Magnetic susceptibility studies of Zn1-xFexSe and Zn1-xFexS

The magnetic susceptibility of diluted magnetic semiconductors Zn1-xFexSe a nd Zn1-xFexS has been calculated within a crystal field model and by applyi ng the extended nearest-neighbour pair approximation. The results are compa red with available experimental data. It appears that a good agreement betw een theory and experiment is obtained for Zn1-xFexSe laking the long-range exchange comprising several nearer interionic distances, whereas in Zn1-xFe xS the exchange interaction with nearest-neighbours alone gives a better so lution. (C) 1999 Elsevier Science B.V. All rights reserved.