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Interplay of Mott Transition and Ferromagnetism in the Orbitally Degenerate Hubbard Model
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.Comment: 5 pages, revtex, 5 postscript figures, submitted to Phys. Rev.