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- W2056726109 abstract "We present a microscopic theory of carrier-induced ferrimagnetism in metallic double perovskite compounds such as ${mathrm{Sr}}_{2}{mathrm{FeMoO}}_{6}$ and ${mathrm{Sr}}_{2}{mathrm{FeReO}}_{6}$ which have recently attracted intense interest for their possible applications to magnetotransport devices. The theory is based on an effective ``Kondo-like'' Hamiltonian treated here within the large-$S$ expansion. We find that depending on the value of the carrier density the ground state is either a ferrimagnet or a layered antiferromagnet. The ferrimagnetic state has a robust half-metallic electronic structure. The transition to antiferromagnetic phase is first order, accompanied with the regime of phase separation. We study spin-wave spectrum including quantum corrections and find strongly enhanced quantum effects in the vicinity of zero-temperature phase transition." @default.
- W2056726109 created "2016-06-24" @default.
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- W2056726109 date "2003-09-02" @default.
- W2056726109 modified "2023-09-25" @default.
- W2056726109 title "Microscopic model, spin-wave theory, and competing orders in double perovskites" @default.
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- W2056726109 doi "https://doi.org/10.1103/physrevb.68.092401" @default.
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