Abstract
An effect of magnetic field on the martensitic transformation (MT) temperature in ferromagnetic shape memory Ni 49.4 Mn 27.7 Ga 22.9 single crystal with the MT temperature 285 K is studied by measuring and theoretical treatment of the magnetization versus temperature dependencies in a wide range of the high magnetic fields higher than saturating one. In this way, a linear approximation of the field dependence of MT temperature was proved for the high-field range. The linear increase of transformation temperature is characterized by the slope of 3.5 x 10 -2 K/kOe. This value is essentially larger than the value 2 x 10 -2 K/kOe reported by Gonzales-Comas et al. [Phys. Rev. B 60 (1999) 7085-7090] for the Ni 49.5 Mn 25.4 Ga 25.1 alloy with a low MT temperature. This difference is in an agreement with the predictions of the Landau theory.
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