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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Format: | Article |
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Institute for Condensed Matter Physics
2005-01-01
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Series: | Condensed Matter Physics |
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Online Access: | http://dx.doi.org/10.5488/CMP.8.3.547 |
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author | L.Didukh O.Kramar |
author_facet | L.Didukh O.Kramar |
author_sort | L.Didukh |
collection | DOAJ |
description | 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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format | Article |
id | doaj.art-6bb7e8da5d2b426aa736e7c44d69f2ce |
institution | Directory Open Access Journal |
issn | 1607-324X |
language | English |
last_indexed | 2024-04-11T23:57:30Z |
publishDate | 2005-01-01 |
publisher | Institute for Condensed Matter Physics |
record_format | Article |
series | Condensed Matter Physics |
spelling | doaj.art-6bb7e8da5d2b426aa736e7c44d69f2ce2022-12-22T03:56:20ZengInstitute for Condensed Matter PhysicsCondensed Matter Physics1607-324X2005-01-018354756410.5488/CMP.8.3.547Metallic ferromagnetism in the systems with strongly correlated electronsL.DidukhO.KramarThe 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.http://dx.doi.org/10.5488/CMP.8.3.547narrow energy bandferromagnetismground state energymagnetization |
spellingShingle | L.Didukh O.Kramar Metallic ferromagnetism in the systems with strongly correlated electrons Condensed Matter Physics narrow energy band ferromagnetism ground state energy magnetization |
title | Metallic ferromagnetism in the systems with strongly correlated electrons |
title_full | Metallic ferromagnetism in the systems with strongly correlated electrons |
title_fullStr | Metallic ferromagnetism in the systems with strongly correlated electrons |
title_full_unstemmed | Metallic ferromagnetism in the systems with strongly correlated electrons |
title_short | Metallic ferromagnetism in the systems with strongly correlated electrons |
title_sort | metallic ferromagnetism in the systems with strongly correlated electrons |
topic | narrow energy band ferromagnetism ground state energy magnetization |
url | http://dx.doi.org/10.5488/CMP.8.3.547 |
work_keys_str_mv | AT ldidukh metallicferromagnetisminthesystemswithstronglycorrelatedelectrons AT okramar metallicferromagnetisminthesystemswithstronglycorrelatedelectrons |