DYNAMIC CRITICAL-BEHAVIOR OF THE CDCR2X0.85IN2X0.15S4 SPIN-GLASS

We have measured the ac magnetic susceptibility of the CdCr//2// multiplied by //0//. //8//5In//2// multiplied by //0//. //1//5S//4 insulating spin-glass over the 1 Hz-100 kHz frequency range, for several values of an additional static magnetic field. Characteristic temperatures T//f(H, omega ) are obtained, and analyzed in a dynamic scaling approach. Although compatible with T//c equals 0, our results favour a transition at T//c congruent 16. 7 with zv congruent 7. The determination of the scaling function yields beta plus gamma congruent 3. 5.