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Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic Ni2MnGa
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We show that the magnetoelastic coupling between the magnetization and the amplitude of a short wavelength phonon enables the existence of a first order premartensitic transition from a bcc to a micromodulated phase in Ni2MnGa. Such a magnetoelastic coupling has been experimentally evidenced by ac susceptibility and ultrasonic measurements under an applied magnetic field. A latent heat around 9 J/mol has been measured using a highly sensitive calorimeter. This value is in very good agreement with the value predicted by a proposed model.
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PLANES VILA, Antoni, et al. Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic Ni2MnGa. Physical Review Letters. 1997. Vol. 79, num. 20, pags. 3926-3929. ISSN 0031-9007. [consulted: 28 of May of 2026]. Available at: https://hdl.handle.net/2445/12793