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class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.05151">arXiv:2412.05151</a> <span> [<a href="https://arxiv.org/pdf/2412.05151">pdf</a>, <a href="https://arxiv.org/format/2412.05151">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Analysis of long-lived effects in high-repetition-rate stroboscopic transient X-ray absorption experiments on thin films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=Deiter%2C+C">Carsten Deiter</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/?searchtype=author&query=Hansen%2C+K">Karsten Hansen</a>, <a href="/search/?searchtype=author&query=Hauf%2C+S">Steffen Hauf</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/?searchtype=author&query=K%C3%A4mmerer%2C+L">Lea K盲mmerer</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Lomidze%2C+D">David Lomidze</a>, <a href="/search/?searchtype=author&query=Maffessanti%2C+S">Stefano Maffessanti</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P+S">Piter S. Miedema</a> , et al. (19 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.05151v1-abstract-short" style="display: inline;"> Time-resolved X-ray absorption spectroscopy (tr-XAS) has been shown to be a versatile measurement technique for investigating non-equilibrium dynamics. Novel X-ray free electron laser (XFEL) facilities like the European XFEL offer increased repetition rates for stroboscopic XAS experiments through a burst operation mode, which enables measurements with up to 4.5 MHz. These higher repetition rates… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05151v1-abstract-full').style.display = 'inline'; document.getElementById('2412.05151v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.05151v1-abstract-full" style="display: none;"> Time-resolved X-ray absorption spectroscopy (tr-XAS) has been shown to be a versatile measurement technique for investigating non-equilibrium dynamics. Novel X-ray free electron laser (XFEL) facilities like the European XFEL offer increased repetition rates for stroboscopic XAS experiments through a burst operation mode, which enables measurements with up to 4.5 MHz. These higher repetition rates lead to higher data acquisition rates but can also introduce long-lived excitations that persist and thus build up during each burst. Here, we report on such long-lived effects in Ni and NiO thin film samples that were measured at the European XFEL. We disentangle the long-lived excitations from the initial pump-induced change and perform a detailed modelling-based analysis of how they modify transient X-ray spectra. As a result, we link the long-lived effects in Ni to a local temperature increase, as well as the effects in NiO to excited charge carrier trapping through polaron formation. In addition, we present possible correction methods, as well as discuss ways in which the effects of these long-lived excitations could be minimized for future time-resolved X-ray absorption spectroscopy measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05151v1-abstract-full').style.display = 'none'; document.getElementById('2412.05151v1-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 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.10849">arXiv:2411.10849</a> <span> [<a href="https://arxiv.org/pdf/2411.10849">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"> Non-equilibrium THz-phonon spin coupling in CrI3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Shokeen%2C+V">V Shokeen</a>, <a href="/search/?searchtype=author&query=Pavelka%2C+M">M Pavelka</a>, <a href="/search/?searchtype=author&query=Chulkov%2C+R">R Chulkov</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">A Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Rogvall%2C+J">J Rogvall</a>, <a href="/search/?searchtype=author&query=Belinch%C3%B3n%2C+D+M">D Muradas Belinch贸n</a>, <a href="/search/?searchtype=author&query=Noumbe%2C+U">U Noumbe</a>, <a href="/search/?searchtype=author&query=Abdel-Hafiez%2C+M">M Abdel-Hafiez</a>, <a href="/search/?searchtype=author&query=Kamalakar%2C+M+V">M Venkata Kamalakar</a>, <a href="/search/?searchtype=author&query=Gr%C3%A5n%C3%A4s%2C+O">O Gr氓n盲s</a>, <a href="/search/?searchtype=author&query=D%C3%BCrr%2C+H+A">H A D眉rr</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="2411.10849v1-abstract-short" style="display: inline;"> Manipulating magnetism at the THz timescale in atomically thin ferromagnets by exploiting the interactions of spins with optical phonon modes presents an innovative idea for THz spintronics. Spin-phonon coupling raises an important question about the flow of spin angular momentum possibly to chiral phonons. We use femtosecond optical pulses to generate bound electron-hole pairs (excitons) in the 2… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10849v1-abstract-full').style.display = 'inline'; document.getElementById('2411.10849v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.10849v1-abstract-full" style="display: none;"> Manipulating magnetism at the THz timescale in atomically thin ferromagnets by exploiting the interactions of spins with optical phonon modes presents an innovative idea for THz spintronics. Spin-phonon coupling raises an important question about the flow of spin angular momentum possibly to chiral phonons. We use femtosecond optical pulses to generate bound electron-hole pairs (excitons) in the 2D ferromagnet CrI3, and probe the subsequent charge and spin dynamics. The observed change in the optical signal during temporal pump-probe overlap represents the buildup of the exciton population. This is accompanied by the excitation of coherent optical phonon modes with 2.4 and 3.9 THz frequencies, corresponding to the bending and stretching of the Cr-I bonds. We observe both modes in the magnetism channel which agrees with first-principles calculations that identify changes in the exchange coupling due to the lattice displacements for both phonon modes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10849v1-abstract-full').style.display = 'none'; document.getElementById('2411.10849v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 November, 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">10 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/2306.10637">arXiv:2306.10637</a> <span> [<a href="https://arxiv.org/pdf/2306.10637">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"> Real-time observation of phonon-electron energy and angular momentum flow in laser-heated nickel </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Shokeen%2C+V">Vishal Shokeen</a>, <a href="/search/?searchtype=author&query=Heber%2C+M">Michael Heber</a>, <a href="/search/?searchtype=author&query=Kutnyakhov%2C+D">Dmytro Kutnyakhov</a>, <a href="/search/?searchtype=author&query=Wang%2C+X">Xiaocui Wang</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Maldonado%2C+P">Pablo Maldonado</a>, <a href="/search/?searchtype=author&query=Berritta%2C+M">Marco Berritta</a>, <a href="/search/?searchtype=author&query=Wind%2C+N">Nils Wind</a>, <a href="/search/?searchtype=author&query=Wenthaus%2C+L">Lukas Wenthaus</a>, <a href="/search/?searchtype=author&query=Pressacco%2C+F">Federico Pressacco</a>, <a href="/search/?searchtype=author&query=Min%2C+C">Chul-Hee Min</a>, <a href="/search/?searchtype=author&query=Nissen%2C+M">Matz Nissen</a>, <a href="/search/?searchtype=author&query=Mahatha%2C+S+K">Sanjoy K. Mahatha</a>, <a href="/search/?searchtype=author&query=Dziarzhytski%2C+S">Siarhei Dziarzhytski</a>, <a href="/search/?searchtype=author&query=Oppeneer%2C+P+M">Peter M. Oppeneer</a>, <a href="/search/?searchtype=author&query=Rossnagel%2C+K">Kai Rossnagel</a>, <a href="/search/?searchtype=author&query=Elmers%2C+H">Hans-Joachim Elmers</a>, <a href="/search/?searchtype=author&query=Sch%C3%B6nhense%2C+G">Gerd Sch枚nhense</a>, <a href="/search/?searchtype=author&query=D%C3%BCrr%2C+H+A">Hermann A. D眉rr</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="2306.10637v2-abstract-short" style="display: inline;"> Identifying the microscopic nature of non-equilibrium energy transfer mechanisms among electronic, spin and lattice degrees of freedom is central for understanding ultrafast phenomena such as manipulating magnetism on the femtosecond timescale. Here we use time and angle-resolved photoemission spectroscopy to go beyond the often-employed ensemble-averaged view of non-equilibrium dynamics in terms… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.10637v2-abstract-full').style.display = 'inline'; document.getElementById('2306.10637v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.10637v2-abstract-full" style="display: none;"> Identifying the microscopic nature of non-equilibrium energy transfer mechanisms among electronic, spin and lattice degrees of freedom is central for understanding ultrafast phenomena such as manipulating magnetism on the femtosecond timescale. Here we use time and angle-resolved photoemission spectroscopy to go beyond the often-employed ensemble-averaged view of non-equilibrium dynamics in terms of quasiparticle temperature evolutions. We show for ferromagnetic Ni that the non-equilibrium electron and spin dynamics display pronounced variations with electron momentum whereas the magnetic exchange interaction remains isotropic. This highlights the influence of lattice-mediated scattering processes and opens a pathway towards unraveling the still elusive microscopic mechanism of spin-lattice angular momentum transfer. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.10637v2-abstract-full').style.display = 'none'; document.getElementById('2306.10637v2-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 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 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/2305.10145">arXiv:2305.10145</a> <span> [<a href="https://arxiv.org/pdf/2305.10145">pdf</a>, <a href="https://arxiv.org/format/2305.10145">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.110.245120">10.1103/PhysRevB.110.245120 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photo-induced charge-transfer renormalization in NiO </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/?searchtype=author&query=Golez%2C+D">Denis Golez</a>, <a href="/search/?searchtype=author&query=Ollefs%2C+K">Katharina Ollefs</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=K%C3%A4mmerer%2C+L">Lea K盲mmerer</a>, <a href="/search/?searchtype=author&query=Rothenbach%2C+N">Nico Rothenbach</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P+S">Piter S. Miedema</a>, <a href="/search/?searchtype=author&query=Beye%2C+M">Martin Beye</a>, <a href="/search/?searchtype=author&query=Chiuzb%C4%83ian%2C+G+S">Gheorghe S. Chiuzb膬ian</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">Justina Schlappa</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/?searchtype=author&query=Wende%2C+H">Heiko Wende</a>, <a href="/search/?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/?searchtype=author&query=Eckstein%2C+M">Martin Eckstein</a>, <a href="/search/?searchtype=author&query=Werner%2C+P">Philipp Werner</a>, <a href="/search/?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.10145v2-abstract-short" style="display: inline;"> Photo-doped states in strongly correlated charge transfer insulators are characterized by $d$-$d$ and $d$-$p$ interactions and the resulting intertwined dynamics of charge excitations and local multiplets. Here we use femtosecond x-ray absorption spectroscopy in combination with dynamical mean-field theory to disentangle these contributions in NiO. Upon resonant optical excitation across the charg… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.10145v2-abstract-full').style.display = 'inline'; document.getElementById('2305.10145v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.10145v2-abstract-full" style="display: none;"> Photo-doped states in strongly correlated charge transfer insulators are characterized by $d$-$d$ and $d$-$p$ interactions and the resulting intertwined dynamics of charge excitations and local multiplets. Here we use femtosecond x-ray absorption spectroscopy in combination with dynamical mean-field theory to disentangle these contributions in NiO. Upon resonant optical excitation across the charge transfer gap, the Ni $L_3$ and O $K$ absorption edges red-shift for $>10$ ps, associated with photo-induced changes in the screening environment. An additional signature below the Ni $L_3$ edge is identified for $<1$ ps, reflecting a transient nonthermal population of local many-body multiplets. We employ a nonthermal generalization of the multiplet ligand field theory to show that the feature originates from $d$-$d$ transitions. Overall, the photo-doped state differs significantly from a chemically doped state. Our results demonstrate the ability to reveal excitation pathways in correlated materials by x-ray spectroscopies, which is relevant for ultrafast materials design. