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The specific heats of metallic Ho and Tb have been measured between 0. 03 and 0. 5^, a temperature range in which the nuclear (hyperfine) heat capacity predominates. The data are fitted with theoretical Schottky curves, using magnetic dipole hyperfine-interaction parameters a^'=+0. 319^K and a^'=+0. 149^K, and electric quadrupole coupling constants P=+0. 004^K and P=+0. 0158^K for Ho and Tb, respectively. For Tb, these values are in agreement with the parameters obtained from nuclear-magnetic-resonance measurements. An earlier suggestion by the present authors that a cooperative nuclear-nuclear interaction might be present in Tb is here shown to have been based on an erroneous temperature scale. A detailed description of the calorimeter is presented.
Krusius et al. (Fri,) studied this question.