Physics – Condensed Matter
Scientific paper
1995-05-03
Springer Series in Solid-State Sciences 119
Physics
Condensed Matter
to be published in Proc. 17th Taniguchi International Conference on "Spectroscopy of Mott Insulators and Correlated Metals", 7
Scientific paper
The Kondo lattice model with Hund's ferromagnetic spin coupling is investigated as a microscopic model of the perovskite-type $3d$ manganese oxide (R,A)MnO$_3$ where $R$ and $A$ are rare earth element and alkaline earth element, respectively. We take the classical spin limit $S=\infty$ for the simplicity of the calculation, since the quantum exchange process seems to be irrelevant in the high temperature paramagnetic phase. Magnetic and transport properties of the system are calculated. In the hole doped systems, ferromagnetic instabilities are observed as the temperature is lowered. The giant magnetoresistance of this model is in excellent agreement with the experimental data of (La,Sr)MnO$_3$.
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