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.10145v2-abstract-full').style.display = 'none'; document.getElementById('2305.10145v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 110, 245120 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.08890">arXiv:2304.08890</a> <span> [<a href="https://arxiv.org/pdf/2304.08890">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="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/10.1002/advs.202302550">10.1002/advs.202302550 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transient non-collinear magnetic state for all-optical magnetization switching </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Parchenko%2C+S">Sergii Parchenko</a>, <a href="/search/?searchtype=author&query=Frej%2C+A">Antoni Frej</a>, <a href="/search/?searchtype=author&query=Ueda%2C+H">Hiroki Ueda</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">Justine Schlappa</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=Zvezdin%2C+A">Anatoly Zvezdin</a>, <a href="/search/?searchtype=author&query=Stupakiewicz%2C+A">Andrzej Stupakiewicz</a>, <a href="/search/?searchtype=author&query=Staub%2C+U">Urs Staub</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.08890v1-abstract-short" style="display: inline;"> Resonant absorption of a photon by bound electrons in a solid can promote an electron to another orbital state or transfer it to a neighboring atomic site. Such a transition in a magnetically ordered material could affect the magnetic order. While this process is an obvious road map for optical control of magnetization, experimental demonstration of such a process remains challenging. Exciting a s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.08890v1-abstract-full').style.display = 'inline'; document.getElementById('2304.08890v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.08890v1-abstract-full" style="display: none;"> Resonant absorption of a photon by bound electrons in a solid can promote an electron to another orbital state or transfer it to a neighboring atomic site. Such a transition in a magnetically ordered material could affect the magnetic order. While this process is an obvious road map for optical control of magnetization, experimental demonstration of such a process remains challenging. Exciting a significant fraction of magnetic ions requires a very intense incoming light beam, as orbital resonances are often weak compared to above-band-gap excitations. In the latter case, a sizeable reduction of the magnetization occurs as the absorbed energy increases the spin temperature, masking the non-thermal optical effects. Here, using ultrafast x-ray spectroscopy, we were able to resolve changes in the magnetization state induced by resonant absorption of infrared photons in Co-doped yttrium iron garnet, with negligible thermal effects. We found that the optical excitation of the Co ions affects the two distinct magnetic Fe sublattices differently, resulting in a transient non-collinear magnetic state. The present results indicate that the all-optical magnetization switching most likely occurs due to the creation of a transient, non-collinear magnetic state followed by coherent spin rotations of the Fe moments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.08890v1-abstract-full').style.display = 'none'; document.getElementById('2304.08890v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Adv. Sci. 10, 2302550 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.17008">arXiv:2211.17008</a> <span> [<a href="https://arxiv.org/pdf/2211.17008">pdf</a>, <a href="https://arxiv.org/format/2211.17008">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/4.0000206">10.1063/4.0000206 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Alexander%2C+O">Oliver Alexander</a>, <a href="/search/?searchtype=author&query=Atak%2C+K">Kaan Atak</a>, <a href="/search/?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/?searchtype=author&query=Buck%2C+J">Jens Buck</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Cascella%2C+M">Michele Cascella</a>, <a href="/search/?searchtype=author&query=Chardonnet%2C+V">Valentin Chardonnet</a>, <a href="/search/?searchtype=author&query=Chiuzbaian%2C+G+S">Gheorghe Sorin Chiuzbaian</a>, <a href="/search/?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Humphries%2C+O+S">Oliver S. Humphries</a>, <a href="/search/?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/?searchtype=author&query=Jal%2C+E">Emmanuelle Jal</a>, <a href="/search/?searchtype=author&query=Kubec%2C+A">Adam Kubec</a>, <a href="/search/?searchtype=author&query=Laarmann%2C+T">Tim Laarmann</a>, <a href="/search/?searchtype=author&query=Lambert%2C+C">Charles-Henri Lambert</a>, <a href="/search/?searchtype=author&query=L%C3%BCning%2C+J">Jan L眉ning</a>, <a href="/search/?searchtype=author&query=Marangos%2C+J+P">Jonathan P. Marangos</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a> , et al. (18 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.17008v1-abstract-short" style="display: inline;"> The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.17008v1-abstract-full').style.display = 'inline'; document.getElementById('2211.17008v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.17008v1-abstract-full" style="display: none;"> The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are described with a predictive rate model for electron population dynamics during the pulse, utilizing a fixed density of states and tabulated ground-state properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.17008v1-abstract-full').style.display = 'none'; document.getElementById('2211.17008v1-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 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">The main text contains 5 pages and 4 figures, the total length including supplement is 14 pages, 7 figures and one table. See also the simultaneously submitted paper about the rate model</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.04265">arXiv:2211.04265</a> <span> [<a href="https://arxiv.org/pdf/2211.04265">pdf</a>, <a href="https://arxiv.org/format/2211.04265">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1107/S1600577523000619">10.1107/S1600577523000619 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photon shot-noise limited transient absorption soft X-ray spectroscopy at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a>, <a href="/search/?searchtype=author&query=Beye%2C+M">Martin Beye</a>, <a href="/search/?searchtype=author&query=Schlotter%2C+W">William