We present a semi-analytic theory for the Curie temperature in diluted magnetic semiconductors that treats disorder effects exactly in the effective Heisenberg Hamiltonian, and spin fluctuations within a local RPA. The exchange couplings are taken from concentration-dependent ab initio estimates. The theory gives very good agreement with published data for well-annealed samples of Mn x Ga 1 − x As. We predict that critical temperatures for strongly p-type Mn x Ga 1 − x N would be lower than in doped GaAs, despite the stronger nearest-neighbour ferromagnetic coupling. We also predict the dependence on the hole concentration.
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Bouzerar et al. (2005) studied this question.
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