Interplay of Mott Transition and Ferromagnetism in the Orbitally Degenerate Hubbard Model

Details Interplay of Mott Transition and Ferromagnetism in the Orbitally Degenerate Hubbard Model Interplay of Mott Transition and Ferromagnetism in the Orbitally Degenerate Hubbard Model

1996-12-18

arxiv.org/abs/cond-mat/9612172v1

Phys. Rev. B, 56 (1997) 12909

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, revtex, 5 postscript figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.56.12909

A slave boson representation for the degenerate Hubbard model is introduced. The location of the metal to insulator transition that occurs at commensurate densities is shown to depend weakly on the band degeneracy M. The relative weights of the Hubbard sub-bands depend strongly on M, as well as the magnetic properties. It is also shown that a sizable Hund's rule coupling is required in order to have a ferromagnetic instability appearing. The metal to insulator transition driven by an increase in temperature is a strong function of it.

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