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Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic Ni2MnGa
Planes Vila, Antoni; Obradó Llauradó, Eduard; Gonzàlez Comas, Alfons; Mañosa, Lluís
Universitat de Barcelona
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.
2010-06-09
Equacions d'estat
Ciència dels materials
Regla de les fases i equilibri
Equations of state
Materials science
Phase rule and equilibrium
(c) American Physical Society, 1997
Article
American Physical Society
         

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