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 CuCr$\text{}_{1.5+0.5x}$Sb$\text{}_{0.5-0.5x}$S$\text{}_{4}$ with x=0.34 and 0.4. The transition temperature to the spin-glass state T$\text{}_{f}$, 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 that the dependence T$\text{}_{f}$(ω) obeys the power law 1/ω=(1/ω$\text{}_{0}$)[T$\text{}_{f}$/(T$\text{}_{f}$ - T*)]$\text{}^{zν}$ assuming existence of the phase transition at T*. The maximum of the temperature dependence of electroresistivity was found for the sample with x=0.34 in T* region. These facts show that considered spin-glass-long magnetic order transition is the phase transition.