Ultrasonic attenuation studies in super-conducting lead
Randorff, Jack Edward
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Measurements of the attenuation of 10, 30, 50 and 70 MHz longitudinal sound waves, propagated in the ,  and  directions, have been conducted on the normal and superconducting states of high purity unstrained lead. Analysis of the data has been presented in such a manner as to allow for the possibility of multiple superconducting energy gaps. Our data indicate the existence of a secondary gap. The data have also been compared to theoretical calculations for both weak and strong coupling models. Measurements of the ultrasonic attenuation have also been conducted on a sample of strained lead for the  direction. Preliminary statements have been made with respect to strain effects and a simple descriptive model has been proposed.