Ultrasonic attenuation in superconducting zinc
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Authors
Goncz, Joseph P.
Subjects
Advisors
Neighbors, John R.
Date of Issue
1965
Date
1965
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
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 He3 cryostat. The attenuation was found to be frequency dependent and decreased less sharply near the superconducting transition temperature, Tc, 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 found to be 2 €(0)= (3.36 + 0.13)kTc with Tc = 0.817°K.
Type
Thesis
Description
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funding
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.