Effects of spin and orbital degeneracy on the thermopower of strongly correlated systems - art. no. 236603

We study thermopower in strongly correlated electron systems with orbital d egeneracy using numerical diagonalization method on finite-size clusters. I t is shown that the thermopower is strongly enhanced by the spin and orbita l degrees of freedom, but the resistivity is significantly less affected. A key for the strategy of new thermoelectric materials in transition metal o xides is proposed in the light of the theory.