102.2179v1-abstract-short" style="display: inline;"> The Zn-paratacamite family, Zn$_{x}$Cu$_{4-x}$(OH)$_{6}$Cl$_{2}$ for $x \, \geq$ 0.33, is an ideal system for studying spin-1/2 frustrated magnetism in the form of antiferromagnetic Cu$^{2+}$ kagome planes. Here we report a new synthesis method by which high quality millimeter-sized single crystals of Zn-paratacamite have been produced. These crystals have been characterized by metal analysis, x-r… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.2179v1-abstract-full').style.display = 'inline'; document.getElementById('1102.2179v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1102.2179v1-abstract-full" style="display: none;"> The Zn-paratacamite family, Zn$_{x}$Cu$_{4-x}$(OH)$_{6}$Cl$_{2}$ for $x \, \geq$ 0.33, is an ideal system for studying spin-1/2 frustrated magnetism in the form of antiferromagnetic Cu$^{2+}$ kagome planes. Here we report a new synthesis method by which high quality millimeter-sized single crystals of Zn-paratacamite have been produced. These crystals have been characterized by metal analysis, x-ray diffraction, neutron diffraction, and thermodynamic measurements. The $x$ = 1 member of the series displays a magnetic susceptibility that is slightly anisotropic at high temperatures with $蠂_{c} \, > \, 蠂_{ab}$. Neutron and synchrotron x-ray diffraction experiments confirm the quality of these $x$ = 1 single crystals and indicate no obvious structural transition down to temperatures of T=2 K. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.2179v1-abstract-full').style.display = 'none'; document.getElementById('1102.2179v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 February, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">4 pages, 3 figures, accepted by PRB rapid communication</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 83, 100402(R) (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1011.1142">arXiv:1011.1142</a> <span> [<a href="https://arxiv.org/pdf/1011.1142">pdf</a>, <a href="https://arxiv.org/ps/1011.1142">ps</a>, <a href="https://arxiv.org/format/1011.1142">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.83.104408">10.1103/PhysRevB.83.104408 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic order, metamagnetic transitions, and low-temperature spin freezing in Ca3Co2O6: an NMR study </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Allodi%2C+G">G. Allodi</a>, <a href="/search/cond-mat?searchtype=author&query=De+Renzi%2C+R">R. De Renzi</a>, <a href="/search/cond-mat?searchtype=author&query=Agrestini%2C+S">S. Agrestini</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Lees%2C+M+R">M. R. Lees</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1011.1142v2-abstract-short" style="display: inline;"> We report on a 59Co NMR investigation of the trigonal cobaltate Ca3Co2O6 carried out on a single crystal, providing precise determinations of the electric field gradient and chemical shift tensors, and of the internal magnetic fields at the non-magnetic Co I sites, unavailable from former studies on powders. The magnetic field-induced ferri- and ferromagnetic phases at intermediate temperature (e.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1011.1142v2-abstract-full').style.display = 'inline'; document.getElementById('1011.1142v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1011.1142v2-abstract-full" style="display: none;"> We report on a 59Co NMR investigation of the trigonal cobaltate Ca3Co2O6 carried out on a single crystal, providing precise determinations of the electric field gradient and chemical shift tensors, and of the internal magnetic fields at the non-magnetic Co I sites, unavailable from former studies on powders. The magnetic field-induced ferri- and ferromagnetic phases at intermediate temperature (e.g. 10 K) are identified by distinct internal fields, well accounted for by purely dipolar interactions. The vanishing transferred hyperfine field at the Co I site indicates that the Co3+(I) orbitals do not participate in the intra-chain superexchange, in disagreement with a previous theoretical model. The strong Ising character of the system is confirmed experimentally by the field dependence of the resonance lines, indicating that local moments are saturated even at the phase boundaries. In the vicinity of the critical fields, nuclear spin-spin relaxations detect the spin reversal dynamics of large magnetic assemblies, either Ising chain fragments or finite size domains, which drive the metamagnetic transitions. Such collective excitations exhibit a glassy behavior, slowing down to subacoustic frequencies and freezing at low temperature. The relevance of such slow fluctuation modes for the low-temperature multi-step behavior reported in the