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Low-temperature heat capacity of the Ni-Mn-In Heusler alloys
Russian version
Khanov L. N.1, Kadirbardeev A.T.1, Mashirov A. V.2, Aliev A. M.1
1Amirkhanov Institute of Physics, Daghestan Federal Research Center, Russian Academy of Sciences, Makhachkala, Russia
2Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia
Email: hanov82@mail.ru
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This paper presents the results of an experimental study of the magnetization (M) and heat capacity (CP) of polycrystalline samples Ni49.3Mn40.4In10.3, Ni45.48Mn40.52In14, Ni46.78Mn38.42In14.8, Ni41Mn40.5In18.5 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 (thetaD) 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. Keywords: Heusler alloys, helium temperatures, Debye temperature, phase transitions, magnetization.
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