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- W2079766500 abstract "The scheme of Baym and Kadanoff is applied to a system of conduction electrons in a semiconductor or a semimetal interacting via an exchange interaction $J$ with a periodic array of local spins. The time-dependent spin Green functions are calculated rigorously up to second order in $J$. The prominent feature of the derived equations is that the poles of the transverse Green function for the localized spins (or the magnetic susceptibility) lead to two branches of excitations rather than a single dressed spin wave. The damping of these two modes is shown to be small in the limit of low temperatures where the system is bottlenecked. The expression of the relaxation times of the disturbed magnetizations to the instantaneous local equilibrium magnetization entering Hasegawa's equation are derived for both the electron and the local spin system. In the limit of high temperatures, the expressions are shown to match the former results of the theory of spin resonance in dilute magnetic alloys." @default.
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- W2079766500 date "1984-04-01" @default.
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- W2079766500 title "Theory of magnetic excitations in ferromagnetic semiconductors" @default.
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- W2079766500 doi "https://doi.org/10.1103/physrevb.29.3815" @default.
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