Abstract
The martensitic transformation in stoichiometric Ni2MnGa alloys is preceded by a weakly first order transformation from a high temperature cubic phase to a near-cubic modulated intermediate phase related to the presence of a soft phonon mode. This transformation has been proposed to appear as a consequence of the magnetoelastic coupling. Inelastic neutron scattering experiment performed under external magnetic field shows a temperature shift of the characteristic energy dip at ζ ≈ 0.33. Furthermore, an enhancement of the long-wavelength limit (C′) of this branch with the applied magnetic field has been observed. Both results evidence a strong magnetoelastic interaction at the intermediate transition.
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