magnetization is discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1011.1142v2-abstract-full').style.display = 'none'; document.getElementById('1011.1142v2-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 January, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 November, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 11 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/1002.0240">arXiv:1002.0240</a> <span> [<a href="https://arxiv.org/pdf/1002.0240">pdf</a>, <a href="https://arxiv.org/ps/1002.0240">ps</a>, <a href="https://arxiv.org/format/1002.0240">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="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.81.195104">10.1103/PhysRevB.81.195104 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> 5d-5f Electric-multipole Transitions in Uranium Dioxide Probed by Non-resonant Inelastic X-ray Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Caciuffo%2C+R">R. Caciuffo</a>, <a href="/search/cond-mat?searchtype=author&query=van+der+Laan%2C+G">G. van der Laan</a>, <a href="/search/cond-mat?searchtype=author&query=Simonelli%2C+L">L. Simonelli</a>, <a href="/search/cond-mat?searchtype=author&query=Vitova%2C+T">T. Vitova</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Denecke%2C+M+A">M. A. Denecke</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="1002.0240v1-abstract-short" style="display: inline;"> Non-resonant inelastic x ray scattering (NIXS) experiments have been performed to probe the 5d-5f electronic transitions at the uranium O(4,5) absorption edges in uranium dioxide. For small values of the scattering vector q, the spectra are dominated by dipole-allowed transitions encapsulated within the giant resonance, whereas for higher values of q the multipolar transitions of rank 3 and 5 gi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.0240v1-abstract-full').style.display = 'inline'; document.getElementById('1002.0240v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1002.0240v1-abstract-full" style="display: none;"> Non-resonant inelastic x ray scattering (NIXS) experiments have been performed to probe the 5d-5f electronic transitions at the uranium O(4,5) absorption edges in uranium dioxide. For small values of the scattering vector q, the spectra are dominated by dipole-allowed transitions encapsulated within the giant resonance, whereas for higher values of q the multipolar transitions of rank 3 and 5 give rise to strong and well-defined multiplet structure in the pre-edge region. The origin of the observed non-dipole multiplet structures is explained on the basis of many-electron atomic spectral calculations. The results obtained demonstrate the high potential of NIXS as a bulk-sensitive technique for the characterization of the electronic properties of actinide materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.0240v1-abstract-full').style.display = 'none'; document.getElementById('1002.0240v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to Physical Review Letters on 31 December 2009</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 81, 195104 ?2010? </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0912.4467">arXiv:0912.4467</a> <span> [<a href="https://arxiv.org/pdf/0912.4467">pdf</a>, <a href="https://arxiv.org/ps/0912.4467">ps</a>, <a href="https://arxiv.org/format/0912.4467">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.81.245115">10.1103/PhysRevB.81.245115 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Cd-doping effects in Ce2MIn8 (M = Rh and Ir) heavy fermion compounds </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Adriano%2C+C">C. Adriano</a>, <a href="/search/cond-mat?searchtype=author&query=Giles%2C+C">C. Giles</a>, <a href="/search/cond-mat?searchtype=author&query=Bittar%2C+E+M">E. M. Bittar</a>, <a href="/search/cond-mat?searchtype=author&query=Coelho%2C+L+N">L. N. Coelho</a>, <a href="/search/cond-mat?searchtype=author&query=de+Bergevin%2C+F">F. de Bergevin</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Paolasini%2C+L">L. Paolasini</a>, <a href="/search/cond-mat?searchtype=author&query=Ratcliff%2C+W">W. Ratcliff</a>, <a href="/search/cond-mat?searchtype=author&query=Bindel%2C+R">R. Bindel</a>, <a href="/search/cond-mat?searchtype=author&query=Lynn%2C+J+W">J. W. Lynn</a>, <a href="/search/cond-mat?searchtype=author&query=Fisk%2C+Z">Z. Fisk</a>, <a href="/search/cond-mat?searchtype=author&query=Pagliuso%2C+P+G">P. G. Pagliuso</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="0912.4467v1-abstract-short" style="display: inline;"> Low temperature magnetic properties of Cd-doped Ce2MIn8 (M = Rh and Ir) single crystals are investigated. Experiments of temperature dependent magnetic susceptibility, heat capacity and electrical