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Hydrostatic pressure effect on the martensitic transition, magnetic, and magnetocaloric properties in Ni50-xMn37+xSn13 Heusler alloys

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6 Author(s)
Esakki Muthu, S. ; Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli–620024, India ; Rama Rao, N. V. ; Manivel Raja, M. ; Arumugam, S.
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We report upon the effect of hydrostatic pressure on the martensitic transition, magnetic properties, and magnetic entropy change in Ni50-xMn37 + xSn13 (x = 2, 3) Heusler alloys. The application of pressure has significantly shifted the martensitic transition temperature to higher values. A large rate of change of the martensitic transition with a pressure of ∼3.1 K/kbar has been obtained for the x = 2 alloy, whereas the Curie temperature changes marginally with pressure (∼0.3 K/kbar). Magnetization of both the austenite and martensite phases decreases with an increase of pressure. The maximum magnetic entropy change of 34 J kg-1K-1 at ambient pressure and 22.5 J kg-1K-1 at 8 kbar was observed around the martensitic transition temperature for the x = 3 alloy.

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Journal of Applied Physics  (Volume:110 ,  Issue: 8 )