Magnetocaloric Effect of Mn2YSn (Y = Sc, Ti, V) Alloys

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Abstract—

In this paper, the structural, magnetic, and thermodynamic properties of Mn2YSn (Y = Sc, Ti, and V) alloys are considered depending on the applied pressure using the density functional theory and the Monte Carlo method. It is shown that for each compound there are two magnetic states with a low and a high magnetic moment at a smaller and larger unit cell volume, separated by an energy barrier. The barrier value depends on the applied external pressure. The two phases become almost equal in energy at critical pressures of 3.4, –2.9, and –3.25 GPa for Mn2ScSn, Mn2TiSn, and Mn2VSn, respectively. The temperature behavior of the magnetization and magnetocaloric characteristics for the studied phases at various pressures is obtained. Accounting for pressure leads to an understanding of the mechanism of the increase in the magnetocaloric effect in the phase with a high magnetic moment. The greatest effect (ΔSmag ≈ 0.158 J/mol K and ΔTad ≈ 1.1 K) is predicted for Mn2TiSn at a pressure of –2.9 GPa and a change in the magnetic field from 0 to 2 T.

作者简介

V. Sokolovskiy

Chelyabinsk State University

Email: miczag@mail.ru
Russia, 454001, Chelyabinsk

M. Zagrebin

Chelyabinsk State University

编辑信件的主要联系方式.
Email: miczag@mail.ru
Russia, 454001, Chelyabinsk

V. Buchelnikov

Chelyabinsk State University

Email: miczag@mail.ru
Russia, 454001, Chelyabinsk

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版权所有 © В.В. Соколовский, М.А. Загребин, В.Д. Бучельников, 2023

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