arXiv subjects

Lluis Manosa

Publications and source records attributed to Lluis Manosa.

20 records · Page 2Linked to original sources

arXiv2001

On the athermal character of structural phase transitions

The significance of thermal fluctuations on nucleation in structural first-order phase transitions has been examined. The prototype case of martensitic transitions has been experimentally investigated by means of acoustic emission techniques. We propose a model based on the mean first-passage time to account for the experimental observations. Our study provides a unified framework to establish the conditions for isothermal and athermal transitions to be observed.

cond-mat.mtrl-sci↗

arXiv1997

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

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.

cond-mat.mtrl-sci↗