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In a recent Letter, Berciu and Bhatt have presented a mean-field theory offerromagnetism in III-V semiconductors doped with manganese, starting from animpurity band model. We show that this approach gives an unphysically broadimpurity band and is thus not appropriate for (Ga,Mn)As containing 1-5% Mn. Wealso point out a microscopically unmotivated sign change in the overlapintegrals in the Letter. Without this sign change, stable ferromagnetism is notobtained.

Comment on ”Effects of Disorder on Ferromagnetism in Diluted Magnetic Semiconductors”