Magnetization ofHg1−xMnxTe

The magnetization of ${\mathrm{Hg}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$Te for x values from 0.007 to 0.23 has been measured over a temperature range from about 2 to 25 K and in magnetic fields from 3 Oe to 40 kOe. The results for each x value can be well described by a modified Brillouin function with two fitting parameters x¯ and $T_0$. The temperature dependence of the low-field susceptibility is proportional to $T^{\alpha \left(x\right)}$, where -1≤α(x)≤0. Models based on random-exchange interactions predict such a power-law dependence.