Title:
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Phonon softening in Ni-Mn-Ga alloys
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Author:
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Mañosa, Lluís; Planes Vila, Antoni; Zarestky, Jerel L.; Lograsso, T. A.; Schlagel, D. L.; Stassis, C.
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Dispersió (Física nuclear) -Fonons -Aliatges -Scattering (Physics) -Phonons -Alloys |
Rights:
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(c) The American Physical Society, 2001
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Document type:
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Article Article - Published version |
Published by:
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The American Physical Society
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