Universal Scaling of Spin-Glass Freezing Non-Linear and Dynamic Magnetization in CADMIUM(1-X)MANGANESE(X)TELLURIUM System.

Static low-field longitudinal magnetic susceptibility chi(T), non-linear magnetic susceptibility and the relaxation of the thermoremanent magnetization were determined by a SQUID susceptometer. The relaxation time measurement clearly show a low temperature glassy state with very long relaxation times, likewise a very rapid response above the critical temperature. Other archetypal spinglass (SG) ordering behaviors were also observed; as the peak in the magnetic susceptibility and its suppression with increasing magnetic field. The non-linear susceptibility exhibited a peak as a function of temperature. Several models predict such behavior as a manifestation of a true SG transition. The non-linear susceptibility did not satisfy simple scaling laws. Our analysis of the data permitted a unique characterization of the SG phase independent of the measurement field. Additionally in the glassy phase a novel reentrant spontaneous magnetization was observed. This and the singular non-linear response are the first such observation in any semimagnetic semiconductor.