resistivity measurements revealed that Cd-doping enhances the antiferromagnetic (AFM) ordering temperature from TN = 2.8 K (x = 0) to TN = 4.8 K (x = 0.21) for Ce2RhIn8-xCdx and induces long range AFM… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0912.4467v1-abstract-full').style.display = 'inline'; document.getElementById('0912.4467v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0912.4467v1-abstract-full" style="display: none;"> Low temperature magnetic properties of Cd-doped Ce2MIn8 (M = Rh and Ir) single crystals are investigated. Experiments of temperature dependent magnetic susceptibility, heat capacity and electrical resistivity measurements revealed that Cd-doping enhances the antiferromagnetic (AFM) ordering temperature from TN = 2.8 K (x = 0) to TN = 4.8 K (x = 0.21) for Ce2RhIn8-xCdx and induces long range AFM ordering with TN = 3.8 K (x = 0.21) for Ce2IrIn8-xCdx. Additionally, X-ray and neutron magnetic scattering studies showed that Cd-doped samples present below TN a commensurate antiferromagnetic structure with a propagation vector (1/2,1/2,0). The resolved magnetic structures for both compounds indicate that the Cd-doping tends to rotate the direction of the ordered magnetic moments toward the ab-plane. This result suggests that the Cd-doping affects the Ce3+ ground state single ion anisotropy modifying the crystalline electrical field (CEF) parameters at the Ce3+ site. Indications of CEF evolution induced by Cd-doping were also found in the electrical resistivity measurements. Comparisons between our results and the general effects of Cd-doping on the related compounds CeMIn5 (M = Co, Rh and Ir) confirms the claims that the Cd-doping induced electronic tuning is the main effect favoring AFM ordering in these compounds. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0912.4467v1-abstract-full').style.display = 'none'; document.getElementById('0912.4467v1-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 December, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 81, 245115 (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0910.5788">arXiv:0910.5788</a> <span> [<a href="https://arxiv.org/pdf/0910.5788">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/10.1088/1742-6596/190/1/012086">10.1088/1742-6596/190/1/012086 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charge and orbital ordering in Fe and Mn perovskite oxides far from half- doping by resonant x- ray scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Herrero-Martin%2C+J">Javier Herrero-Martin</a>, <a href="/search/cond-mat?searchtype=author&query=Garc%C3%ADa%2C+J">Joaqu铆n Garc铆a</a>, <a href="/search/cond-mat?searchtype=author&query=Javier%2C+B">Blasco Javier</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Sub%C3%ADas%2C+G">G. Sub铆as</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="0910.5788v1-abstract-short" style="display: inline;"> The emergence of superlattice periodicities at metal to insulator transitions in hole doped perovskite oxides responds to a rearrangement of the local atomic structure, and electron and spin density distribution. Originally, the ionic model based on a checkerboard- type atomic distribution served to describe the low temperature charge and orbital ordered (COO) phases arising in half- doped manga… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0910.5788v1-abstract-full').style.display = 'inline'; document.getElementById('0910.5788v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0910.5788v1-abstract-full" style="display: none;"> The emergence of superlattice periodicities at metal to insulator transitions in hole doped perovskite oxides responds to a rearrangement of the local atomic structure, and electron and spin density distribution. Originally, the ionic model based on a checkerboard- type atomic distribution served to describe the low temperature charge and orbital ordered (COO) phases arising in half- doped manganites. In the last years, the exploitation of resonant x- ray scattering (RXS) capabilities has shown the need to revisit these concepts and improve the picture. Yet, we have realised that COO is a more common phenomenon than expected that can be observed in a wide range of doping levels. Here we compare the experimental data recently collected by RXS on La_0.4Sr_1.6MnO_4 (x=0.60) and La(Pr)_1/3Sr_2/3FeO_3 (x=0.67). The first shows a COO phase similar to that found in the x=0.5 sample but angular peak positions vs. T denotes the incommensurability of superlattice reflections. Meanwhile, the analysis of the commensurate CO phase in the studied ferrite underlines the role of the structural changes also involving La(Sr) and O atoms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0910.5788v1-abstract-full').style.display = 'none'; document.getElementById('0910.5788v1-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 October, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2009. