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A relation between the temperature dependence of the energies of short-wavelength magnons and the heat capacity is presented. This relation, which has no adjustable parameters, is in perfect agreement with all available data for T0.7TN. For NiF₂, agreement is up to TN. The relation can be used to determine the magnon contributions to the heat capacity of magnetic solids.
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Pershan et al. (1970) studied this question.
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