TEMPERATURE-DEPENDENT BAND-STRUCTURE OF FERROMAGNETIC METALS WITH LOCALIZED MOMENTS

Autor(en): NOLTING, W
DAMBECK, T
BORSTEL, G
Stichwörter: 4F-SYSTEMS; BAND; DENSITY-FUNCTIONAL THEORY; DYNAMICAL CORRECTIONS; ELECTRONIC-STRUCTURE; EUO; INSULATORS; PHOTOEMISSION; Physics; Physics, Condensed Matter; QUASIPARTICLE STRUCTURE; SEMICONDUCTORS
Erscheinungsdatum: 1993
Herausgeber: SPRINGER
Journal: ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER
Volumen: 90
Ausgabe: 4
Startseite: 413
Seitenende: 425
Zusammenfassung: 
We consider a theoretical model for ferromagnetic metals like Gd, which takes into account the exchange interaction and the hybridization between two electronic subsystems. The first is built up by quasi-localized electrons, which take care for the existence of permanent magnetic moments, and is described by an atomic limit multiband Hubbard-Hamiltonian. The second subsystem consists of relatively broad conduction bands with more or less `'free'' electrons. We investigate the influence of electron correlations on the conduction band states in dependence of temperature T and bandfilling n. A sensitive reaction of the band states on the magnetic ordering of the moment system leads to strong band deformations. The main goal is the determination of a quasiparticle bandstructure, which we derive in analogy to the experiment (PES, IPE) directly from the spectral density. The new aspect is a splitting of the `' bare `' dispersion epsilon(m)(k) into several quasiparticle dispersion curves with strongly T- and n-dependent spectral weights. Even for T > T(c) an `' exchange-caused `' splitting is found. - In this paper we use as input for the `'free'' band energies epsilon(m)(k) a nondegenerate simple cubic-tight binding expression, and in addition seven dispersionless f-levels, in order to stress mainly the influence of many body effects. It is discussed how the model can be coupled to a LDA bandstructure calculation, in order to get quantitative results for the T-dependent electronic structure of the ferromagnetic 4f-metal Gd, the presentation of which is intended in a forthcoming paper.
ISSN: 07223277
DOI: 10.1007/BF01308821

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