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

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dc.citation.articleNumber060507(R)
dc.citation.issueNumber6
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber97
dc.contributor.authorMan, Haoran
dc.contributor.authorZhang, Rui
dc.contributor.authorPark, J.T.
dc.contributor.authorLu, Xingye
dc.contributor.authorKulda, J.
dc.contributor.authorIvanov, A.
dc.contributor.authorDai, Pengcheng
dc.date.accessioned2018-07-11T20:57:33Z
dc.date.available2018-07-11T20:57:33Z
dc.date.issued2018
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.
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.
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.97.060507
dc.identifier.urihttps://hdl.handle.net/1911/102412
dc.language.isoeng
dc.publisherAmerican Physical Society
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.
dc.titleDirect observation of spin excitation anisotropy in the paramagnetic orthorhombic state of BaFe2−xNixAs2
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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