The M\"ossbauer effect of Cu:Fe has been measured for 30 mK<T<100 K in external fields up to 60 kg. A constant temperature-independent term is subtracted from the hyperfine fields. After this correction the local susceptibility is in agreement with bulk magnetization, neutron diffraction, and NMR data. At the very lowest temperatures the local susceptibility becomes temperature independent, in agreement with theoretical expectations.
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Steiner et al. (1974) studied this question.
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