SPIN-GLASS DYNAMICS IN SEMIMAGNETIC SEMICONDUCTORS

Magnetooptic methods hare been used to study the critical dynamics in concentrated Cd1-xMnxTe compounds (0.3 less than or equal to x less th an or equal to 0.5). The occurence of a spin glass phase transition at finite T-c has been characterized by the observation of the dynamic s caling laws : An unique scaling function with identical critical expon ents whatever the Mn composition support the existence of universality among these spin glasses. The critical dynamic behavior is very simil ar to that found in insulating Ising spin systems.