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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

Physical review. B, Condensed matter, 2001

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Título:
Phonon softening in Ni-Mn-Ga alloys
Autor: Mañosa, Lluís ; Planes Vila, Antoni ; Zarestky, Jerel L ; Lograsso, T. A ; Schlagel, D. L ; Stassis, C
Assuntos: Aliatges ; Alloys ; Dispersió (Física nuclear) ; Fonons ; Phonons ; Scattering (Physics)
É parte de: Physical review. B, Condensed matter, 2001
Descrição: 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.
Editor: The American Physical Society
Idioma: Inglês

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