Spin-isotropic continuum of spin excitations in antiferromagnetically orderedﾠFe1.07Te

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dc.citation.articleNumber024519en_US
dc.citation.issueNumber2en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber97en_US
dc.contributor.authorSong, Yuen_US
dc.contributor.authorLu, Xingyeen_US
dc.contributor.authorRegnault, L.-P.en_US
dc.contributor.authorSu, Yixien_US
dc.contributor.authorLai, Hsin-Huaen_US
dc.contributor.authorHu, Wen-Junen_US
dc.contributor.authorSi, Qimiaoen_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.orgRice Center for Quantum Materialsen_US
dc.date.accessioned2018-07-11T19:50:55Zen_US
dc.date.available2018-07-11T19:50:55Zen_US
dc.date.issued2018en_US
dc.description.abstractUnconventional superconductivity typically emerges in the presence of quasidegenerate ground states, and the associated intense fluctuations are likely responsible for generating the superconducting state. Here we use polarized neutron scattering to study the spin space anisotropy of spin excitations in Fe1.07Te exhibiting bicollinear antiferromagnetic (AF) order, the parent compound of FeTe1−xSexsuperconductors. We confirm that the low-energy spin excitations are transverse spin waves, consistent with a local-moment origin of the bicollinear AF order. While the ordered moments lie in the ab plane in Fe1.07Te, it takes less energy for them to fluctuate out of plane, similar to BaFe2As2 and NaFeAs. At energies above E≳20 meV, we find magnetic scattering to be dominated by an isotropic continuum that persists up to at least 50 meV. Although the isotropic spin excitations cannot be ascribed to spin waves from a long-range-ordered local-moment antiferromagnet, the continuum can result from the bicollinear magnetic order ground state of Fe1.07Te being quasidegenerate with plaquette magnetic order.en_US
dc.identifier.citationSong, Yu, Lu, Xingye, Regnault, L.-P., et al.. "Spin-isotropic continuum of spin excitations in antiferromagnetically orderedﾠFe1.07Te." <i>Physical Review B,</i> 97, no. 2 (2018) American Physical Society: https://doi.org/10.1103/PhysRevB.97.024519.en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.97.024519en_US
dc.identifier.urihttps://hdl.handle.net/1911/102401en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleSpin-isotropic continuum of spin excitations in antiferromagnetically orderedﾠFe1.07Teen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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