Short-Range Ordered Phase of the Double-Exchange Model in Infinite Dimensions

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dc.creatorFishman, R. S.
dc.creatorPopescu, F.
dc.creatorAlvarez, G.
dc.creatorMaier, Th.
dc.creatorMoreno, J.
dc.date2005-09-10
dc.date2006-04-23
dc.date.accessioned2026-07-07T06:41:45Z
dc.date.available2026-07-07T06:41:45Z
dc.descriptionUsing dynamical mean-field theory, we have evaluated the magnetic instabilities and T=0 phase diagram of the double-exchange model on a Bethe lattice in infinite dimensions. In addition to ferromagnetic (FM) and antiferromagnetic (AF) phases, we also study a class of disordered phases with magnetic short-range order (SRO). In the weak-coupling limit, a SRO phase has a higher transition temperature than the AF phase for all fillings p below 1 and can even have a higher transition temperature than the FM phase. At T=0 and for small Hund's coupling J_H, a SRO state has lower energy than either the FM or AF phases for 0.26\le p < 1. Phase separation is absent in the J_H --> 0 limit but appears for any non-zero value of J_H.
dc.description11 pages, 3 figures, published version
dc.identifierhttps://arxiv.org/abs/cond-mat/0509270
dc.identifierhttp://arxiv.org/abs/cond-mat/0509270
dc.identifierPhys. Rev. B 73, 140405(R) (2006)
dc.identifierdoi:10.1103/PhysRevB.73.140405
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/101785
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleShort-Range Ordered Phase of the Double-Exchange Model in Infinite Dimensions
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