ULTRASONIC ATTENUATION IN SUPERCONDUCTING ZINC.
Abstract
Measurements of the ultrasonic attenuation of 10 and 30 Mcs/sec longitudinal waves by pulsed-echo techniques were made on a 99.999% pure single crystal of superconducting zinc in the (0001) direction as a function of temperature from 4.2 K to 0.320 K using an open-ended type He-3 cryostat. The attenuation was found to be frequency dependent and decreased less sharply near the superconducting transition temperature than predicted by the Bardeen-Cooper Schrieffer (BCS) theory. Attenuation due to electron-phonon interactions only was found by subtracting from experimental points the value of residual attenuation gotten by extrapolation of the data to T = 0 K. Using the BCS theory the zero degree superconducting energy gap was determined. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0475352
Entities
People
- Joseph P. Goncz
Organizations
- Naval Postgraduate School