Influence of the Mn2+ ion cluster formation on the EPR spectrum of Zn1-xMnxTe
The second and fourth central moments of the EPR line of the Mn2+ ion clusters are calculated for the case when isotropic and anisotropic superexchange interactions exist between paramagnetic ions. The infinite-temperature linewidth for each type of the cluster is found taking Lorentzian lineshape function. Using cluster-method calculations of central moments, infinite-temperature EPR linewidth in Zn1-xMnxTe is evaluated for x less than or equal to 0.20, and the results are compared with the theory of the EPR line broadening developed for randomly diluted magnetic semiconductors. The cluster-method approach to the EPR linewidth offers an explanation of the narrow resonance observed in Zn1-xMnxTe for x GT 0.20. (C) 1996 Academic Press, Inc.