Ferromagnetism in the Nearly-Half-Filled-Band Hubbard Model at Nonzero Temperatures

Publisher Website
Google Scholar
Abstract
Nagoaka's result that the ground state of the near-neighbor-hopping Hubbard model, for a nearly half-filled band and for interaction strength much greater than hopping energy, is ferromagnetic, is shown to be valid for bosons with spin, as well as fermions, in a finite system. In the thermodynamic limit, the boson system is shown to be nonmagnetic. Ferromagnetism is argued to exist at nonzero temperatures for fermions in an infinite system, and upper and approximate lower bounds are obtained for the Curie temperature.

This publication has 7 references indexed in Scilit: