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Variational mean-field approach to the double-exchange model

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dc.contributor.authorAlonso, J. L.
dc.contributor.authorFernández Pérez, Luis Antonio
dc.contributor.authorGuinea, F.
dc.contributor.authorLaliena, V.
dc.contributor.authorMartín Mayor, Víctor
dc.date.accessioned2023-06-20T00:26:34Z
dc.date.available2023-06-20T00:26:34Z
dc.date.issued2011-02-01
dc.description© 2001 The American Physical Society. We are thankful for helpful conversations to L. Brey, J. Fontcuberta, G. Gómez-Santos, C. Simon, J. M. de Teresa, and especially to R. Ibarra and V. S. Amaral. V.M.-M. was partially supported by MEC. We acknowledge financial support from Grant Nos. PB96-0875, AEN97-1680, AEN97- 1693, AEN97-1708, AEN99-0990 (MEC, Spain), and (07N/0045/98) (C. Madrid).
dc.description.abstractIt has been recently shown that the double exchange Hamiltonian, with weak antiferromagnetic interactions, has a richer variety of first- and second-order transitions than previously anticipated, and that such transitions are consistent with the magnetic properties of manganites. Here we present a thorough discussion of the variational mean-field approach that leads to these results. We also show that the effect of the Berry phase turns out to be crucial to produce first-order paramagnetic-ferromagnetic transitions near half filling with transition temperatures compatible with the experimental situation. The computation relies on two crucial facts: the use of a mean-field ansatz that retains the complexity of a system of electrons with off-diagonal disorder, not fully taken into account by the mean-field techniques, and the small but significant antiferromagnetic superexchange interaction between the localized spins.
dc.description.departmentDepto. de Física Teórica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMEC
dc.description.sponsorshipComunidad de Madrid
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/40116
dc.identifier.doi10.1103/PhysRevB.63.054411
dc.identifier.issn1098-0121
dc.identifier.officialurlhttp://doi.org/10.1103/PhysRevB.63.054411
dc.identifier.relatedurlhttp://journals.aps.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/42572
dc.issue.number5
dc.journal.titlePhysical review B
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.relation.projectIDPB96-0875
dc.relation.projectIDAEN97-1680
dc.relation.projectIDAEN97- 1693
dc.relation.projectIDAEN97-1708
dc.relation.projectIDAEN99-0990
dc.relation.projectID07N/0045/98
dc.rights.accessRightsopen access
dc.subject.cdu53
dc.subject.keywordSpectral moments method
dc.subject.keywordDiluted ising-model
dc.subject.keywordPhase-separation
dc.subject.keywordColossal magnetoresistance
dc.subject.keywordFerromagnetic manganites
dc.subject.keywordManganese perovskites
dc.subject.keywordCritical exponents
dc.subject.keywordElectronic models
dc.subject.keywordDoped manganies
dc.subject.keywordSpin dynamics.
dc.subject.ucmFísica (Física)
dc.subject.ucmFísica-Modelos matemáticos
dc.subject.unesco22 Física
dc.titleVariational mean-field approach to the double-exchange model
dc.typejournal article
dc.volume.number63
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