PHASE-TRANSITION SPIN GLASS-LONG MAGNETIC ORDER IN NEW THIOSPINELS CONTAINING CU, CR AND SB

The reentrant spin-glass transition was found in the samples of solid solutions CuCr1.5+0.5x Sb0.5-0.5xS4 with x = 0.34 and 0.4. The transit ion temperature to tile spin-glass state T-f, determined from the bend on the temperature dependence of the initial susceptibility in an ac magnetic field, depends on the measurement frequency. It was shown tha t the dependence T-f(omega) obeys the power law 1/omega = (1/omega(0)) [T-f/(T-f-T)](zv) assuming existence of the phase transition at T*. T he maximum of the temperature dependence of electroresistivity was fou nd for the sample with x = 0.34 in T region. These facts show that co nsidered spin-glass-long magnetic order transition is the phase transi tion.