Document Type

Article

Publication Date

6-21-2001

Journal or Book Title

Physical Review B

Volume

64

Issue

21

First Page

024305

DOI

10.1103/PhysRevB.64.024305

Abstract

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.

Comments

This article is from Physical Review B 64 (2001): 024305, doi:10.1103/PhysRevB.64.024305.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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