Publication:
Superconducting characteristics of thin tin films in contact with copper films

Loading...
Thumbnail Image
Authors
Hannum, Charles Ray.
Wyatt, Raymond E.
Subjects
Advisors
Cooper, J.N.
Date of Issue
1963
Date
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
Abstract
Copper films of calculated thicknesses between 200 and 500° have been evaporated on tin films about 1000 and 2000° thick and the superconducting properties studied. In every case, the critical current for the coated specimen was reduced substantially from the value for an identical tin specimen without copper. In general, the critical current rises relatively slowly as the temperature is decreased. However, at temperatures around 3.0°K and just below 2.3°K, the critical current increases relatively sharply with reduction of temperature. For the thinnest copper coatings, there was no reduction of critical temperature, possibly because the copper film may not have been continuous. For the thicker coatings, the critical temperature of the specimens decreased monotonically with the thickness of the copper. The critical temperatures of the specimens as a function of reduced effective thickness of copper are approximated quite well by the formula
Type
Thesis
Description
Series/Report No
Department
Physics
Other Units
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Rights
Collections