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

Details Comment on "Effects of Disorder on Ferromagnetism in Diluted Magnetic Semiconductors" Comment on "Effects of Disorder on Ferromagnetism in Diluted Magnetic Semiconductors"

2001-11-27

arxiv.org/abs/cond-mat/0111504v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

2 pages RevTeX, including 1 figure

Scientific paper

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

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