Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2As2

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dc.citation.articleNumber020404(R)en_US
dc.citation.issueNumber2en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber96en_US
dc.contributor.authorLi, Yuen_US
dc.contributor.authorWang, Weiyien_US
dc.contributor.authorSong, Yuen_US
dc.contributor.authorMan, Haoranen_US
dc.contributor.authorLu, Xingyeen_US
dc.contributor.authorBourdarot, Frédéricen_US
dc.contributor.authorDai, Pengchengen_US
dc.date.accessioned2017-08-09T17:13:27Zen_US
dc.date.available2017-08-09T17:13:27Zen_US
dc.date.issued2017en_US
dc.description.abstractWe use neutron polarization analysis to study temperature dependence of the spin excitation anisotropy in BaFe 2 As 2 , which has a tetragonal-to-orthorhombic structural distortion at T s and antiferromagnetic (AF) phase transition at T N with ordered moments along the orthorhombic a axis below T s ≈ T N ≈ 136 K. In the paramagnetic tetragonal state at 160 K, spin excitations are isotropic in spin space with M a = M b = M c , where M a , M b , and M c are spin excitations polarized along the a -, b -, and c -axis directions of the orthorhombic lattice, respectively. On cooling towards T N , significant spin excitation anisotropy with M a > M b ≈ M c develops below 3 meV with a diverging M a at T N . The in-plane spin excitation anisotropy in the tetragonal phase of BaFe 2 As 2 is similar to those seen in the tetragonal phase of its electron and hole-doped superconductors, suggesting that spin excitation anisotropy is a direct probe of doping dependence of spin-orbit coupling and its connection to superconductivity in iron pnictides.en_US
dc.identifier.citationLi, Yu, Wang, Weiyi, Song, Yu, et al.. "Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2As2." <i>Physical Review B,</i> 96, no. 2 (2017) American Physical Society: https://doi.org/10.1103/PhysRevB.96.020404.en_US
dc.identifier.digitalSpin_excitation_anisotropyen_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.96.020404en_US
dc.identifier.urihttps://hdl.handle.net/1911/96639en_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 excitation anisotropy in the paramagnetic tetragonal phase of BaFe2As2en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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