We developed a new magnetic material R3T system, where R is a rare earth metal and T a transition metal, used as a regenerator matrix in a conventional two-stage Gifford-McMahon (GM) type cryocooler. These compounds, especially Er3Ni (Erbium 3 Nickel), possess extremely large heat capacities between 4 K and room temperature because of their low Debye temperatures, about 150 K, and broadened large peaks in specific heat due to complicated ferromagnetic or antiferromagnetic spin configurations near each transition temperature, for instance 7 K for Er3Ni.
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Sahashi et al. (1990) studied this question.