Phonon softening in Ni-Mn-Ga alloys
作者： Lluís Mañosa , Antoni Planes , J. Zarestky , T. Lograsso , D. L. Schlagel
DOI: 10.1103/PHYSREVB.64.024305
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摘要: The TA2 phonon dispersion curves of Ni-Mn-Ga alloys with different compositions which transform to martensitic structures have been measured over a broad temperature range covering both paramagnetic and ferromagnetic phases. branches show an anomaly ~dip! at wave number that depends on the particular structure, there is softening these anomalous phonons decreasing temperature. This enhanced below Curie point, as consequence spin-phonon coupling. effect stronger for systems higher electronic concentration.
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