Ultrasonic attenuation in superconductors: theory of the effect of 'Andreev' scattering
- 1 July 1973
- journal article
- Published by IOP Publishing in Journal of Physics F: Metal Physics
- Vol. 3 (7), 1429-1437
- https://doi.org/10.1088/0305-4608/3/7/019
Abstract
The effect on ultrasonic attenuation in superconductors of 'Andreev' scattering-the scattering of electronic excitation by spatial variations of the order parameter is investigated. The result at small ql (q is the sound wavevector and l the electron mean free path) agrees with previous theoretical work, whereas that at large ql shows a new and unusual dependence of attenuation on Andreev and impurity scattering rates. The applicability of this theory to clean type II superconductors near Hc1 and Hc2 is discussed.Keywords
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