Deviations from the BCS expression for the acoustic attenuation in an anisotropic superconductor
E. V. Bezuglyı̆Physicotechnical Institute of Low Temperatures , Academy of Sciences of the Ukrainian SSR,В. И. ДенисенкоPhysicotechnical Institute of Low Temperatures , Academy of Sciences of the Ukrainian SSR,A. M. StepanenkoPhysicotechnical Institute of Low Temperatures , Academy of Sciences of the Ukrainian SSR,V. D. FilPhysicotechnical Institute of Low Temperatures , Academy of Sciences of the Ukrainian SSR,
ABI
Abstract
It is shown, both theoretically and experimentally, that during the superconducting transition in a metal with an anisotropic dispersion curve for the electrons regions of a rapid drop of the acoustic absorption may be preceded by its increase. Such a qualitative difference from the behavior characteristic of the well known BCS expression is due to an energy dependence of the velocity of the excitations in a superconductor if the Fermi surface contains flattened spots. In that case the temperature dependence of the acoustic velocity is signficantly modified as well.
Topics
Identifiers
Citations and references
Cited by 02 references
Metrics — AkademScholar · Coming soon