Magnetic properties of single crystals ${\mathrm{Cd}}_{1-x}{\mathrm{Mn}}_x\mathrm{Te}$ ($0.05<~x<~0.5$) have been studied. The low-field susceptibility has been measured for temperatures ranging from 0.07 to 30 K, and is compared with high-field magnetization data. It is shown that these semimagnetic semiconductors do not behave like canonical spin-glasses. A detailed analysis of the data based on a magnetic-cluster description of mictomagnetic alloys is presented. Some features, such as the particular $x$ dependence of the freezing temperature and the coexistence of infinite and finite spin clusters in a definite range of concentrations $x$ above the percolation threshold, are correlated to the short-range nature of the exchange interaction between Mn ions.

• Received 9 November 1981

DOI:https://doi.org/10.1103/PhysRevB.25.4674