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Discontinuous transitions in double-exchange materials

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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.accessioned2023-06-20T20:18:38Z
dc.date.available2023-06-20T20:18:38Z
dc.date.issued2001-02-01
dc.description© 2001 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. V.M.-M. acknowledges the financial support of MEC. The Monte Carlo simulations have been carried out in RTNN computers at Zaragoza and Madrid. We acknowledge financial support from Grant Nos. PB96-0875, AEN97-1680, AEN97-1693, AEN99-0990 (MEC, Spain), and (07N/0045/98) (C. Madrid).
dc.description.abstractIt is shown that the double-exchange Hamiltonian, with weak antiferromagnetic interactions, has a rich variety of first-order transitions between phases with different electronic densities and/or magnetizations. The paramagnetic-ferromagnetic transition moves towards lower temperatures, and becomes discontinuous as the relative strength of the double-exchange mechanism and antiferromagnetic coupling is changed. This trend is consistent with the observed differences between compounds with the same nominal doping, such as La_(2/3)Sr_(1/3)MnO_(3) and La_(2/3)Ca_(1/3)MnO_(3). Our results suggest that, in the low doping regime, a simple magnetic mechanism suffices to explain the main features of the phase diagram.
dc.description.departmentDepto. de Física Teórica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMEC, Spain
dc.description.sponsorshipC. Madrid, Spain
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/40079
dc.identifier.doi10.1103/PhysRevB.63.064416
dc.identifier.issn1098-0121
dc.identifier.officialurlhttp://doi.org/10.1103/PhysRevB.63.064416
dc.identifier.relatedurlhttp://journals.aps.org/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/60058
dc.issue.number6
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.projectIDAEN99-0990
dc.relation.projectID07N/0045/98
dc.rights.accessRightsopen access
dc.subject.cdu53
dc.subject.keywordInelastic-neutron-scattering
dc.subject.keywordMetal-insulator-transition
dc.subject.keywordMixed-valence manganites
dc.subject.keywordSpectral moments method
dc.subject.keywordcolossal-magnetoresistance
dc.subject.keywordPhase-separation
dc.subject.keywordManganese perovskites
dc.subject.keywordSpin dynamics
dc.subject.keywordFerromagnetic manganites
dc.subject.keywordCharge localization.
dc.subject.ucmFísica (Física)
dc.subject.ucmFísica-Modelos matemáticos
dc.subject.unesco22 Física
dc.titleDiscontinuous transitions in double-exchange materials
dc.typejournal article
dc.volume.number63
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