A calculation of the specific heat coefficients of alloys of Ni with Rh, Ru, Ir and Os

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Abstract
A calculation of the linear coefficient gamma of the low-temperature specific heat of the ferromagnetic alloys NiRh, NiRu, NiIr and NiOs is presented for various impurity concentrations. The discussion is based on previous calculations of the majority-spin density of states in these alloys. The calculated results for NiRh are in very reasonable agreement with experiment out to 20 or 30% concentration of impurity. The low concentration results for NiIr and NiOs are also in reasonable agreement with experiment. The calculated results of NiRu show a very rapid initial increase. The experimental results show a large initial increase of somewhat smaller magnitude. A discussion of the reason for this difference is given.