Phonon softening in Ni-Mn-Ga alloys -: art. no. 024305

被引：91

作者：

Mañosa, L

Planes, A

Zarestky, J

Lograsso, T

Schlagel, DL

Stassis, C

机构：

[1] Univ Barcelona, Dept Estructura & Constituents Mat, Fac Fis, E-08028 Barcelona, Spain

[2] Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA

[3] Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.64.024305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The TA(2) 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.

引用

页数：6

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