Schlotter</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=Carinan%2C+C">Cammille Carinan</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/?searchtype=author&query=Buck%2C+J">Jens Buck</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=D%27Elia%2C+A">Alessandro D'Elia</a>, <a href="/search/?searchtype=author&query=Delitz%2C+J">Jan-Torben Delitz</a>, <a href="/search/?searchtype=author&query=Ehsan%2C+W">Wajid Ehsan</a>, <a href="/search/?searchtype=author&query=Engel%2C+R">Robin Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fischer%2C+P">Peter Fischer</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=F%C3%B6hlisch%2C+A">Alexander F枚hlisch</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Gensch%2C+M">Michael Gensch</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a> , et al. (39 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.04265v3-abstract-short" style="display: inline;"> Femtosecond transient soft X-ray Absorption Spectroscopy (XAS) is a very promising technique that can be employed at X-ray Free Electron Lasers (FELs) to investigate out-of-equilibrium dynamics for material and energy research. Here we present a dedicated setup for soft X-rays available at the Spectroscopy & Coherent Scattering (SCS) instrument at the European X-ray Free Electron Laser (EuXFEL). I… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.04265v3-abstract-full').style.display = 'inline'; document.getElementById('2211.04265v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.04265v3-abstract-full" style="display: none;"> Femtosecond transient soft X-ray Absorption Spectroscopy (XAS) is a very promising technique that can be employed at X-ray Free Electron Lasers (FELs) to investigate out-of-equilibrium dynamics for material and energy research. Here we present a dedicated setup for soft X-rays available at the Spectroscopy & Coherent Scattering (SCS) instrument at the European X-ray Free Electron Laser (EuXFEL). It consists of a beam-splitting off-axis zone plate (BOZ) used in transmission to create three copies of the incoming beam, which are used to measure the transmitted intensity through the excited and unexcited sample, as well as to monitor the incoming intensity. Since these three intensity signals are detected shot-by-shot and simultaneously, this setup allows normalized shot-by-shot analysis of the transmission. For photon detection, the DSSC imaging detector, which is capable of recording up to 800 images at 4.5 MHz frame rate during the FEL burst, is employed and allows approaching the photon shot-noise limit. We review the setup and its capabilities, as well as the online and offline analysis tools provided to users. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.04265v3-abstract-full').style.display = 'none'; document.getElementById('2211.04265v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Synchrotron Rad. (2023). 30, 284-300 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.13162">arXiv:2210.13162</a> <span> [<a href="https://arxiv.org/pdf/2210.13162">pdf</a>, <a href="https://arxiv.org/format/2210.13162">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1080/21663831.2023.2210606">10.1080/21663831.2023.2210606 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/?searchtype=author&query=Elhanoty%2C+M+F">Mohamed F. Elhanoty</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Gr%C3%A5n%C3%A4s%2C+O">Oscar Gr氓n盲s</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/?searchtype=author&query=Deiter%2C+C">Carsten Deiter</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=Fischer%2C+P">Peter Fischer</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/?searchtype=author&query=Hansen%2C+K">Karsten Hansen</a>, <a href="/search/?searchtype=author&query=Hauf%2C+S">Steffen Hauf</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Kvashnin%2C+Y">Yaroslav Kvashnin</a> , et al. (26 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.13162v1-abstract-short" style="display: inline;"> The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. The interplay between the respective terms of the Hamiltonian is of fundamental interest, since it produces most, if not all, of the exotic phenomena observed in the solid state. By combining high energy and temp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.13162v1-abstract-full').style.display = 'inline'; document.getElementById('2210.13162v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.13162v1-abstract-full" style="display: none;"> The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. The interplay between the respective terms of the Hamiltonian is of fundamental interest, since it produces most, if not all, of the exotic phenomena observed in the solid state. By combining high energy and temporal resolution in femtosecond time-resolved X-ray absorption spectroscopy with ab initio time-dependent density functional theory we analyze the electronic structure in fcc Ni on the time scale of these interactions in a pump-probe experiment. We distinguish transient broadening and energy shifts in the absorption spectra, which we demonstrate to be caused by electron repopulation and correlation-induced modifications of the electronic structure, respectively. Importantly, the theoretical description of this experimental result hence requires to take the local Coulomb interaction into account, revealing a temporal interplay between band formation, exchange interaction, and Coulomb repulsion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.13162v1-abstract-full').style.display = 'none'; document.getElementById('2210.13162v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Materials Research Letters 11, 655-661 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.08729">arXiv:2206.08729</a> <span> [<a href="https://arxiv.org/pdf/2206.08729">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Monochromatic operation of the SASE3 soft X-ray beamline at European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=La+Civita%2C+D">D. La Civita</a>, <a href="/search/?searchtype=author&query=Samoylova%2C+L">L. Samoylova</a>, <a href="/search/?searchtype=author&query=Vannoni%2C+M">M. Vannoni</a>, <a href="/search/?searchtype=author&query=Villanueva%2C+R">R. Villanueva</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">D. Hickin</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">R. Carley</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B">B. