Dynamical mean-field theory for transition temperature and optics of pseudocubic manganites

A tight-binding parametrization of local spin density-functional band theory is combined with a dynamical mean-field treatment of correlations to obtain a theory of the magnetic transition temperature and optical conductivity and T=0 spin-wave stiffness of a minimal model for the pseudocubic metallic colossal magnetoresistance manganites such a La1-xSrxMnO3. The results indicate that previous estimates of T-c obtained by one of us [Phys. Rev. B 61, 10 738 (2000)] are in error, that in fact the materials are characterized by Hund's coupling Japproximate to1.5 eV, and that magnetic-order-driven changes in the kinetic energy may not be the cause of the observed "colossal" magnetoresistive and multiphase behavior in the manganites, raising questions about our present understanding of these materials.