Relaxation of magnetization in spinel CuCrZrS _4

摘要

We studied time t dependence of magnetization M(t) of thiospinel CuCrZrS _4 which has a spin-glass freezing. The relaxation of M is observed below ~(Tf)?6K and shows a logarithmic time dependence. This means that a relaxation time τ of CuCrZrS _4 is distributed in a wide time range. Randomness of an arrangement of the Cr and Zr ions in CuCrZrS _4 probably gives rise to a distribution of τ. Temperature T dependence of magnetic viscosity β(T) is understood by a conventional after-effect model with a box-type distribution function of τ.