Hopping conductivity in one-dimensional Ca/sub 3/Co/sub 2/O/sub 6/ single crystals
dc.contributor.author | Raquet, Bertrand | pt_BR |
dc.contributor.author | Baibich, Mario Norberto | pt_BR |
dc.contributor.author | Broto, Jean Marc | pt_BR |
dc.contributor.author | Rakoto, Harison | pt_BR |
dc.contributor.author | Lambert, Sébastien | pt_BR |
dc.contributor.author | Maignan, Antoine | pt_BR |
dc.date.accessioned | 2014-09-30T02:12:35Z | pt_BR |
dc.date.issued | 2002 | pt_BR |
dc.identifier.issn | 1098-0121 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/103927 | pt_BR |
dc.description.abstract | We 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.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. B, Condensed matter and materials physics. New York. Vol. 65, no. 10 (Mar. 2002), 104442 6p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Materiais antiferromagnéticos | pt_BR |
dc.subject | Compostos de cálcio | pt_BR |
dc.subject | Magnetorresistência gigante | pt_BR |
dc.subject | Materiais ferromagnéticos | pt_BR |
dc.subject | Modelo de heisenberg | pt_BR |
dc.title | Hopping conductivity in one-dimensional Ca/sub 3/Co/sub 2/O/sub 6/ single crystals | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000319169 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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