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

A strong effect of pressure on magnetization and paramagnetic moment of the Co-doped Mn-rich Ni_50-xCoxMn_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. [ABSTRACT FROM AUTHOR]