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

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

1995-05-25

arxiv.org/abs/cond-mat/9505117v1

J. Phys. Soc. Jpn. 64 (1995) 3164

Physics

Condensed Matter

7 pages, LaTeX, with 2 PS figures

Scientific paper

10.1143/JPSJ.64.3164

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.

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