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- W2949282610 abstract "We develop a variational mean-field theory of the ferromagnetic transition in compounds like Lanthanum-Manganite within the framework of the Double-Exchange Model supplemented by modest disorder. We obtain analytical expressions for the transition temperature, its variation with the valence electron-density and its decrease with disorder. We derive an expression for the conductivity for both the paramagnetic and the ferromangetic metallic phases, and study its dependence on the temperature and magnetic field. A simple relation between the resistivity in the ferromagnetic phase and the spontaneous magnetization is found. Our results are in a good agreement with the experimental data on transition temperatures and resistivity in the manganite compounds with relatively small disorder. We comment on the effects of increased disorder." @default.
- W2949282610 created "2019-06-27" @default.
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- W2949282610 date "2001-12-19" @default.
- W2949282610 modified "2023-09-23" @default.
- W2949282610 title "Transition temperature and magnetoresistance in double-exchange compounds with moderate disorder" @default.
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- W2949282610 doi "https://doi.org/10.1103/physrevb.65.024429" @default.
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