ar X iv : c on d - m at / 9 50 51 17 v 1 2 5 M ay 1 99 5 Temperature Dependence of the Conductivity in ( La , Sr ) MnO 3
نویسنده
چکیده
Using the Kondo lattice model with classical spins in infinite dimension, conductivity in the perovskite-type 3d transition-metal oxide (La,Sr)MnO3 is theoretically studied. Green’s functions as well as spontaneous magnetization are obtained exactly on the Bethe lattice as a function of temperature. Conductivity is calculated from the Kubo formula. Below the Curie temperature, resistivity as a function of magnetization is in a good agreement with the experimental data. Anomalous behaviour in the temperature dependence of the optical conductivity observed in (La,Sr)MnO3 is also explained.
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