Spin excitations in metallic kagome lattice FeSn and CoSn

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dc.citation.articleNumber240en_US
dc.citation.journalTitleCommunications Physicsen_US
dc.citation.volumeNumber4en_US
dc.contributor.authorXie, Yaofengen_US
dc.contributor.authorChen, Lebingen_US
dc.contributor.authorChen, Tongen_US
dc.contributor.authorWang, Qien_US
dc.contributor.authorYin, Qiangweien_US
dc.contributor.authorStewart, J. Rossen_US
dc.contributor.authorStone, Matthew B.en_US
dc.contributor.authorDaemen, Luke L.en_US
dc.contributor.authorFeng, Erxien_US
dc.contributor.authorCao, Huiboen_US
dc.contributor.authorLei, Hechangen_US
dc.contributor.authorYin, Zhipingen_US
dc.contributor.authorMacDonald, Allan H.en_US
dc.contributor.authorDai, Pengchengen_US
dc.date.accessioned2021-12-02T15:09:30Zen_US
dc.date.available2021-12-02T15:09:30Zen_US
dc.date.issued2021en_US
dc.description.abstractIn two-dimensional (2D) metallic kagome lattice materials, destructive interference of electronic hopping pathways around the kagome bracket can produce nearly localized electrons, and thus electronic bands that are flat in momentum space. When ferromagnetic order breaks the degeneracy of the electronic bands and splits them into the spin-up majority and spin-down minority electronic bands, quasiparticle excitations between the spin-up and spin-down flat bands should form a narrow localized spin-excitation Stoner continuum coexisting with well-defined spin waves in the long wavelengths. Here we report inelastic neutron scattering studies of spin excitations in 2D metallic kagome lattice antiferromagnetic FeSn and paramagnetic CoSn, where angle resolved photoemission spectroscopy experiments found spin-polarized and nonpolarized flat bands, respectively, below the Fermi level. Our measurements on FeSn and CoSn reveal well-defined spin waves extending above 140 meV and correlated paramagnetic scattering around Γ point below 90 meV, respectively. In addition, we observed non-dispersive excitations at ~170 meV and ~360 meV arising mostly from hydrocarbon scattering of the CYTOP-M used to glue the samples to aluminum holder. Therefore, our results established the evolution of spin excitations in FeSn and CoSn, and identified anomalous flat modes overlooked by the neutron scattering community for many years.en_US
dc.identifier.citationXie, Yaofeng, Chen, Lebing, Chen, Tong, et al.. "Spin excitations in metallic kagome lattice FeSn and CoSn." <i>Communications Physics,</i> 4, (2021) Springer Nature: https://doi.org/10.1038/s42005-021-00736-8.en_US
dc.identifier.digitals42005-021-00736-8en_US
dc.identifier.doihttps://doi.org/10.1038/s42005-021-00736-8en_US
dc.identifier.urihttps://hdl.handle.net/1911/111734en_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.titleSpin excitations in metallic kagome lattice FeSn and CoSnen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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