Electronic Instabilities in Shape-Memory Alloys

J. C. Lashley; R. K. Schulze; B. Mihaila; W. L. Hults; J. L. Smith; P. S. Risenborogh; C. P. Opeil; R. A. Fisher; O. Svietelskiy; A. Suslov; A. Planes; L. Manosa; T. R. Finlayson

doi:10.1103/physrevb.75.205119

arXiv · cond-mat/0607275

Electronic Instabilities in Shape-Memory Alloys

J. C. Lashley·R. K. Schulze·B. Mihaila·W. L. Hults·J. L. Smith·P. S. Risenborogh·C. P. Opeil·R. A. Fisher·O. Svietelskiy·A. Suslov·A. Planes·L. Manosa·T. R. Finlayson

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Abstract

Using a variety of thermodynamic measurements made in magnetic fields, we show evidence that the diffusionless transition (DT) in many shape-memory alloys is related to significant changes in the electronic structure. We investigate three alloys that show the shape-memory effect (In-24 at.% Tl, AuZn, and U-26 at.% Nb). We observe that the DT is significantly altered in these alloys by the application of a magnetic field. Specifically, the DT in InTl-24 at.% shows a decrease in the DT temperature with increasing magnetic field. Further investigations of AuZn were performed using an ultrasonic pulse-echo technique in magnetic fields up to 45 T. Quantum oscillations in the speed of the longitudinal sound waves propagating in the [110] direction indicated a strong acoustic de Haas-van Alphen-type effect and give information about part of the Fermi surface.

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J. C. Lashley, R. K. Schulze, B. Mihaila, W. L. Hults, J. L. Smith, P. S. Risenborogh, C. P. Opeil, R. A. Fisher, O. Svietelskiy, A. Suslov, A. Planes, L. Manosa, T. R. Finlayson. 2007-03-20. Electronic Instabilities in Shape-Memory Alloys. https://doi.org/10.1103/physrevb.75.205119

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