Electronic Instabilities in Shape-Memory Alloys

Details Electronic Instabilities in Shape-Memory Alloys Electronic Instabilities in Shape-Memory Alloys

2006-07-11

arxiv.org/abs/cond-mat/0607275v3

Phys. Rev. B 75, 205119 (2007)

Physics

Condensed Matter

Other Condensed Matter

5 figures

Scientific paper

10.1103/PhysRevB.75.205119

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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