FERROMAGNETIC ORDERING IN A GENERALIZED HUBBARD MODEL
Author(s): L.Didukh, O.Kramar, Yu.Skorenkyy (Ternopil State Technical University, Department of Physics, 56 Rus'ka Str., 46001 Ternopil, Ukraine)
The present paper considers ferromagnetic ordering in the Hubbard model generalized by taking into account the inter-atomic exchange interaction and the correlated hopping in a partially filled narrow band. Expressions for the magnetization and for the Curie temperature as functions of model parameters and band filling are obtained in the case of weak intra-atomic Coulomb interaction. The condition of ferromagnetic state realization is found. The results obtained indicate the important role of correlated hopping.
Key words: ferromagnetic ordering, correlated hopping, exchange
interaction, magnetization, Curie temperature
PACS: 71.10.Fd, 71.30.+h, 71.27.+a
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