Direct evidence of the magnetoelastic interaction in Ni2MnGa magnetic shape memory system

作者：Recarte V^*; Perez Landazabal J I; Sanchez Alarcos V; Cesari E; Jimenez Ruiz M; Schmalzl K; Chernenko V A

来源：Applied Physics Letters, 2013, 102(20): 201906.

DOI：10.1063/1.4807737

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 zeta approximate to 0.33. Furthermore, an enhancement of the long-wavelength limit (C%26apos;) of this branch with the applied magnetic field has been observed. Both results evidence a strong magnetoelastic interaction at the intermediate transition.

• 出版日期2013-5-20