Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As

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dc.citation.articleNumber184512en_US
dc.citation.issueNumber18en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber96en_US
dc.contributor.authorSong, Yuen_US
dc.contributor.authorWang, Weiyien_US
dc.contributor.authorZhang, Chenglinen_US
dc.contributor.authorGu, Yanhongen_US
dc.contributor.authorLu, Xingyeen_US
dc.contributor.authorTan, Guotaien_US
dc.contributor.authorSu, Yixien_US
dc.contributor.authorBourdarot, Frédéricen_US
dc.contributor.authorChristianson, A.D.en_US
dc.contributor.authorLi, Shiliangen_US
dc.contributor.authorDai, Pengchengen_US
dc.date.accessioned2017-12-21T18:21:52Zen_US
dc.date.available2017-12-21T18:21:52Zen_US
dc.date.issued2017en_US
dc.description.abstractWe use unpolarized and polarized neutron scattering to study the temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As, with coexisting superconductivity (Tc≈19 K) and weak antiferromagnetic order (TN≈30 K, ordered moment ≈0.02μB/Fe). A single spin resonance mode with intensity tracking the superconducting order parameter is observed, although energy of the mode only softens slightly upon approaching Tc. Polarized neutron scattering reveals that the single resonance is mostly isotropic in spin space, similar to overdoped NaFe0.935Co0.045As but different from optimal electron-, hole-, and isovalently doped BaFe2As2 compounds, all featuring an additional prominent anisotropic component. Spin anisotropy in NaFe0.9785Co0.0215As is instead present at energies below the resonance, which becomes partially gapped below Tc, similar to the situation in optimally doped YBa2Cu3O6.9. Our results indicate that anisotropic spin fluctuations in NaFe1−xCoxAs appear in the form of a resonance in the underdoped regime, become partially gapped below Tc near optimal doping, and disappear in overdoped compounds.en_US
dc.identifier.citationSong, Yu, Wang, Weiyi, Zhang, Chenglin, et al.. "Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As." <i>Physical Review B,</i> 96, no. 18 (2017) American Physical Society: https://doi.org/10.1103/PhysRevB.96.184512.en_US
dc.identifier.digitalPhysRevB-96-184512en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.96.184512en_US
dc.identifier.urihttps://hdl.handle.net/1911/98915en_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.titleTemperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215Asen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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