Direct observation of spin excitation anisotropy in the paramagnetic orthorhombic state of BaFe2−xNixAs2

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dc.citation.articleNumber060507(R)en_US
dc.citation.issueNumber6en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber97en_US
dc.contributor.authorMan, Haoranen_US
dc.contributor.authorZhang, Ruien_US
dc.contributor.authorPark, J.T.en_US
dc.contributor.authorLu, Xingyeen_US
dc.contributor.authorKulda, J.en_US
dc.contributor.authorIvanov, A.en_US
dc.contributor.authorDai, Pengchengen_US
dc.date.accessioned2018-07-11T20:57:33Zen_US
dc.date.available2018-07-11T20:57:33Zen_US
dc.date.issued2018en_US
dc.description.abstractWe use transport and inelastic neutron-scattering measurements to investigate single crystals of iron pnictide BaFe2−xNixAs2(x=0,0.03), which exhibit a tetragonal-to-orthorhombic structural transition at Ts and stripe antiferromagnetic order at TN(Ts≥TN). Using a tunable uniaxial pressure device, we detwin the crystals and study their transport and spin excitation properties at antiferromagnetic wave-vector S1(1,0) and its 90∘ rotated wave-vector S2(0,1) under different pressure conditions. We find that uniaxial pressure necessary to detwin and maintain the single domain orthorhombic antiferromagnetic phase of BaFe2−xNixAs2 induces resistivity and spin excitation anisotropy at temperatures above zero pressure Ts. In the uniaxial pressure-free detwinned sample, spin excitation anisotropy between S1(1,0) and S2(0,1) first appears in the paramagnetic orthorhombic phase below Ts. These results are consistent with predictions of spin nematic theory, suggesting the absence of structural or nematic phase transition above Ts in iron pnictides.en_US
dc.identifier.citationMan, Haoran, Zhang, Rui, Park, J.T., et al.. "Direct observation of spin excitation anisotropy in the paramagnetic orthorhombic state of BaFe2−xNixAs2." <i>Physical Review B,</i> 97, no. 6 (2018) American Physical Society: https://doi.org/10.1103/PhysRevB.97.060507.en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.97.060507en_US
dc.identifier.urihttps://hdl.handle.net/1911/102412en_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.titleDirect observation of spin excitation anisotropy in the paramagnetic orthorhombic state of BaFe2−xNixAs2en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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