The specific heat of single crystals of europium gallium garnet (EuGaG) and dysprosium gallium garnet (DyGaG) and of a sintered polycrystalline sample of praseodymium gallium garnet (PrGaG) has been measured between 0.4 and 90^∘{}K. For EuGaG the results can be described by the lattice contribution alone between 2 and 55^∘{}K. Schottky anomalies observed in PrGaG and DyGaG are explained by crystal-field splittings, with the best fit in both cases being obtained with a Gaussian distribution of energy levels rather than single values. In DyGaG anomalies below 2^∘{}K suggest a possible reassignment of crystal-field levels, and magnetic ordering below 0.4^∘{}K.
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Goshorn et al. (1977) studied this question.
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