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P">P. Miedema</a>, <a href="/search/?searchtype=author&query=Guyarder%2C+L+L">L. Le Guyarder</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">L. Mercadier</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">J. Schlappa</a>, <a href="/search/?searchtype=author&query=Teichman%2C+M">M. Teichman</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">A. Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Sinn%2C+H">H. Sinn</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">A. Scherz</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="2206.08729v1-abstract-short" style="display: inline;"> The SASE3 soft X-ray beamline at the European XFEL has been designed and built to provide experiments with pink or monochromatic beam in the photon energy range 250 eV - 3000 eV. Here, we focus on the monochromatic operation of the SASE3 beamline and report on design and performance of the SASE3 grating monochromator. The unique capability of an FEL source to produce short femtosecond pulses of hi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.08729v1-abstract-full').style.display = 'inline'; document.getElementById('2206.08729v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.08729v1-abstract-full" style="display: none;"> The SASE3 soft X-ray beamline at the European XFEL has been designed and built to provide experiments with pink or monochromatic beam in the photon energy range 250 eV - 3000 eV. Here, we focus on the monochromatic operation of the SASE3 beamline and report on design and performance of the SASE3 grating monochromator. The unique capability of an FEL source to produce short femtosecond pulses of high degree of coherence challenges the monochromator design by a demand to control both photon energy and temporal resolution. The aim to transport close to transform-limited pulses poses very high demands on the optics quality, in particular on the grating. The current realization of the SASE3 monochromator is discussed in comparison with optimal design performance. Presently, the monochromator operates with two gratings: the low-resolution grating is optimized for time-resolved experiments and allows for moderate resolving power of about 2000 - 5000 along with pulse stretching of few to few tens of femtoseconds RMS, and the high-resolution grating reaches resolving power of 10000 at a cost of larger pulse stretching. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.08729v1-abstract-full').style.display = 'none'; document.getElementById('2206.08729v1-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 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.06350">arXiv:2201.06350</a> <span> [<a href="https://arxiv.org/pdf/2201.06350">pdf</a>, <a href="https://arxiv.org/format/2201.06350">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="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1107/S1600577522008414">10.1107/S1600577522008414 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Megahertz-rate Ultrafast X-ray Scattering and Holographic Imaging at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Hagstr%C3%B6m%2C+N+Z">Nanna Zhou Hagstr枚m</a>, <a href="/search/?searchtype=author&query=Schneider%2C+M">Michael Schneider</a>, <a href="/search/?searchtype=author&query=Kerber%2C+N">Nico Kerber</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Parra%2C+E+B">Erick Burgos Parra</a>, <a href="/search/?searchtype=author&query=Beg%2C+M">Marijan Beg</a>, <a href="/search/?searchtype=author&query=Lang%2C+M">Martin Lang</a>, <a href="/search/?searchtype=author&query=G%C3%BCnther%2C+C+M">Christian M. G眉nther</a>, <a href="/search/?searchtype=author&query=Seng%2C+B">Boris Seng</a>, <a href="/search/?searchtype=author&query=Kammerbauer%2C+F">Fabian Kammerbauer</a>, <a href="/search/?searchtype=author&query=Popescu%2C+H">Horia Popescu</a>, <a href="/search/?searchtype=author&query=Pancaldi%2C+M">Matteo Pancaldi</a>, <a href="/search/?searchtype=author&query=Neeraj%2C+K">Kumar Neeraj</a>, <a href="/search/?searchtype=author&query=Polley%2C+D">Debanjan Polley</a>, <a href="/search/?searchtype=author&query=Jangid%2C+R">Rahul Jangid</a>, <a href="/search/?searchtype=author&query=Hrkac%2C+S+B">Stjepan B. Hrkac</a>, <a href="/search/?searchtype=author&query=Patel%2C+S+K+K">Sheena K. K. Patel</a>, <a href="/search/?searchtype=author&query=Ovcharenko%2C+S">Sergei Ovcharenko</a>, <a href="/search/?searchtype=author&query=Turenne%2C+D">Diego Turenne</a>, <a href="/search/?searchtype=author&query=Ksenzov%2C+D">Dmitriy Ksenzov</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Pronin%2C+I">Igor Pronin</a>, <a href="/search/?searchtype=author&query=Baidakova%2C+M">Marina Baidakova</a>, <a href="/search/?searchtype=author&query=Schmising%2C+C+v+K">Clemens von Korff Schmising</a>, <a href="/search/?searchtype=author&query=Borchert%2C+M">Martin Borchert</a> , et al. (75 additional authors not shown) </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="2201.06350v2-abstract-short" style="display: inline;"> The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers access to X-rays with unprecedented brightness, coherence, and pulse duration. All XFEL facilities built until recently provided X-ray pulses at a relatively low repetition rate, with limited data statistics. Here, we presen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.06350v2-abstract-full').style.display = 'inline'; document.getElementById('2201.06350v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.06350v2-abstract-full" style="display: none;"> The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers access to X-rays with unprecedented brightness, coherence, and pulse duration. All XFEL facilities built until recently provided X-ray pulses at a relatively low repetition rate, with limited data statistics. Here, we present the results from the first megahertz repetition rate X-ray scattering experiments at the Spectroscopy and Coherent Scattering (SCS) instrument of the European XFEL. We illustrate the experimental capabilities that the SCS instrument offers, resulting from the operation at MHz repetition rates and the availability of the novel DSSC 2D imaging detector. Time-resolved magnetic X-ray scattering and holographic imaging experiments in solid state samples were chosen as representative, providing an ideal test-bed for operation at megahertz rates. Our results are relevant and applicable to any other non-destructive XFEL experiments in the soft X-ray range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.06350v2-abstract-full').style.display = 