Mean field theory for double-perovskites

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dc.creatorBrey, L.
dc.creatorCalderon, M. J.
dc.creatorSarma, S. Das
dc.creatorGuinea, F.
dc.date2006-03-06
dc.date.accessioned2026-07-07T07:02:10Z
dc.date.available2026-07-07T07:02:10Z
dc.descriptionA mean field approximation of a model for double perovskites that takes into account the coupling between itinerant electron spins and localized spins is developed. As in previously reported theoretical results, and contrary to experimental observation, the critical temperature is suppressed for large electron density. An effective Heisenberg model reveals the cause of this discrepancy: the competition between degenerate antiferromagnetic and ferromagnetic channels. This degeneracy can be broken by the inclusion of a Hubbard-type U term. It is therefore suggested that electron correlation effects need to be incorporated in the minimal model of double perovskites in order to explain the experimental observation of increasing ferromagnetic critical temperature with increasing electron doping.
dc.description8 pages, including 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0603143
dc.identifierhttp://arxiv.org/abs/cond-mat/0603143
dc.identifierPhys. Rev. B 74, 094429 (2006)
dc.identifierdoi:10.1103/PhysRevB.74.094429
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108509
dc.subjectMaterials Science
dc.subjectStrongly Correlated Electrons
dc.titleMean field theory for double-perovskites
dc.typetext

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