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

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dc.citation.articleNumber184512
dc.citation.issueNumber18
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber96
dc.contributor.authorSong, Yu
dc.contributor.authorWang, Weiyi
dc.contributor.authorZhang, Chenglin
dc.contributor.authorGu, Yanhong
dc.contributor.authorLu, Xingye
dc.contributor.authorTan, Guotai
dc.contributor.authorSu, Yixi
dc.contributor.authorBourdarot, Frédéric
dc.contributor.authorChristianson, A.D.
dc.contributor.authorLi, Shiliang
dc.contributor.authorDai, Pengcheng
dc.date.accessioned2017-12-21T18:21:52Z
dc.date.available2017-12-21T18:21:52Z
dc.date.issued2017
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.
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.
dc.identifier.digitalPhysRevB-96-184512
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.96.184512
dc.identifier.urihttps://hdl.handle.net/1911/98915
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.titleTemperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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