Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2

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dc.citation.firstpage180504(R)en_US
dc.citation.issueNumber18en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber92en_US
dc.contributor.authorSong, Yuen_US
dc.contributor.authorLu, Xingyeen_US
dc.contributor.authorAbernathy, D.L.en_US
dc.contributor.authorTam, David W.en_US
dc.contributor.authorNiedziela, J.L.en_US
dc.contributor.authorTian, Weien_US
dc.contributor.authorLuo, Huiqianen_US
dc.contributor.authorSi, Qimiaoen_US
dc.contributor.authorDai, Pengchengen_US
dc.date.accessioned2016-01-15T19:47:52Zen_US
dc.date.available2016-01-15T19:47:52Zen_US
dc.date.issued2015en_US
dc.description.abstractWe use inelastic neutron scattering to study the temperature and energy dependence of the spin excitation anisotropy in uniaxial-strained electron-doped iron pnictide BaFe1.9Ni0.1As2 near optimal superconductivity (Tc=20K). Our work has been motivated by the observation of in-plane resistivity anisotropy in the paramagnetic tetragonal phase of electron-underdoped iron pnictides under uniaxial pressure, which has been attributed to a spin-driven Ising-nematic state or orbital ordering. Here we show that the spin excitation anisotropy, a signature of the spin-driven Ising-nematic phase, exists for energies below ∼60 meV in uniaxial-strained BaFe1.9Ni0.1As2. Since this energy scale is considerably larger than the energy splitting of the dxz and dyz bands of uniaxial-strained Ba(Fe1−xCox)2As2 near optimal superconductivity, spin Ising-nematic correlations are likely the driving force for the resistivity anisotropy and associated electronic nematic correlations.en_US
dc.identifier.citationSong, Yu, Lu, Xingye, Abernathy, D.L., et al.. "Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2." <i>Physical Review B,</i> 92, no. 18 (2015) American Physical Society: 180504(R). http://dx.doi.org/10.1103/PhysRevB.92.180504.en_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.92.180504en_US
dc.identifier.urihttps://hdl.handle.net/1911/87852en_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.titleEnergy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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