Abstract
To understand the incoherent optical response of La 1− x Sr x MnO 3 in the ferromagnetic and metallic phase near the metal–insulator transition, we examine the effects of e g-orbital degeneracy, Coulomb interactions, and Jahn–Teller distortions under the perfect polarization of spins, employing the Lanczös diagonalization method. Orbital fluctuations by the Coulomb interaction induce a large and broad structure of the incoherence and suppress Drude weight. The Jahn–Teller distortions work cooperatively to enhance this incoherence.
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