High-temperature thermodynamics of the ferromagnetic Kondo-lattice model
- 1 September 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 56 (9) , 5084-5087
- https://doi.org/10.1103/physrevb.56.5084
Abstract
We present a high-temperature series expansion for the ferromagnetic Kondo-lattice model in the large coupling limit, which is used to model colossal magnetoresistance (CMR) perovskites. Our results show the expected crossover to Curie-Weiss behavior at a temperature related to the bandwidth. Estimates for the magnetic transition temperatures are in the experimentally observed range. The compressibility shows that the high-temperature charge excitations can be modeled by spinless fermions. The CMR effect itself, however, warrants the inclusion of dynamic effects and cannot be explained by a static calculation.Keywords
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