Attenuation of longitudinal sound in superconductors
Abstract
A free electron model based on a gauge-invariant system of equations is used to investigate the attenuation of longitudinal sound waves in superconducting alloys. This attenuation is due to Joule losses associated with the presence of macroscopic electromagnetic fields. The Hamiltonian for the interaction between electrons and longitudinal sound waves and between electrons and traveling impurities is considered for an isotropic superconductor. It is shown that in the low frequency range the acoustic attenuation coefficient, conditioned by electric fields, is different from the BCS formula.
- Publication:
-
Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki
- Pub Date:
- October 1975
- Bibcode:
- 1975ZhETF..69.1267V
- Keywords:
-
- Acoustic Attenuation;
- Electron Phonon Interactions;
- Longitudinal Waves;
- Sound Transmission;
- Superconductors;
- Bcs Theory;
- Free Electrons;
- Gauge Invariance;
- Green'S Functions;
- Hamiltonian Functions;
- Mathematical Models;
- Ohmic Dissipation;
- Solid-State Physics