Diluted magnetic semiconductors with correlated impurities: Mean-field theory with RKKY interaction

Abstract

In the framework of the generalized mean-field theory, the influence of correlating impurities in diluted magnetic semiconductors with indirect RKKY interaction is studied. It is shown that there is the limited range of impurity concentrations $x$ where ferromagnetic ordering is possible and clustering shifts that interval to lower $x$ values. The Curie temperature is a nonmonotone function of $x$, peaks at $x\ensuremath{\sim}0.1$, and its maximum value is slightly influenced by the clustering.