Spin-Fermion Model of Magnetism: Quasi-particle Many-Body Dynamics

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dc.creatorKuzemsky, A. L.
dc.date2004-08-18
dc.date.accessioned2026-07-07T02:59:49Z
dc.date.available2026-07-07T02:59:49Z
dc.descriptionTheoretical foundations and applications of the generalized spin-fermion (sp-d) exchange lattice model to various magnetic systems, e.g. rare-earth metals and compounds and magnetic semiconductors are discussed. The capabilities of the model to describe spin quasi-particle spectra are investigated. The main emphasis is made on the dynamical behavior of two interacting subsystems, the localized spins and spin density of itinerant carriers. A nonperturbative many-body approach, the Irreducible Green Functions (IGF) method, is used to describe the quasi-particle dynamics. Scattering states are investigated and three branches of magnetic excitations are calculated in the regime characteristic of a magnetic semiconductor. For a simplified version of the model (Kondo lattice model) we study the spectra of quasi-particle excitations with special attention given to diluted magnetic semiconductors in simple approximation, to demonstrate the possibilities of the IGF approach. For this, to include the effects of disorder, a modified mean fields are determined self-consistently. The approach permits to investigate and clarify the role of various interactions and disorder effects in unified and coherent fashion.
dc.descriptionREVTEX 4.0, 19 pages
dc.identifierhttps://arxiv.org/abs/cond-mat/0408406
dc.identifierhttp://arxiv.org/abs/cond-mat/0408406
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24663
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleSpin-Fermion Model of Magnetism: Quasi-particle Many-Body Dynamics
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