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0906.3541">arXiv:0906.3541</a> <span> [<a href="https://arxiv.org/pdf/0906.3541">pdf</a>, <a href="https://arxiv.org/ps/0906.3541">ps</a>, <a href="https://arxiv.org/format/0906.3541">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.81.085107">10.1103/PhysRevB.81.085107 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental evidence of anapolar moments in the antiferromagnetic insulating phase of V2O3 obtained from x-ray resonant Bragg diffraction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fernandez-Rodriguez%2C+J">J. Fernandez-Rodriguez</a>, <a href="/search/cond-mat?searchtype=author&query=Scagnoli%2C+V">V. Scagnoli</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Fabrizi%2C+F">F. Fabrizi</a>, <a href="/search/cond-mat?searchtype=author&query=Lovesey%2C+S+W">S. W. Lovesey</a>, <a href="/search/cond-mat?searchtype=author&query=Blanco%2C+J+A">J. A. Blanco</a>, <a href="/search/cond-mat?searchtype=author&query=Sivia%2C+D+S">D. S. Sivia</a>, <a href="/search/cond-mat?searchtype=author&query=Knight%2C+K+S">K. S. Knight</a>, <a href="/search/cond-mat?searchtype=author&query=de+Bergevin%2C+F">F. de Bergevin</a>, <a href="/search/cond-mat?searchtype=author&query=Paolasini%2C+L">L. Paolasini</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="0906.3541v1-abstract-short" style="display: inline;"> We have investigated the antiferromagnetic insulating phase of the Mott-Hubbard insulator V$_2$O$_3$ by resonant x-ray Bragg diffraction at the vanadium K-edge. Combining the information obtained from azimuthal angle scans, linear incoming polarization scans and by fitting collected data to the scattering amplitude derived from the established chemical I2/a and magnetic space groups we provide e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.3541v1-abstract-full').style.display = 'inline'; document.getElementById('0906.3541v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0906.3541v1-abstract-full" style="display: none;"> We have investigated the antiferromagnetic insulating phase of the Mott-Hubbard insulator V$_2$O$_3$ by resonant x-ray Bragg diffraction at the vanadium K-edge. Combining the information obtained from azimuthal angle scans, linear incoming polarization scans and by fitting collected data to the scattering amplitude derived from the established chemical I2/a and magnetic space groups we provide evidence of the ordering motif of anapolar moments (which results from parity violation coupling to an electromagnetic field). Experimental data (azimuthal dependence and polarization analysis) collected at space-group forbidden Bragg reflections are successfully accounted within our model in terms of vanadium magnetoelectric multipoles. We demonstrate that resonant x-ray diffraction intensities in all space-group forbidden Bragg reflections of the kind $(hkl)_m$ with odd $h$ are produced by an E1-E2 event. The determined tensorial parameters offer a test for ab-initio calculations in this material, that can lead to a deeper and more quantitative understanding of the physical properties of V$_2$O$_3$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.3541v1-abstract-full').style.display = 'none'; document.getElementById('0906.3541v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 June, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 81, 085107 (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0906.1508">arXiv:0906.1508</a> <span> [<a href="https://arxiv.org/pdf/0906.1508">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> <p class="title is-5 mathjax"> EuFe_2As_2 magnetic structure determination </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Herrero-Martin%2C+J">Javier Herrero-Martin</a>, <a href="/search/cond-mat?searchtype=author&query=Scagnoli%2C+V">Valerio Scagnoli</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">Claudio Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Y">Yixi Su</a>, <a href="/search/cond-mat?searchtype=author&query=Mittal%2C+R">Ranjal Mittal</a>, <a href="/search/cond-mat?searchtype=author&query=Xiao%2C+Y">Y. Xiao</a>, <a href="/search/cond-mat?searchtype=author&query=Br%C3%BCckel%2C+T">Th. Br眉ckel</a>, <a href="/search/cond-mat?searchtype=author&query=Kumar%2C+N">Neeraj Kumar</a>, <a href="/search/cond-mat?searchtype=author&query=Dhar%2C+S+K">S. K. Dhar</a>, <a href="/search/cond-mat?searchtype=author&query=Thamizhavel%2C+A">A. Thamizhavel</a>, <a href="/search/cond-mat?searchtype=author&query=Paolasini%2C+L">Luigi Paolasini</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="0906.1508v3-abstract-short" style="display: