Abstract
Taking into account the orbital degree of freedom in the double-exchange model, we study the localization of conduction electrons by using a standard transfer matrix method combined with the finite-scaling ansatz. It is found that the orbital polarizations, regardless of being ordered or disordered, are always in favor of the localization of electrons. The orbital disorder plus the randomness of local spins is sufficient to localize electrons below the Curie temperature, resulting in a metal-insulator transition (MIT); while the orbital ordering gives rise to anisotropy and so has an even stronger localization effect. The relation between MIT induced by the spin and orbital configurations and the recent experimental observations in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ is discussed.
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