Catastrophic Fermi surface reconstruction in the shape-memory alloy AuZn

Abstract

AuZn undergoes a shape-memory transition at 67 K. The de Haas van Alphen effect persists to 100 K enabling the observation of a change in the quantum oscillation spectrum indicative of a catastrophic Fermi surface reconstruction at the transition. Coexistence of both Fermi surfaces at low temperatures is suggestive of an intrinsic phase separation in the bulk of the material. In addition, a Dingle analysis reveals a sharp change in the scattering mechanism at a threshold cyclotron radius, which we suggest to be related to the underlying microstructure that drives the shape-memory effect.

4 pages, 4 figures

References in corpus (2)

• Fermi Surface as a Driver for the Shape-Memory Effect in AuZn
• Elastic and thermodynamic properties of the shape-memory alloy AuZn

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