Effect of hydrostatic pressure Ni2+xMn1-xGa on magnetization of alloys

The effect of pressures up to 1.2 GPa on saturated magnetization M-S of Ni2+xMn1-xGa (0 <= x <= 0.2) alloys has been studied at temperatures from 5 to 400 K. The pressure parameter, din Ms/dp at 5 K, varies from -0.3 x 10(-2) GPa(-1) up to -1.3 x 10(-2) GPa(-1). At temperature T-M of martensitic transition (MT), dln M-S/dp changes its sign. M-S and the Curie temperature T-C of the cubic phase of compounds increase with increasing pressure. These results are consistent with a theoretical picture of band structure of Ni2MnGa assuming a broadening and a depletion of the dominant minority Ni e. band under pressure. (c) 2004 Elsevier B.V. All rights reserved.