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• W1999067711 abstract "A mean-field approximation of a model for double perovskites that takes into account the coupling between itinerant electron spins and localized spins is developed. As in previously reported theoretical results, and contrary to experimental observation, the critical temperature is suppressed for large electron density. An effective Heisenberg model reveals the cause of this discrepancy: the competition between degenerate antiferromagnetic and ferromagnetic channels. This degeneracy can be broken by the inclusion of a Hubbard-type $U$ term. It is therefore suggested that electron correlation effects need to be incorporated in the minimal model of double perovskites in order to explain the experimental observation of increasing ferromagnetic critical temperature with increasing electron doping." @default.
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• W1999067711 date "2006-09-27" @default.
• W1999067711 modified "2023-09-29" @default.
• W1999067711 title "Mean-field theory for double perovskites: Coupling between itinerant electron spins and localized spins" @default.
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• W1999067711 doi "https://doi.org/10.1103/physrevb.74.094429" @default.
• W1999067711 hasPublicationYear "2006" @default.
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