Abstract
Ni-51.5 Mn-23 M-2 Ga-23.5 materials are to reveal the dopant effect on the martensitic transition and the magnetic properties. We found that the dopants Ti, Zr, Hf, V, Nb, and Ta lower the martensitic transition temperature of the sample, but W increases it. The martensitic transition temperature is very sensitive to the atomic size when the valence electronic concentration keeps constant for the doping elements. The dopants Ti, Zr, Hf or V decrease the magnetic moment of Mn atom in the martensite at low temperature, while Nb, Ta or W enhance it. A corresponding variation of T-C of the materials is not observed, which indicates that the influence of the lattice change of martensitic transition on the magnetic properties should also be talken into account.