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- W2076849777 abstract "Including twofold orbital degeneracy of the ${e}_{g}$ electrons, the Jahn-Teller coupling and strong correlations, we derive a low-energy effective Hamiltonian for the manganites ${R}_{1ensuremath{-}x}{A}_{x}{mathrm{MnO}}_{3}$ using the projection operator method. A phase diagram for temperature T versus doping concentration x is computed by means of Monte Carlo simulations. Our results, including the phase transition with doping x in the ground state, the x-dependent transition temperature, and the first-order ferromagnetic to A-type antiferromagnetic phase transition near $x=0.5$ upon cooling, are well consistent with experimental observations in the Mn oxides with a relatively wide conduction band, such as ${mathrm{Pr}}_{1ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{MnO}}_{3}$ and ${mathrm{La}}_{1ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{MnO}}_{3}.$" @default.
- W2076849777 created "2016-06-24" @default.
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- W2076849777 date "1999-12-01" @default.
- W2076849777 modified "2023-10-16" @default.
- W2076849777 title "Monte Carlo study of finite-temperature phase diagram of the manganites" @default.
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- W2076849777 doi "https://doi.org/10.1103/physrevb.60.14809" @default.
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