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Premartensitic and martensitic phase transitions in ferromagnetic Ni2MnGa
Gonzàlez Comas, Alfons; Obradó Llauradó, Eduard; Mañosa, Lluís; Planes Vila, Antoni; Chernenko, V. A.; Hattink, Bart Jan; Labarta, Amílcar
Universitat de Barcelona
We present an experimental study of the premartensitic and martensitic phase transitions in a Ni2MnGa single crystal by using ultrasonic techniques. The effect of applied magnetic field and uniaxial compressive stress has been investigated. It has been found that they substantially modify the elastic and magnetic behavior of the alloy. These experimental findings are a consequence of magnetoelastic effects. The measured magnetic and vibrational behavior agrees with the predictions of a recently proposed Landau-type model [A. Planes et al., Phys. Rev. Lett. 79, 3926 (1997)] that incorporates a magnetoelastic coupling as a key ingredient.
2010-05-04
Equacions d'estat
Transformacions martensítiques
Equations of state
Martensitic transformations
(c) The American Physical Society, 1999
Article
The American Physical Society
         

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