Ground state energy of metallic ferromagnet in a generalized Hubbard model
arXiv:cond-mat/0012402
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. In the case of weak electron-electron interaction the ground state energy and condition of ferromagnetic state realization are found using the Green function technique. The obtained results indicate the important role of correlated hopping.
9 pages, 11 eps figures