Conditions of ferromagnetic ordering in a model with Anderson-Hubbard centers: effective Hamiltonian approach

A model of strongly correlated electron system in which magnetic impurity levels are hybridized with conduction band has been considered. The effective Hamiltonian has been constructed for the case of strong Coulomb correlation on basis of configurational representation of Hamiltonian with Hubbard X...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.391 (1), p.12158-4
Main Authors: Kramar, O, Didukh, L, Skorenkyy, Yu
Format: Article
Language:English
Subjects:
Conduction bands
Correlation
Curie temperature
Exchange
Ferromagnetism
Magnetism
Mathematical analysis
Mathematical models
Operators (mathematics)
Order disorder
Physics
Representations
Subsystems
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Summary:A model of strongly correlated electron system in which magnetic impurity levels are hybridized with conduction band has been considered. The effective Hamiltonian has been constructed for the case of strong Coulomb correlation on basis of configurational representation of Hamiltonian with Hubbard X-operators describing the localized spin subsystem. Criteria for the ferromagnetic ordering stabilization have been found in partial case of partially filled band for arbitrary temperatures and Curie temperature has been calculated. For the partial case of weak effective exchange the formula for the Curie temperature reproducing the well-established results has been calculated analytically. The electron concentration region favorable for ferromagnetic ordering is determined by hybridization through effective exchange integral.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/391/1/012158