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Article Dans Une Revue Journal of Superconductivity and Novel Magnetism Année : 2020

Structure, Magnetocaloric Effect and Critical Behaviour in Ni50Mn30(Sn,In)20 Heusler Alloys

Résumé

A detailed investigation of structure, critical behaviour and magnetocaloric properties of Ni50Mn30Sn20 (Sn20) and Ni50Mn30In20 (In20) alloys has been investigated by means of X-ray diffraction and magnetic measurements. Ni50Mn30Sn20 alloy shows a cubic austenite L21 structure and undergoes a second order magnetic transition at a Curie temperature of . However, the Ni50Mn30In20 alloy exhibits a mixture of cubic L21 and B2 austenite structures having Curie temperatures of and , respectively. The modified Arrott plots, Kouvel-Fisher curves and critical isotherm analysis have been used to estimate the critical exponents (β, γ and δ) around the Curie temperature. For Sn20 alloy, the reliable exponents are consistent with the mean field model, revealing long-range ferromagnetic interactions. Nevertheless, the critical exponents of In20 alloy around 330 K cannot be arranged into any of the universality classes of well-known classical standard models. The maximum entropy change under 5 T of Sn20 () is slightly higher than that of In20 (). The experimental results of entropy changes are in good agreement with those calculated using Landau theory.
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hal-04256425 , version 1 (24-05-2024)

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Karima Dadda, Safia Alleg, Joan Josep Suñol, Lotfi Bessais, El Kebir Hlil. Structure, Magnetocaloric Effect and Critical Behaviour in Ni50Mn30(Sn,In)20 Heusler Alloys. Journal of Superconductivity and Novel Magnetism, 2020, 33 (7), pp.2209-2218. ⟨10.1007/s10948-020-05485-3⟩. ⟨hal-04256425⟩
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