'none'; document.getElementById('2201.06350v2-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 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 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">13 pages, 5 figures. Supplementary Information as ancillary file</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Synchrotron Rad. (2022), 29 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.03280">arXiv:2201.03280</a> <span> [<a href="https://arxiv.org/pdf/2201.03280">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/10.1039/D2FD00005A">10.1039/D2FD00005A <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ultrafast manipulation of the NiO antiferromagnetic order via sub-gap optical excitation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Wang%2C+X">Xiaocui Wang</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Vaskivskyi%2C+I">Igor Vaskivskyi</a>, <a href="/search/?searchtype=author&query=Turenne%2C+D">Diego Turenne</a>, <a href="/search/?searchtype=author&query=Shokeen%2C+V">Vishal Shokeen</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Gr%C3%A5n%C3%A4s%2C+O">Oscar Gr氓n盲s</a>, <a href="/search/?searchtype=author&query=Knut%2C+R">Ronny Knut</a>, <a href="/search/?searchtype=author&query=Schunck%2C+J+O">Jan O. Schunck</a>, <a href="/search/?searchtype=author&query=Dziarzhytski%2C+S">Siarhei Dziarzhytski</a>, <a href="/search/?searchtype=author&query=Brenner%2C+G">G眉nter Brenner</a>, <a href="/search/?searchtype=author&query=Wang%2C+R">Ru-Pan Wang</a>, <a href="/search/?searchtype=author&query=Kuhlmann%2C+M">Marion Kuhlmann</a>, <a href="/search/?searchtype=author&query=Kuschewski%2C+F">Frederik Kuschewski</a>, <a href="/search/?searchtype=author&query=Bronsch%2C+W">Wibke Bronsch</a>, <a href="/search/?searchtype=author&query=Sch%C3%BC%C3%9Fler-Langeheine%2C+C">Christian Sch眉脽ler-Langeheine</a>, <a href="/search/?searchtype=author&query=Styervoyedov%2C+A">Andriy Styervoyedov</a>, <a href="/search/?searchtype=author&query=Parkin%2C+S+S+P">Stuart S. P. Parkin</a>, <a href="/search/?searchtype=author&query=Parmigiani%2C+F">Fulvio Parmigiani</a>, <a href="/search/?searchtype=author&query=Eriksson%2C+O">Olle Eriksson</a>, <a href="/search/?searchtype=author&query=Beye%2C+M">Martin Beye</a>, <a href="/search/?searchtype=author&query=D%C3%BCrr%2C+H+A">Hermann A. D眉rr</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="2201.03280v1-abstract-short" style="display: inline;"> Wide-band-gap insulators such as NiO offer the exciting prospect of coherently manipulating electronic correlations with strong optical fields. Contrary to metals where rapid dephasing of optical excitation via electronic processes occurs, the sub-gap excitation in charge-transfer insulators has been shown to couple to low-energy bosonic excitations. However, it is currently unknown if the bosonic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.03280v1-abstract-full').style.display = 'inline'; document.getElementById('2201.03280v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.03280v1-abstract-full" style="display: none;"> Wide-band-gap insulators such as NiO offer the exciting prospect of coherently manipulating electronic correlations with strong optical fields. Contrary to metals where rapid dephasing of optical excitation via electronic processes occurs, the sub-gap excitation in charge-transfer insulators has been shown to couple to low-energy bosonic excitations. However, it is currently unknown if the bosonic dressing field is composed of phonons or magnons. Here we use the prototypical charge-transfer insulator NiO to demonstrate that 1.5 eV sub-gap optical excitation leads to a renormalised NiO band-gap in combination with a significant reduction of the antiferromagnetic order. We employ element-specific X-ray reflectivity at the FLASH free-electron laser to demonstrate the reduction of the upper band-edge at the O 1s-2p core-valence resonance (K-edge) whereas the antiferromagnetic order is probed via X-ray magnetic linear dichroism (XMLD) at the Ni 2p-3d resonance (L2-edge). Comparing the transient XMLD spectral line shape to ground-state measurements allows us to extract a spin temperature rise of 65 +/- 5 K for time delays longer than 400 fs while at earlier times a non-equilibrium spin state is formed. We identify transient mid-gap states being formed during the first 200 fs accompanied by a band-gap reduction lasting at least up to the maximum measured time delay of 2.4 ps. Electronic structure calculations indicate that magnon excitations significantly contribute to the reduction of the NiO band gap. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.03280v1-abstract-full').style.display = 'none'; document.getElementById('2201.03280v1-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 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.01649">arXiv:2111.01649</a> <span> [<a href="https://arxiv.org/pdf/2111.01649">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"> Non-equilibrium self-assembly of spin-wave solitons in FePt nanoparticles </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Turenne%2C+D">D. Turenne</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">A. Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Wang%2C+X">X. Wang</a>, <a href="/search/?searchtype=author&query=Unikandanuni%2C+V">V. Unikandanuni</a>, <a href="/search/?searchtype=author&query=Vaskivskyi%2C+I">I. Vaskivskyi</a>, <a href="/search/?searchtype=author&query=Schneider%2C+M">M. Schneider</a>, <a href="/search/?searchtype=author&query=Jal%2C+E">E. Jal</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">R. Carley</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">N. Agarwal</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B">B. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">L. Mercadier</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">J. Schlappa</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">L. Le Guyader</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">M. Teichmann</a>, <a href="/search/?searchtype=author&query=Lomidze%2C+D">D. Lomidze</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">A. Castoldi</a>, <a href="/search/?searchtype=author&query=Potorochin%2C+D">D. Potorochin</a>, <a href="/search/?searchtype=author&query=Mukkattukavil%2C+D">D. Mukkattukavil</a>, <a href="/search/?