inline;"> Magnetic resonant X ray scattering experiments have been performed on a single crystal of EuFe_2As_2 at the Eu L_3 absorption edge. This has permitted us to determine for the first time the orientation of Eu magnetic moments in the antiferromagnetic ordered phase below T_N=19 K as parallel to the a-axis. In addition, non-resonant magnetic X ray measurements indicate that Fe magnetic moments alig… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.1508v3-abstract-full').style.display = 'inline'; document.getElementById('0906.1508v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0906.1508v3-abstract-full" style="display: none;"> Magnetic resonant X ray scattering experiments have been performed on a single crystal of EuFe_2As_2 at the Eu L_3 absorption edge. This has permitted us to determine for the first time the orientation of Eu magnetic moments in the antiferromagnetic ordered phase below T_N=19 K as parallel to the a-axis. In addition, non-resonant magnetic X ray measurements indicate that Fe magnetic moments align along the same direction in the spin density wave phase (T<T_S~190 K). Temperature dependences indicate that the onset of the Eu AFM phase barely affects the Fe magnetic sublattice. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.1508v3-abstract-full').style.display = 'none'; document.getElementById('0906.1508v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 September, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 June, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">accepted for publication in Phys. Rev. B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0812.3094">arXiv:0812.3094</a> <span> [<a href="https://arxiv.org/pdf/0812.3094">pdf</a>, <a href="https://arxiv.org/ps/0812.3094">ps</a>, <a href="https://arxiv.org/format/0812.3094">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.103.077602">10.1103/PhysRevLett.103.077602 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct observation of charge order and orbital glass state in multiferroic LuFe2O4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mulders%2C+A+M">A. M. Mulders</a>, <a href="/search/cond-mat?searchtype=author&query=Lawrence%2C+S+M">S. M. Lawrence</a>, <a href="/search/cond-mat?searchtype=author&query=Staub%2C+U">U. Staub</a>, <a href="/search/cond-mat?searchtype=author&query=Garcia-Fernandez%2C+M">M. Garcia-Fernandez</a>, <a href="/search/cond-mat?searchtype=author&query=Scagnoli%2C+V">V. Scagnoli</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Pomjakushina%2C+E">E. Pomjakushina</a>, <a href="/search/cond-mat?searchtype=author&query=Conder%2C+K">K. Conder</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Y. Wang</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="0812.3094v2-abstract-short" style="display: inline;"> Geometrical frustration of the Fe ions in LuFe2O4 leads to intricate charge and magnetic order and a strong magnetoelectric coupling. Using resonant x-ray diffraction at the Fe K edge, the anomalous scattering factors of both Fe sites are deduced from the (h/3 k/3 l/2) reflections. The chemical shift between the two types of Fe ions equals 4.0(1) eV corresponding to full charge separation into F… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0812.3094v2-abstract-full').style.display = 'inline'; document.getElementById('0812.3094v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0812.3094v2-abstract-full" style="display: none;"> Geometrical frustration of the Fe ions in LuFe2O4 leads to intricate charge and magnetic order and a strong magnetoelectric coupling. Using resonant x-ray diffraction at the Fe K edge, the anomalous scattering factors of both Fe sites are deduced from the (h/3 k/3 l/2) reflections. The chemical shift between the two types of Fe ions equals 4.0(1) eV corresponding to full charge separation into Fe2+ and Fe3+. Polarization and azimuthal angle dependence of the superlattice reflections demonstrates the absence of anisotropic scattering revealing random orientations of the Fe2+ orbitals characteristic of an orbital glass state. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0812.3094v2-abstract-full').style.display = 'none'; document.getElementById('0812.3094v2-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 July, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 December, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">v2: refined analysis, added supplement, PRL, accepted for publication</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PRL 103 (2009) 077602. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0811.3350">arXiv:0811.3350</a> <span> [<a href="https://arxiv.org/pdf/0811.3350">pdf</a>, <a href="https://arxiv.org/format/0811.3350">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.79.201102">10.1103/PhysRevB.79.201102 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A critical re-examination of resonant soft x-ray Bragg forbidden reflections in magnetite </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=Di+Matteo%2C+S">S. Di Matteo</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=Joly%2C+Y">Y. Joly</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Hatton%2C+P+D">P. D. Hatton</a>, <a href="/search/cond-mat?searchtype=author&query=Bencok%2C+P">P. Bencok</a>, <a href="/search/cond-mat?searchtype=author&query=Yakhou%2C+F">F. Yakhou</a>, <a href="/search/cond-mat?searchtype=author&query=Brabers%2C+V+A+M">V. A. M. Brabers</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0811.3350v2-abstract-short" style="display: inline;"> Magnetite, Fe$_3$O$_4$, displays a highly complex low temperature crystal structure that may be charge and orbitally ordered. Many of the recent experimental claims of such ordering rely on resonant soft x-ray diffraction at the oxygen K and iron L edges. We have re-examined this system and undertaken soft x-ray diffraction experiments on a high-quality single crystal. Contrary to previous claim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.3350v2-abstract-full').style.display = 'inline'; document.getElementById('0811.3350v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0811.3350v2-abstract-full" style="display: none;"> Magnetite, Fe$_3$O$_4$, displays a highly complex low temperature crystal structure that may be charge and orbitally ordered. Many of the recent experimental claims of such ordering rely on resonant soft x-ray diffraction at the oxygen K and iron L edges. We have re-examined this system and undertaken soft x-ray diffraction experiments on a high-quality single crystal. Contrary to previous claims in the literature, we show that the intensity observed at the Bragg forbidden (001/2)$_c$ reflection can be explained purely in terms of the low-temperature structural displacements around the resonant atoms. This does not necessarily mean that magnetite is not charge or orbitally ordered, but rather that the present sensitivity of resonant soft x-ray experiments does not allow conclusive demonstration of such ordering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.3350v2-abstract-full').style.display = 'none'; document.getElementById('0811.3350v2-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, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 November, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0809.1357">arXiv:0809.1357</a> <span> [<a href="https://arxiv.org/pdf/0809.1357">pdf</a>, <a href="https://arxiv.org/ps/0809.1357">ps</a>, <a href="https://arxiv.org/format/0809.1357">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.78.100406">10.1103/PhysRevB.78.100406 <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 investigation of the multipolar ordering in Ca3Co2O6 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bombardi%2C+A">A. Bombardi</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Agrestini%2C+S">S. Agrestini</a>, <a href="/search/cond-mat?searchtype=author&query=Lees%2C+M+R">M. R. Lees</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="0809.1357v1-abstract-short" style="display: inline;"> We have performed a resonant x-ray scattering (RXS) study near the Co K edge on a single crystal of Ca3Co2O6. In the magnetically ordered phase a new class of weak reflections appears at the magnetic propagation vector tau (1/3,1/3,1/3). These new reflections allow direct access to the dipolar-quadrupolar E1E2 scattering channel. The theoretical possibility of observing isolated E1E2 electromagn… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.1357v1-abstract-full').style.display = 'inline'; document.getElementById('0809.1357v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0809.1357v1-abstract-full" style="display: none;"> We have performed a resonant x-ray scattering (RXS) study near the Co K edge on a single crystal of Ca3Co2O6. In the magnetically ordered phase a new class of weak reflections appears at the magnetic propagation vector tau (1/3,1/3,1/3). These new reflections allow direct access to the dipolar-quadrupolar E1E2 scattering channel. The theoretical possibility of observing isolated E1E2 electromagnetic multipoles has attracted a lot of interest in the recent years. Unfortunately in many system of interest, parity even and parity odd tensor contributions occur at the same positions in reciprocal space. We demonstrate that in Ca3Co2O6 it is possible to completely separate the parity even from the parity odd terms. The possibility of observing such terms even in globally centrosymmetric systems using RXS has been investigated theoretically; Ca3Co2O6 allows a symmetry based separation of this contribution. