Abstract
We have measured high resolution Compton scattering profiles for momentum transfer along a series of 28 independent directions from Cu0.842Al0.158 disordered alloy single crystals with normals to the surfaces oriented along the [100], [110], and [111] directions. The experimental spectra are interpreted via parallel first-principles KKR-CPA (Korringa-Kohn-Rostoker coherent-potential approximation) computations of these directional profiles. The Fermi surface determined by inverting the Compton data is found to be in good agreement with the KKR-CPA predictions. An electron diffraction study of the present Cu0.842Al0.158 sample is additionally undertaken to gain insight into short-range ordering effects. The scattering pattern displays not only the familiar diffuse scattering peaks, but also shows the presence of weak streaks interconnecting the four diffuse scattering spots around the (110) reciprocal lattice points. This study provides a comprehensive picture of the evolution of the shape of the Fermi surface of Cu with the addition of Al. Our results are consistent with the notion that Fermi surface nesting is an important factor in driving short-range ordering effects in disordered alloys.
Keywords
Compton scattering, Fermi surface, disordered alloys
Subject Categories
Fermi surfaces, Scattering (Physics), Alloys, Electrons - Diffraction
Disciplines
Physics
Publisher
American Physical Society
Publication Date
8-23-2004
Rights Information
Copyright 2004 American Physical Society.
Rights Holder
American Physical Society
Recommended Citation
Kwiatkowska, J.; Maniawski, F.; Matsumoto, I.; Kawata, H.; Shiotani, N.; Lityriska, L.; Kaprzyk, S.; and Bansil, A., "Fermi surface of a disordered Cu-Al-alloy single crystal studied by high-resolution Compton scattering and electron diffraction" (2004). Physics Faculty Publications. Paper 385.
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Notes
Originally published in Physical Review B v.70 (2004): 075106. DOI: 10.1103/PhysRevB.70.075106