Catastrophic Fermi surface reconstruction in the shape-memory alloy AuZn

Details Catastrophic Fermi surface reconstruction in the shape-memory alloy AuZn Catastrophic Fermi surface reconstruction in the shape-memory alloy AuZn

2005-01-06

arxiv.org/abs/cond-mat/0501108v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.116401

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.

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