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.1357v1-abstract-full').style.display = 'none'; document.getElementById('0809.1357v1-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 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">5 pages, 4 figures, accepted for publication in Phys. Rev. B rapid communications</span> </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/0807.4489">arXiv:0807.4489</a> <span> [<a href="https://arxiv.org/pdf/0807.4489">pdf</a>, <a href="https://arxiv.org/ps/0807.4489">ps</a>, <a href="https://arxiv.org/format/0807.4489">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.101.097207">10.1103/PhysRevLett.101.097207 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The nature of the magnetic order in Ca3Co2O6 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Agrestini%2C+S">S. Agrestini</a>, <a href="/search/cond-mat?searchtype=author&query=Chapon%2C+L+C">L. C. Chapon</a>, <a href="/search/cond-mat?searchtype=author&query=Daoud-Aladine%2C+A">A. Daoud-Aladine</a>, <a href="/search/cond-mat?searchtype=author&query=Schefer%2C+J">J. Schefer</a>, <a href="/search/cond-mat?searchtype=author&query=Gukasov%2C+A">A. Gukasov</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Lees%2C+M+R">M. R. Lees</a>, <a href="/search/cond-mat?searchtype=author&query=Petrenko%2C+O+A">O. A. Petrenko</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0807.4489v1-abstract-short" style="display: inline;"> We present a detailed powder and single crystal neutron diffraction study of the spin chain compound Ca3Co2O6. Below 25 K, the system orders magnetically with a modulated partially disordered antiferromagnetic structure. We give a description of the magnetic interactions in the system which is consistent with this magnetic structure. Our study also reveals that the long-range magnetic order co-e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.4489v1-abstract-full').style.display = 'inline'; document.getElementById('0807.4489v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0807.4489v1-abstract-full" style="display: none;"> We present a detailed powder and single crystal neutron diffraction study of the spin chain compound Ca3Co2O6. Below 25 K, the system orders magnetically with a modulated partially disordered antiferromagnetic structure. We give a description of the magnetic interactions in the system which is consistent with this magnetic structure. Our study also reveals that the long-range magnetic order co-exists with a shorter range order with a correlation length scale of 180 A in the ab plane. Remarkably, on cooling, the volume of material exhibiting short range order increases at the expense of the long-range order. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.4489v1-abstract-full').style.display = 'none'; document.getElementById('0807.4489v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 July, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, submitted to Physical Review Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 101, 097207 (2008) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0801.2495">arXiv:0801.2495</a> <span> [<a href="https://arxiv.org/pdf/0801.2495">pdf</a>, <a href="https://arxiv.org/ps/0801.2495">ps</a>, <a href="https://arxiv.org/format/0801.2495">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.77.140403">10.1103/PhysRevB.77.140403 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Incommensurate magnetic ground state revealed by RXS in the frustrated spin system Ca3Co2O6 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Agrestini%2C+S">S. Agrestini</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Bombardi%2C+A">A. Bombardi</a>, <a href="/search/cond-mat?searchtype=author&query=Lees%2C+M+R">M. R. Lees</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="0801.2495v1-abstract-short" style="display: inline;"> We have performed a resonant x-ray scattering study at the Co pre-K edge on a single crystal of Ca3Co2O6. The measurements reveal an abrupt transition to a magnetically ordered state immediately below T_N = 25 K, with a magnetic correlation length in excess of 5500 脜 along the c-axis chains. There is no evidence for modifications to the Co$^{3+}$ spin state. A temperature dependent modulation in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0801.2495v1-abstract-full').style.display = 'inline'; document.getElementById('0801.2495v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0801.2495v1-abstract-full" style="display: none;"> We have performed a resonant x-ray scattering study at the Co pre-K edge on a single crystal of Ca3Co2O6. The measurements reveal an abrupt transition to a magnetically ordered state immediately below T_N = 25 K, with a magnetic correlation length in excess of 5500 脜 along the c-axis chains. There is no evidence for modifications to the Co$^{3+}$ spin state. A temperature dependent modulation in the magnetic order along the c-axis and an unusual decrease in the magnetic correlation lengths on cooling are observed. The results are compatible with the onset of a partially disordered antiferromagnetic structure in Ca3Co2O6. