Ferromagnetic ordering in a generalized Hubbard model: weak intra-atomic interaction limit

Abstract

In the present work ferromagnetic ordering in the Hubbard model generalized by taking into account the inter-atomic exchange interaction and correlated hopping in partially filled narrow band is considered. Expressions for the magnetization and Curie temperature as functions of model parameters and band filling are obtained in the case of weak intra-atomic Coulomb interaction. Condition of ferromagnetic state realization is found. The obtained results indicate the important role of correlated hopping.