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Electronic instabilities in shape-memory alloys: Thermodynamic and electronic structure studies of the martensitic transition
Lashley, JC Schulze, RK Mihaila, B Hults, WL Cooley, JC Smith, JL Riseborough, PS Opeil, CP Fisher, RA Svitelskiy, O
Lashley, JC
Schulze, RK
Mihaila, B
Hults, WL
Cooley, JC
Smith, JL
Riseborough, PS
Opeil, CP
Fisher, RA
Svitelskiy, O
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Journal Article
Date
2007-05-22
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10.1103/PhysRevB.75.205119
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. © 2007 The American Physical Society.
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Physical Review B - Condensed Matter and Materials Physics
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