Eur. Phys. J. B 67, 193-196 (2009)
https://doi.org/10.1140/epjb/e2009-00023-9

Martensitic transition and inverse magnetocaloric effect in Co doping Ni–Mn–Sn Heulser alloy

Department of Physics, Shanghai University, 200444, Shanghai, P.R. China

Corresponding author: ^a cjing@staff.shu.edu.cn

Received: 6 October 2008
Revised: 15 December 2008
Published online: 22 January 2009

Abstract

We presented the martensitic transition and magnetocaloric effect of the substituted Heulser alloy Ni_50-xCo_xMn₃₈Sn₁₂ (x = 2, 4, and 6). A large magnetic entropy change of 37.1 J/kg K above room temperature for a magnetic field change of 50 kOe is obtained in Ni₄₈Co₂Mn₃₈Sn₁₂ alloy. With the increase of Co concentration, the martensitic transition shifts to lower temperature and the magnetic entropy change decreases. This behavior could be ascribed by the fact that the FM exchange coupling is enhanced much more with increasing Co content.