Local magnetization of Fe in Ag

The Mössbauer effect of ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ in Ag has been measured for $30 \mathrm{mK}<T<\mathrm{}60\mathrm{} \mathrm{K}$ in external fields up to 60 kG. The local susceptibility for $\mathrm{Ag}\mathrm{Fe}$ derived from the hyperfine fields shows a single Curie-Weiss behavior above 1 K with a Curie-Weiss temperature $\Theta =1.6\mathrm{}$ K. At lower temperatures the susceptibility levels off to a constant value in form of a $T^2$ law in agreement with recent theoretical expectations. The magnetization curves cannot be satisfactorily represented by a modified Brillouin function.