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- W2062804908 abstract "A quasiparticle method based on a multisite s(p)–d mixing model is used to calculate the exchange constants of dilute magnetic semiconductors (DMS). The effective interaction, which is mediated by s(p) electrons, between d electrons, was taken into account in an effective field approximation or a coherent potential approximation (CPA). The equation-of-motion technique was applied to Green functions to calculate the quasiparticle state density. The exchange constants were calculated in a double-valence-band model, and the microscopic parameter dependences of the exchange constants are investigated for fixed valence band parameters in the model. A ferromagnetic d–d coupling is obtained when the d energy level Ed is in the vicinity of the valence band top, and an antiferromagnetic d–d coupling is obtained when Ed is in the vicinity of the valence band bottom. The maximum of the d–d exchange constant Jd d(Ed) increases with the mixing strength. Jd d increases with decreasing Fermi energy EF, and the effect is more significant when Ed approaches the valence band top. Jd d also increases with small magnetic impurity concentration x, then reaches a maximum, and finally decreases sharply when x increases further. The quasiparticle state density shows that the ferromagnetism originates from the unsymmetrical broadening of the shallow d energy level in ferromagnetic alignment and related lowering of the centre of gravity of the d state density. Relevant experimental results are discussed on the basis of our calculation." @default.
- W2062804908 created "2016-06-24" @default.
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- W2062804908 date "2004-10-02" @default.
- W2062804908 modified "2023-10-18" @default.
- W2062804908 title "Calculation of exchange constants of III–V dilute magnetic semiconductors using a quasiparticle method" @default.
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- W2062804908 doi "https://doi.org/10.1088/0953-8984/16/41/025" @default.
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