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Phonon softening in Ni-Mn-Ga alloys
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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.
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MAÑOSA, Lluís, et al. Phonon softening in Ni-Mn-Ga alloys. Physical Review B. 2001. Vol. 64, num. 2, pags. 024305(1)-024305(6). ISSN 0163-1829. [consulted: 7 of October of 2026]. Available at: https://hdl.handle.net/2445/10500