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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. Dispersió (Física nuclear) Fonons Aliatges Scattering (Physics) Phonons Alloys 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. 2009-12-24T10:45:46Z 2009-12-24T10:45:46Z 2001 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.64.024305 Physical Review B, 2001, vol. 64, núm. 2, p. 024305(1)-024305(6) http://dx.doi.org/10.1103/PhysRevB.64.024305 (c) The American Physical Society, 2001 info:eu-repo/semantics/openAccess The American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)