The effects of charge carriers on the magnetic behavior of ferromagnetic semiconductors within single-site approximation

Coherent potential approximation (CPA) is used to study the effects of char ge carriers on the magnetic properties of ferromagnetic semiconductors. We have used a generalized mean-field theory for fluctuating f spins, and Vons ovskii model for interaction of conduction electrons with localized spins t o calculate the edge of conduction band, the magnetization, the electron-sp in polarization and the magnetic transition temperature. The results of our calculations are compared with the RKKY theory and the experimental result s for Gd-doped EuO. (C) 2001 Elsevier Science B.V. All rights reserved.