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Title: Anomalies related to the TA2 phonon mode condensation in the Heusler Ni2MnGa alloy
Author: Mañosa, Lluís
Gonzàlez Comas, Alfons
Obradó Llauradó, Eduard
Planes Vila, Antoni
Chernenko, V. A.
Kokorin, V. V.
Cesari, Eduard
Keywords: Materials magnètics
Propietats magnètiques
Transformacions martensítiques
Magnetic materials
Magnetic properties
Martensitic transformations
Issue Date: 1997
Publisher: The American Physical Society
Abstract: We present specific-heat, elastic constants, and magnetic susceptibility measurements in a ferromagnetic Ni 2 MnGa Heusler alloy, in a temperature range where partial condensation of the [110] TA 2 phonon at q=0.33, accompanied by the development of a micromodulated structure has been reported to occur. All these quantities have been found to exhibit anomalous behavior at the temperature of condensation. From the results presented, it can be concluded that the appearance of the micromodulated structure takes place via a phase transition which is very weakly first order. It is found that at the transition point there is a significant reduction of the dynamical stability of the lattice not just for the transverse phonon at q=0.33, but also for any shear long wavelength distortion. It is particularly remarkable the large softening of C′ (around 60%) at the transition point. Finally, it is also shown that the intermediate transition is related to a magnetoelastic interaction.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 1997, vol. 55, núm. 17, p. 11068-11071
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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