Abstract
The specific heats of metallic Ho and Tb have been measured between 0.03 and 0.5\ifmmode^\circ\else\textdegree\fi{}K, 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 ${a}^{\ensuremath{'}}=+0.319\ifmmode^\circ\else\textdegree\fi{}$K and ${a}^{\ensuremath{'}}=+0.149\ifmmode^\circ\else\textdegree\fi{}$K, and electric quadrupole coupling constants $P=+0.004\ifmmode^\circ\else\textdegree\fi{}$K and $P=+0.0158\ifmmode^\circ\else\textdegree\fi{}$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.
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