Abstract
The effect of orbital degeneracy on metallic ferromagnetism is considered in the strongcoupling limit of the Hubbard model within a generalized Roth approximation. Forconcentrations of less than one electron per lattice site and forbidden double occupancy wefind that orbital degeneracy favours magnetic polarization on different lattice structures.The effect is strong enough to induce a ferromagnetic ordering even on frustrated lattices,where polarization is excluded in the absence of degeneracy. We discuss the physical originof the new results in terms of competition between tendencies towards localization anddelocalization.
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