Abstract
We calculate effective exchange interactions in dilute magnetic semiconductors by taking local environment effects into account. The effects of local impurity configurations are considered by embedding a large cluster into the effective medium calculated by the Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA) method. Calculated exchange interactions by our cluster embedding method differ from those calculated by the Liechtenstein's method, because in our method the multiple scattering effect between site i and j is fully included. It is also found that the calculated exchange interactions strongly depend on the position of the impurities in the cluster other than site i and j. The average of the configuration dependent interactions approximately converge to the two impurity embedding results. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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