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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Main Authors: L.Didukh, O.Kramar
Format: Article
Language:English
Published: Institute for Condensed Matter Physics 2005-01-01
Series:Condensed Matter Physics
Subjects:
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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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