Can correlated substitution enhance the Curie temperature in diluted magnetic semiconductors?

Bouzerar, Georges; Ziman, Timothy; Kudrnovský, Josef
November 2004
Applied Physics Letters;11/22/2004, Vol. 85 Issue 21, p4941
Academic Journal
We present a quantitative theory for ferromagnetism in diluted magnetic semiconductors under the assumption that the positions of the substitutional magnetic impurities are correlated. The theory predicts that room-temperature ferromagnetism should be possible in macroscopically homogeneous samples of MnxGa1-xAs if the probability of pairs of Mn impurities on neighboring Ga sites is sufficiently enhanced. The theory predicts similar increases in the Curie temperatures for MnxGa1-xN but the temperatures remain lower than in MnxGa1-xAs.


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