An approximate equation of state is proposed for ferromagnets, with a particular reference to magnetic refrigerants such as gadolinium. The equation applies for TTC and an arbitrary magnetic field and is based on Landau's theory of second-order phase transitions, with Bloch's 3/2 power law built in one of Landau's coefficients. The displacement of the maximum in the specific heat under an applied magnetic field is demonstrated to be nonmonotonic: the maximum shifts toward lower temperatures in a weak field but toward higher temperatures in a strong field.
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M. D. Kuz’min (2008) studied this question.
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