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dc.contributor.authorRaquet, Bertrandpt_BR
dc.contributor.authorBaibich, Mario Norbertopt_BR
dc.contributor.authorBroto, Jean Marcpt_BR
dc.contributor.authorRakoto, Harisonpt_BR
dc.contributor.authorLambert, Sébastienpt_BR
dc.contributor.authorMaignan, Antoinept_BR
dc.date.accessioned2014-09-30T02:12:35Zpt_BR
dc.date.issued2002pt_BR
dc.identifier.issn1098-0121pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/103927pt_BR
dc.description.abstractWe studied the electronic conductivity and magnetic properties of quasi-one-dimensional Ca₃Co₂O₆ single crystals. The results evidence a variable range hopping conductivity with temperature-induced crossover between one-dimensional (intrachain) and three-dimensional (3D) transport and the opening of a Coulomb gap in the d bands along with the ferromagnetic intrachain ordering. At low temperatures, an applied magnetic field induces a large negative magnetoresistance (MR) in apparent dissociation with the 3D magnetic ordering. Both spin-dependent hopping and field-induced suppression of the Coulomb gap are discussed. The electronic hopping parameters we infer agree remarkably with the accessible Co sites. Surprising narrow peaks corresponding to a transient resistivity decrease are observed on the MR curves. We discuss these in terms of peculiar in-plane magnetization states in an Ising-like Heisenberg antiferromagnetic triangular lattice during the magnetization reversal.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review. B, Condensed matter and materials physics. New York. Vol. 65, no. 10 (Mar. 2002), 104442 6p.pt_BR
dc.rightsOpen Accessen
dc.subjectMateriais antiferromagnéticospt_BR
dc.subjectCompostos de cálciopt_BR
dc.subjectMagnetorresistência gigantept_BR
dc.subjectMateriais ferromagnéticospt_BR
dc.subjectModelo de heisenbergpt_BR
dc.titleHopping conductivity in one-dimensional Ca/sub 3/Co/sub 2/O/sub 6/ single crystalspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000319169pt_BR
dc.type.originEstrangeiropt_BR


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