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0801.2495v1-abstract-full').style.display = 'none'; document.getElementById('0801.2495v1-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">originally announced</span> January 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">RevTex 4, 5 pages + 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 77, 140403(R) (2008) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0711.1241">arXiv:0711.1241</a> <span> [<a href="https://arxiv.org/pdf/0711.1241">pdf</a>, <a href="https://arxiv.org/ps/0711.1241">ps</a>, <a href="https://arxiv.org/format/0711.1241">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.76.184420">10.1103/PhysRevB.76.184420 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> X-ray Resonant Scattering Study of the Order Parameters in Multiferroic TbMnO$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mannix%2C+D">D. Mannix</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=Ewings%2C+R+A">R. A. Ewings</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=Prabhakaran%2C+D">D. Prabhakaran</a>, <a href="/search/cond-mat?searchtype=author&query=Joly%2C+Y">Y. Joly</a>, <a href="/search/cond-mat?searchtype=author&query=Janousova%2C+B">B. Janousova</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzoli%2C+C">C. Mazzoli</a>, <a href="/search/cond-mat?searchtype=author&query=Paolasini%2C+L">L. Paolasini</a>, <a href="/search/cond-mat?searchtype=author&query=Wilkins%2C+S+B">S. B. Wilkins</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="0711.1241v1-abstract-short" style="display: inline;"> We report on an extensive investigation of the multiferroic compound TbMnO$_3$. Non-resonant x-ray magnetic scattering (NRXMS) revealed a dominant $A$-type domain. The temperature dependence of the intensity and wavevector associated with the incommensurate magnetic order was found to be in good agreement with neutron scattering data. XRS experiments were performed in the vicinity of the Mn $K$… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0711.1241v1-abstract-full').style.display = 'inline'; document.getElementById('0711.1241v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0711.1241v1-abstract-full" style="display: none;"> We report on an extensive investigation of the multiferroic compound TbMnO$_3$. Non-resonant x-ray magnetic scattering (NRXMS) revealed a dominant $A$-type domain. The temperature dependence of the intensity and wavevector associated with the incommensurate magnetic order was found to be in good agreement with neutron scattering data. XRS experiments were performed in the vicinity of the Mn $K$ and Tb $L_3$ edges in the high-temperature collinear phase, the intermediate temperature cycloidal/ferroelectric phase, and the low-temperature phase. In the collinear phase resonant $E1-E1$ satellites were found at the Mn $K$ edge associated with $A$-type but also $F$-type peaks. The azimuthal dependence of the $F$-type satellites (and their absence in the NRXMS experiments) indicates that they are most likely non-magnetic in origin. We suggest instead that they may be associated with an induced charge multipole. At the Tb $L_3$ edge resonant $A$- and $F$-type satellites ($E1-E1$) were observed in the collinear phase. These we attribute to a polarisation of the Tb 5$d$ states by the ordering of the Mn sublattice. In the cycloidal/ferroelectric phase a new set of resonant satellites appear corresponding to $C$-type order. These appear at the Tb $L_3$ edge only. In addition to a dominant $E1-E1$ component in the $蟽-蟺^\prime$ channel, a weaker component is found in the pre-edge with $蟽-蟽^\prime$ polarization. Calculations of the XRS were performed using the $FDMNES$ code showing that the unrotated $蟽-蟽^\prime$ component of the Tb $L_3$ $C$-type peaks appearing in the ferroelectric phase contains a contribution from a multipole that is odd with respect to both space and time, known in various contexts as the anapole. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0711.1241v1-abstract-full').style.display = 'none'; document.getElementById('0711.1241v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 November, 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">Phys. Rev. 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