Metallic ferromagnetism in the systems with strongly correlated electrons

The present paper considers the ground state ferromagnetic ordering in narrow-band models with strongly correlated electrons, in particular, in a single-band generalized Hubbard model with correlated hopping and interatomic exchange interaction, as well as in a double orbitally degenerate Hubbard mo...

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Bibliographic Details
Published in:Condensed matter physics 2005, Vol.8 (3), p.547-564
Main Authors: Didukh, Kramar
Format: Article
Language:English
Subjects:
ferromagnetism
ground state energy
magnetization
narrow energy band
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Summary:The present paper considers the ground state ferromagnetic ordering in narrow-band models with strongly correlated electrons, in particular, in a single-band generalized Hubbard model with correlated hopping and interatomic exchange interaction, as well as in a double orbitally degenerate Hubbard model with correlated hopping. The effective Hamiltonians of these models are treated by means of variants of generalized Hartree-Fock approximations, in which the quasi-particle energy spectra are obtained. The ground state energy, critical electron concentration and magnetization are calculated for some types of density of states. The mechanisms of ferromagnetic ordering stability in the narrow-band materials are discussed.
ISSN:1607-324X
DOI:10.5488/CMP.8.3.547