Spin freezing in the disordered pyrochlore magnet NaCaCo2F7: NMR studies and Monte Carlo simulations

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dc.contributor.authorSarkar, R.
dc.contributor.authorKrizan, J. W.
dc.contributor.authorBrueckner, F.
dc.contributor.authorAndrade, E. C. [UNESP]
dc.contributor.authorRachel, S.
dc.contributor.authorVojta, M.
dc.contributor.authorCava, R. J.
dc.contributor.authorKlauss, H. -H.
dc.contributor.institutionTech Univ Dresden
dc.contributor.institutionPrinceton Univ
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniv Melbourne
dc.date.accessioned2018-11-26T17:42:47Z
dc.date.available2018-11-26T17:42:47Z
dc.date.issued2017-12-12
dc.description.abstractWe present results of Na-23 and F-19 nuclear magnetic resonance (NMR) measurements on NaCaCo2F7, a frustrated pyrochlore magnet with a Curie-Weiss temperature Theta(CW) approximate to -140 K and intrinsic bond disorder. Below 3.6 K both the Na-23 and F-19 spectra broaden substantially in comparison to higher temperatures accompanied by a considerable reduction (80%) of the NMR signal intensity: This proves a broad quasistatic field distribution. The F-19 spin-lattice relaxation rate (19)(1/T-1) exhibits a peak at 2.9 K already starting to develop below 10 K. We attribute the spin freezing to the presence of bond disorder. This is corroborated by large-scale Monte Carlo simulations of a classical bond-disordered XY model on the pyrochlore lattice. The low freezing temperature, together with the very short magnetic correlation length not captured by the simulations, suggests that quantum effects play a decisive role in NaCaCo2F7.en
dc.description.affiliationTech Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany
dc.description.affiliationPrinceton Univ, Dept Chem, Princeton, NJ 08544 USA
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, Rua Dr Bento Teobaldo Ferraz 271,Bloco 2, BR-01140070 Sao Paulo, Brazil
dc.description.affiliationUniv Sao Paulo, Inst Fis Sao Carlos, Caixa Postale 369, BR-13560970 Sao Paulo, Brazil
dc.description.affiliationTech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany
dc.description.affiliationUniv Melbourne, Sch Phys, Parkville, Vic 3010, Australia
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, Rua Dr Bento Teobaldo Ferraz 271,Bloco 2, BR-01140070 Sao Paulo, Brazil
dc.description.sponsorshipDeutsche Forschungsgemeinschaft (DFG)
dc.description.sponsorshipU.S. Department of Energy (DOE) Division of Basic Energy Sciences
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdDeutsche Forschungsgemeinschaft (DFG): SFB 1143
dc.description.sponsorshipIdU.S. Department of Energy (DOE) Division of Basic Energy Sciences: DE-FG02-08ER46544
dc.description.sponsorshipIdFAPESP: 2013/00681-8
dc.format.extent10
dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.96.235117
dc.identifier.citationPhysical Review B. College Pk: Amer Physical Soc, v. 96, n. 23, 10 p., 2017.
dc.identifier.doi10.1103/PhysRevB.96.235117
dc.identifier.issn2469-9950
dc.identifier.urihttp://hdl.handle.net/11449/163621
dc.identifier.wosWOS:000417757200004
dc.language.isoeng
dc.publisherAmer Physical Soc
dc.relation.ispartofPhysical Review B
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.titleSpin freezing in the disordered pyrochlore magnet NaCaCo2F7: NMR studies and Monte Carlo simulationsen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
dcterms.rightsHolderAmer Physical Soc

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