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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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Reproducció digital del document publicat en format paper, proporcionada per APS i http://dx.doi.org/10.1103/PhysRevLett.79.3926

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic Ni2MnGa