Theory of Transition Temperature of Magnetic Double Perovskites
A. Chattopadhyay, A. J. Millis
Abstract
We formulate a theory of double perovskite coumpounds such as Sr2FeReO6 and Sr2FeMoO6 which have attracted recent attention for their possible uses as spin valves and sources of spin polarized electrons. We solve the theory in the dynamical mean field approximation to find the magnetic transition temperature Tc. We find that Tc is determined by a subtle interplay between carrier density and the Fe-Mo/Re site energy difference, and that the non-Fe same-sublattice hopping acts to reduce Tc. Our results suggest that presently existing materials do not optimize Tc.
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