Abstract:
This paper presents the results of an experimental study of the magnetization $(M)$ and heat capacity (CP) of polycrystalline samples Ni$_{49.3}$Mn$_{40.4}$In$_{10.3}$, Ni$_{45.48}$Mn$_{40.52}$In$_{14}$, Ni$_{46.78}$Mn$_{38.42}$In$_{14.8}$, Ni$_{41}$Mn$_{40.5}$In$_{18.5}$ of the Heusler alloys in the temperature range of 4 – 350 K. The obtained curves exhibit anomalies corresponding to magnetostructural (if any) and magnetic phase transitions. From the analysis of the low-temperature dependence of the heat capacity, the electron contributions to the heat capacity, the Debye temperatures $(\theta_{\mathrm{D}})$ and the density of electron states at the Fermi level of the studied samples were obtained. It was found that the Debye temperature (301 – 384 K) is an increasing function of $e/a$.
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