Temperature Dependence of the Conductivity in (La,Sr)MnO${}_3$

Abstract

Using the Kondo lattice model with classical spins in infinite dimension, conductivity in the perovskite-type $3d$ transition-metal oxide (La,Sr)MnO${}_3$ 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)MnO${}_3$ is also explained.

7 pages, LaTeX, with 2 PS figures

References in corpus (4)

• Transport Properties of the Kondo Lattice Model in the Limit $S=\infty$ and $D=\infty$
• The Hubbard Model at Infinite Dimensions: Thermodynamic and Transport Properties
• Magnetoresistance of the Double-Exchange Model in Infinite Dimension
• Magnetic Transition Temperature of (La,Sr)MnO${}_3$

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