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 Hubbar...
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| Datum: | 2005 |
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| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Інститут фізики конденсованих систем НАН України
2005
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| Schriftenreihe: | Condensed Matter Physics |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/119750 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Metallic ferromagnetism in the systems with strongly correlated electrons / L. Didukh, O. Kramar // Condensed Matter Physics. — 2005. — Т. 8, № 3(43). — С. 547–564. — Бібліогр.: 49 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | 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. |
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