Magnetic Structure at Ground State of Hubbard Model

Abstract

The magnetic structure at the ground state of the single band Hubbard model is investigated. The extended Gutzwiller method is adopted. It is found, if the intra-atomic Coulomb integral is sufficiently large, that the ferromagnetic or antiferromagnetic ground states are obtained at nearly half-filled band in the cases of the simple cubic and body centered cubic structures and that the ferromagnetic ground states are obtained at more than half-filled band in the cases of the face centered cubic and hexagonal closed packed structures.