Electron doping evolution of the magnetic excitations in NaFe1−xCoxAs

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dc.citation.articleNumber214506en_US
dc.citation.issueNumber21en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber93en_US
dc.contributor.authorCarr, Scott V.en_US
dc.contributor.authorZhang, Chenglinen_US
dc.contributor.authorSong, Yuen_US
dc.contributor.authorTan, Guotaien_US
dc.contributor.authorLi, Yuen_US
dc.contributor.authorAbernathy, D.L.en_US
dc.contributor.authorStone, M.B.en_US
dc.contributor.authorGranroth, G.E.en_US
dc.contributor.authorPerring, T.G.en_US
dc.contributor.authorDai, Pengchengen_US
dc.date.accessioned2017-08-21T14:34:15Zen_US
dc.date.available2017-08-21T14:34:15Zen_US
dc.date.issued2016en_US
dc.description.abstractWe use time-of-flight (TOF) inelastic-neutron-scattering (INS) spectroscopy to investigate the doping dependence of magnetic excitations across the phase diagram of NaFe 1 − x Co x As with x = 0 , 0.0175, 0.0215, 0.05, and 0.11 . The effect of electron doping by partially substituting Fe by Co is to form resonances that couple with superconductivity, broaden, and suppress low-energy ( E ≤ 80 meV) spin excitations compared with spin waves in undoped NaFeAs. However, high-energy ( E > 80 meV) spin excitations are weakly Co-doping-dependent. Integration of the local spin dynamic susceptibility χ ' ' ( ω ) of NaFe 1 − x Co x As reveals a total fluctuating moment of 3.6 μ 2 B /Fe and a small but systematic reduction with electron doping. The presence of a large spin gap in Co-overdoped nonsuperconducting NaFe 0.89 Co 0.11 As suggests that Fermi surface nesting is responsible for low-energy spin excitations. These results parallel the Ni-doping evolution of spin excitations in BaFe 2 − x Ni x As 2 in spite of the differences in crystal structures and Fermi surface evolution in these two families of iron pnictides, thus confirming the notion that low-energy spin excitations coupling with itinerant electrons are important for superconductivity, while weakly doping-dependent high-energy spin excitations result from localized moments.en_US
dc.identifier.citationCarr, Scott V., Zhang, Chenglin, Song, Yu, et al.. "Electron doping evolution of the magnetic excitations in NaFe1−xCoxAs." <i>Physical Review B,</i> 93, no. 21 (2016) American Physical Society: https://doi.org/10.1103/PhysRevB.93.214506.en_US
dc.identifier.digitalElectron_doping_evolutionen_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.93.214506en_US
dc.identifier.urihttps://hdl.handle.net/1911/97370en_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.titleElectron doping evolution of the magnetic excitations in NaFe1−xCoxAsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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