New measurements are reported which show substantial agreement with published values below 1K and above 15K, but very large differences at intermediate temperatures, the new values being smaller. Analysis of the results shows that (i) the hyperfine specific heat is consistent with the results of nuclear magnetic resonance experiments, (ii) the electronic specific heat coefficient gamma =10+or-0.2 mJ mol -1 K -2 , and (iii) the ferromagnetic-antiferromagnetic transition temperature is 19.2K. The temperature dependence of the magnetic specific heat below 7K appears to be anomalously rapid.
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Hill et al. (1984) studied this question.
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