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Metallic ferromagnetism in the 3D Hubbard model at finite temperature

Research paper by André Neves Ribeiro, Claudio Andrade Macedo

Indexed on: 06 Jun '13Published on: 06 Jun '13Published in: The journal of the Korean Physical Society



Abstract

The goal of this work is to examine the possibility of ferromagnetism in a three-dimensional lattice using the Hubbard model with only nearest-neighbor hopping and finite on-site Coulomb interaction (U) and temperature (T) when solved using the dynamical mean-field approximation (DMFA). We calculated the density of states for an fcc lattice with n = 0.6, 0.7 and 0.8, at T = 0.04 t/kB, and with U = 3W where W denotes the non-interacting energy bandwidth. The results reveal magnetization that is nearly saturated and indicate that these systems are metallic. In the particular case where n = 0.6, the magnetization, internal energy and specific-heat versus temperature curves were calculated.