Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic $Ni_{2}MnGa$

Details Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic $Ni_{2}MnGa$ Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic $Ni_{2}MnGa$

1997-09-23

arxiv.org/abs/cond-mat/9709246v1

Physics

Condensed Matter

Materials Science

4 pages RevTex, 3 Postscript figures, to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.79.3926

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 $Ni_{2}MnGa$. Such a magnetoelastic coupling has been experimentally evidenced by AC susceptibility and ultrasonic measurements under 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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