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Phonon softening in Ni-Mn-Ga alloys
Mañosa, Lluís; Planes Vila, Antoni; Zarestky, Jerel L.; Lograsso, T. A.; Schlagel, D. L.; Stassis, C.
Universitat de Barcelona
The TA2 phonon dispersion curves of Ni-Mn-Ga alloys with different compositions which transform to different martensitic structures have been measured over a broad temperature range covering both paramagnetic and ferromagnetic phases. The branches show an anomaly (dip) at a wave number that depends on the particular martensitic structure, and there is softening of these anomalous phonons with decreasing temperature. This softening is enhanced below the Curie point, as a consequence of spin-phonon coupling. This effect is stronger for systems with higher electronic concentration.
04-05-2010
Dispersió (Física nuclear)
Fonons
Aliatges
Scattering (Physics)
Phonons
Alloys
(c) The American Physical Society, 2001
Artículo
The American Physical Society
         

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