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/?searchtype=author&query=Hagstr%C3%B6m%2C+N+Z">N. Z. Hagstr枚m</a>, <a href="/search/?searchtype=author&query=Reid%2C+A+H">A. H. Reid</a>, <a href="/search/?searchtype=author&query=Shen%2C+X">X. Shen</a> , et al. (14 additional authors not shown) </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="2111.01649v1-abstract-short" style="display: inline;"> Magnetic nanoparticles such as FePt in the L10-phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magneto-crystalline anisotropy. This in turn reduces the magnetic exchange length to just a few nanometers enabling magnetic structures to be induced within the na… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.01649v1-abstract-full').style.display = 'inline'; document.getElementById('2111.01649v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.01649v1-abstract-full" style="display: none;"> Magnetic nanoparticles such as FePt in the L10-phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magneto-crystalline anisotropy. This in turn reduces the magnetic exchange length to just a few nanometers enabling magnetic structures to be induced within the nanoparticles. Here we describe the existence of spin-wave solitons, dynamic localized bound states of spin-wave excitations, in FePt nanoparticles. We show with time-resolved X-ray diffraction and micromagnetic modeling that spin-wave solitons of sub-10 nm sizes form out of the demagnetized state following femtosecond laser excitation. The measured soliton spin-precession frequency of 0.1 THz positions this system as a platform to develop miniature devices capable of filling the THz gap. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.01649v1-abstract-full').style.display = 'none'; document.getElementById('2111.01649v1-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 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">32 pages, please check the "attachemnts" tab in the pdf file in order to see the movie</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.09999">arXiv:2106.09999</a> <span> [<a href="https://arxiv.org/pdf/2106.09999">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"> Optical control of 4f orbital state in rare-earth metals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Thielemann-K%C3%BChn%2C+N">N. Thielemann-K眉hn</a>, <a href="/search/?searchtype=author&query=Amrhein%2C+T">T. Amrhein</a>, <a href="/search/?searchtype=author&query=Bronsch%2C+W">W. Bronsch</a>, <a href="/search/?searchtype=author&query=Jana%2C+S">S. Jana</a>, <a href="/search/?searchtype=author&query=Pontius%2C+N">N. Pontius</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">R. Y. Engel</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P+S">P. S. Miedema</a>, <a href="/search/?searchtype=author&query=Legut%2C+D">D. Legut</a>, <a href="/search/?searchtype=author&query=Carva%2C+K">K. Carva</a>, <a href="/search/?searchtype=author&query=Atxitia%2C+U">U. Atxitia</a>, <a href="/search/?searchtype=author&query=van+Kuiken%2C+B+E">B. E. van Kuiken</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">M. Teichmann</a>, <a href="/search/?searchtype=author&query=Carley%2C+R+E">R. E. Carley</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">L. Mercadier</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">A. Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">L. Le Guyader</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">N. Agarwal</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">A. Scherz</a>, <a href="/search/?searchtype=author&query=Dziarzhytski%2C+S">S. Dziarzhytski</a>, <a href="/search/?searchtype=author&query=Brenner%2C+G">G. Brenner</a>, <a href="/search/?searchtype=author&query=Pressacco%2C+F">F. Pressacco</a>, <a href="/search/?searchtype=author&query=Wang%2C+R">R. Wang</a>, <a href="/search/?searchtype=author&query=Schunck%2C+J+O">J. O. Schunck</a> , et al. (6 additional authors not shown) </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="2106.09999v4-abstract-short" style="display: inline;"> A change of orbital state alters the coupling between ions and their surroundings drastically. Orbital excitations are hence key to understand and control interaction of ions. Rare-earth (RE) elements with strong magneto-crystalline anisotropy (MCA) are important ingredients for magnetic devices. Thus, control of their localized 4f magnetic moments and anisotropy is one major challenge in ultrafas… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.09999v4-abstract-full').style.display = 'inline'; document.getElementById('2106.09999v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.09999v4-abstract-full" style="display: none;"> A change of orbital state alters the coupling between ions and their surroundings drastically. Orbital excitations are hence key to understand and control interaction of ions. Rare-earth (RE) elements with strong magneto-crystalline anisotropy (MCA) are important ingredients for magnetic devices. Thus, control of their localized 4f magnetic moments and anisotropy is one major challenge in ultrafast spin physics. With time-resolved X-ray absorption and resonant inelastic scattering experiments, we show for Tb metal that 4f-electronic excitations out of the ground state multiplet occur after optical pumping. These excitations are driven by inelastic 5d-4f-electron scattering, alter the 4f-orbital state and consequently the MCA with important implications for magnetization dynamics in 4f-metals, and more general for the excitation of localized electronic states in correlated materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.09999v4-abstract-full').style.display = 'none'; document.getElementById('2106.09999v4-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 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">Manuscript (23 pages, 5 figures) and Supplementary Information (32 pages, 10 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/2104.11136">arXiv:2104.11136</a> <span> [<a href="https://arxiv.org/pdf/2104.11136">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> High spatial coherence and short pulse duration revealed by the Hanbury Brown and Twiss interferometry at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Khubbutdinov%2C+R">Ruslan Khubbutdinov</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Assalauova%2C+D">Dameli Assalauova</a>, <a href="/search/?searchtype=author&query=Carnis%2C+J">Jerome Carnis</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+l">Lo茂c le Guyader</a>, <a href="/search/?searchtype=author&query=Ignatenko%2C+A">Alexandr Ignatenko</a>, <a href="/search/?searchtype=author&query=Kim%2C+Y+Y">Young