INTERIONIC EXCHANGE INTERACTION IN A(1-X)(II)M(X)B(VI) SYSTEMS

The superexchange interaction integral J(NN) is investigated in semima gnetic semiconductors of the type A(1-x)(II)M(x)B(VI) systems, where t he Mn, Fe, and Co ions are considered as the magnetic component M. Cal culations are done in the framework of Racah's many particle theory in cluding the ground orbital states of the M ions in a cubic crystal. Th e results of these calculations are compared with published experiment al data and with data from a study of the temperature dependence of Fa raday rotation. The superexchange mechanism can be used to explain the correlation in the critical values x at which the interionic interac tion becomes important for the Cd1-xMnxTe and Cd1-xFexTe systems. (C) 1997 American Institute of Physics.