Phase separation, competition, and volume-fraction control in NaFe1−xCoxA

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dc.citation.firstpage144502en_US
dc.citation.issueNumber14en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber90en_US
dc.contributor.authorMa, Longen_US
dc.contributor.authorDai, J.en_US
dc.contributor.authorWang, P.S.en_US
dc.contributor.authorLu, R.en_US
dc.contributor.authorSong, Yuen_US
dc.contributor.authorZhang, Chenglinen_US
dc.contributor.authorTan, G.T.en_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.authorHu, D.en_US
dc.contributor.authorLi, S.L.en_US
dc.contributor.authorNormand, B.en_US
dc.contributor.authorYu, Weiqiangen_US
dc.date.accessioned2016-04-29T15:49:33Z
dc.date.available2016-04-29T15:49:33Z
dc.date.issued2014en_US
dc.description.abstractWe report a detailed nuclear magnetic resonance (NMR) study by combined Na23 and As75 measurements over a broad range of doping to map the phase diagram of NaFe1−xCoxAs. In the underdoped regime (x≤0.017), we find a magnetic phase with robust antiferromagnetic (AFM) order, which we denote the s-AFM phase, cohabiting with a phase of weak and possibly proximity-induced AFM order (w-AFM) whose volume fraction V≃8% is approximately constant. Near optimal doping, at x=0.0175, we observe a phase separation between static antiferromagnetism related to the s-AFM phase and a paramagnetic (PM) phase related to w-AFM. The volume fraction of AFM phase increases upon cooling, but both the Néel temperature and the volume fraction can be suppressed systematically by applying a c-axis magnetic field. On cooling below Tc, superconductivity occupies the PM region and its volume fraction grows at the expense of the AFM phase, demonstrating a phase separation of the two types of order based on volume exclusion. At higher dopings, static antiferromagnetism and even critical AFM fluctuations are completely suppressed by superconductivity. Thus the phase diagram we establish contains two distinct types of phase separation and reflects a strong competition between AFM and superconducting phases both in real space and in momentum space. We suggest that both this strict mutual exclusion and the robustness of superconductivity against magnetism are consequences of the extreme two-dimensionality of NaFeAs.en_US
dc.identifier.citationMa, Long, Dai, J., Wang, P.S., et al.. "Phase separation, competition, and volume-fraction control in NaFe1−xCoxA." <i>Physical Review B,</i> 90, no. 14 (2014) American Physical Society: 144502. http://dx.doi.org/10.1103/PhysRevB.90.144502.
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.90.144502en_US
dc.identifier.urihttps://hdl.handle.net/1911/90377
dc.language.isoengen_US
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.titlePhase separation, competition, and volume-fraction control in NaFe1−xCoxAen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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