EPJ Web of Conferences 40, 11002 (2013)
https://doi.org/10.1051/epjconf/20134011002

Pressure dependence of magneto-structural properties of Co-doped off-stoichiometric Ni₂MnGa alloys

¹ Institute of Physics ASCR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic
² IMEM CNR, Parco Area delle Scienze 37/A, I-43124 Parma, Italy
³ Dipartimento di Chimica GIAF, Universita di Parma, Viale G. Usberti 17/A, I-43100 Parma, Italy

Abstract

A strong effect of pressure on magnetization and paramagnetic moment of the Co-doped Mn-rich Ni_50-xCo_xMn_25+yGa_25-y (x = 5,7,9 and y = 5,6,7,8) Heusler alloys is presented and compared with very weak pressure sensitivity of magnetization of the stoichiometric Ni₂MnGa alloy. The effects of both, the pressure and the magnetic field, on temperature of the structural martensitic transition in the alloys are discussed with a use of the Clausius-Clapeyron relations. An analysis of pressure and field effects provides a possibility to evaluate structural and magnetic parts of latent heat of the martensitic transitions in the studied alloys. The Curie temperature of martensite phase of the Co-rich alloys is not affected by pressure.