Planes Vila, AntoniObradó Llauradó, EduardGonzàlez Comas, AlfonsMañosa, Lluís2010-06-082010-06-0819970031-9007https://hdl.handle.net/2445/12793We 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.4 p.application/pdfeng(c) American Physical Society, 1997Equacions d'estatCiència dels materialsRegla de les fases i equilibriEquations of stateMaterials sciencePhase rule and equilibriuminfo:eu-repo/semantics/article147480info:eu-repo/semantics/openAccess