High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2

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dc.citation.articleNumber60en_US
dc.citation.journalTitlenpj Quantum Materialsen_US
dc.citation.volumeNumber6en_US
dc.contributor.authorSong, Yuen_US
dc.contributor.authorWang, Weiyien_US
dc.contributor.authorCao, Chongdeen_US
dc.contributor.authorYamani, Zahraen_US
dc.contributor.authorXu, Yuanjien_US
dc.contributor.authorSheng, Yutaoen_US
dc.contributor.authorLöser, Wolfgangen_US
dc.contributor.authorQiu, Yimingen_US
dc.contributor.authorYang, Yi-fengen_US
dc.contributor.authorBirgeneau, Robert J.en_US
dc.contributor.authorDai, Pengchengen_US
dc.date.accessioned2021-07-08T13:46:07Zen_US
dc.date.available2021-07-08T13:46:07Zen_US
dc.date.issued2021en_US
dc.description.abstractMagnetic fluctuations is the leading candidate for pairing in cuprate, iron-based, and heavy fermion superconductors. This view is challenged by the recent discovery of nodeless superconductivity in CeCu2Si2, and calls for a detailed understanding of the corresponding magnetic fluctuations. Here, we mapped out the magnetic excitations in superconducting (S-type) CeCu2Si2 using inelastic neutron scattering, finding a strongly asymmetric dispersion for E ≲ 1.5 meV, which at higher energies evolves into broad columnar magnetic excitations that extend to E ≳ 5 meV. While low-energy magnetic excitations exhibit marked three-dimensional characteristics, the high-energy magnetic excitations in CeCu2Si2 are almost two-dimensional, reminiscent of paramagnons found in cuprate and iron-based superconductors. By comparing our experimental findings with calculations in the random-phase approximation,we find that the magnetic excitations in CeCu2Si2 arise from quasiparticles associated with its heavy electron band, which are also responsible for superconductivity. Our results provide a basis for understanding magnetism and superconductivity in CeCu2Si2, and demonstrate the utility of neutron scattering in probing band renormalization in heavy fermion metals.en_US
dc.identifier.citationSong, Yu, Wang, Weiyi, Cao, Chongde, et al.. "High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2." <i>npj Quantum Materials,</i> 6, (2021) Springer Nature: https://doi.org/10.1038/s41535-021-00358-x.en_US
dc.identifier.digitals41535-021-00358-xen_US
dc.identifier.doihttps://doi.org/10.1038/s41535-021-00358-xen_US
dc.identifier.urihttps://hdl.handle.net/1911/111006en_US
dc.language.isoengen_US
dc.publisherSpringer Natureen_US
dc.rightsThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleHigh-energy magnetic excitations from heavy quasiparticles in CeCu2Si2en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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