Yong Kim</a>, <a href="/search/?searchtype=author&query=van+Kuiken%2C+B">Benjamin van Kuiken</a>, <a href="/search/?searchtype=author&query=Kurta%2C+R+P">Ruslan P. Kurta</a>, <a href="/search/?searchtype=author&query=Lapkin%2C+D">Dmitry Lapkin</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">Martin Teichmann</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Gorobtsov%2C+O">Oleg Gorobtsov</a>, <a href="/search/?searchtype=author&query=Menushenkov%2C+A+P">Aleksey P. Menushenkov</a>, <a href="/search/?searchtype=author&query=Scholz%2C+M">Matthias Scholz</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">Ivan A. Vartanyants</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="2104.11136v1-abstract-short" style="display: inline;"> Second-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft X-ray SASE3 undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode. Two high-power regimes of the SASE3 undulator settings, i.e. linear and quadratic tapering at s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.11136v1-abstract-full').style.display = 'inline'; document.getElementById('2104.11136v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.11136v1-abstract-full" style="display: none;"> Second-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft X-ray SASE3 undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode. Two high-power regimes of the SASE3 undulator settings, i.e. linear and quadratic tapering at saturation, were studied in detail and compared with the linear gain regime. The statistical analysis showed an exceptionally high degree of spatial coherence up to 90% for the linear undulator tapering. Analysis of the measured data in spectral and spatial domains provided an average pulse duration of about 10 fs in our measurements. The obtained results will be valuable for the experiments requiring and exploiting short pulse duration and utilizing high coherence properties of the EuXFEL. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.11136v1-abstract-full').style.display = 'none'; document.getElementById('2104.11136v1-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 April, 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">12 pages, 6 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.04687">arXiv:1608.04687</a> <span> [<a href="https://arxiv.org/pdf/1608.04687">pdf</a>, <a href="https://arxiv.org/ps/1608.04687">ps</a>, <a href="https://arxiv.org/format/1608.04687">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.94.195101">10.1103/PhysRevB.94.195101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Europium mixed-valence, long-range magnetic order, and dynamic magnetic response in EuCu$_{2}$(Si$_{x}$Ge$_{1-x}$)$_{2}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Nemkovski%2C+K+S">Kirill S. Nemkovski</a>, <a href="/search/?searchtype=author&query=Kozlenko%2C+D+P">Denis P. Kozlenko</a>, <a href="/search/?searchtype=author&query=Alekseev%2C+P+A">Pavel A. Alekseev</a>, <a href="/search/?searchtype=author&query=Mignot%2C+J">Jean-Michel Mignot</a>, <a href="/search/?searchtype=author&query=Menushenkov%2C+A+P">Alexey P. Menushenkov</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A+A">Alexander A. Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Clementyev%2C+E+S">Evgeny S. Clementyev</a>, <a href="/search/?searchtype=author&query=Ivanov%2C+A+S">Alexandre S. Ivanov</a>, <a href="/search/?searchtype=author&query=Rols%2C+S">St茅phane Rols</a>, <a href="/search/?searchtype=author&query=Klobes%2C+B">Benedikt Klobes</a>, <a href="/search/?searchtype=author&query=Hermann%2C+R+P">Rapha毛l P. Hermann</a>, <a href="/search/?searchtype=author&query=Gribanov%2C+A+V">Alexander V. Gribanov</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="1608.04687v2-abstract-short" style="display: inline;"> In mixed-valence or heavy-fermion systems, the hybridization between local $f$ orbitals and conduction band states can cause the suppression of long-range magnetic order, which competes with strong spin fluctuations. Ce- and Yb-based systems have been found to exhibit fascinating physical properties (heavy-fermion superconductivity, non-Fermi-liquid states, etc.) when tuned to the vicinity of magn… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.04687v2-abstract-full').style.display = 'inline'; document.getElementById('1608.04687v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.04687v2-abstract-full" style="display: none;"> In mixed-valence or heavy-fermion systems, the hybridization between local $f$ orbitals and conduction band states can cause the suppression of long-range magnetic order, which competes with strong spin fluctuations. Ce- and Yb-based systems have been found to exhibit fascinating physical properties (heavy-fermion superconductivity, non-Fermi-liquid states, etc.) when tuned to the vicinity of magnetic quantum critical points by use of various external control parameters (temperature, magnetic field, chemical composition). Recently, similar effects (mixed-valence, Kondo fluctuations, heavy Fermi liquid) have been reported to exist in some Eu-based compounds. Unlike Ce (Yb), Eu has a multiple electron (hole) occupancy of its $4f$ shell, and the magnetic Eu$^{2+}$ state ($4f^7$) has no orbital component in the usual $LS$ coupling scheme, which can lead to a quite different and interesting physics. In the EuCu$_{2}$(Si$_{x}$Ge$_{1-x}$)$_{2}$ series, where the valence can be tuned by varying the Si/Ge ratio, it has been reported that a significant valence fluctuation can exist even in the magnetic order regime. This paper presents a detailed study of the latter material using different microscopic probes (XANES, M枚ssbauer spectroscopy, elastic and inelastic neutron scattering), in which the composition dependence of the magnetic order and dynamics across the series is traced back to the change in the Eu valence state. In particular, the results support the persistence of valence fluctuations into the antiferromagnetic state over a sizable composition range below the critical Si concentration $x_c \approx 0.65$. The sequence of magnetic ground states in the series is shown to reflect the evolution of the magnetic spectral response. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.04687v2-abstract-full').style.display = 'none'; document.getElementById('1608.04687v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 94, 195101 (2016) </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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