Accession Number : AD0469139

Title :   MICROWAVE ABSORPTION IN NORMAL CONDUCTING FILMS ON SUPERCONDUCTING SUBSTRATES,

Corporate Author : STEVENS INST OF TECH HOBOKEN NJ DEPT OF PHYSICS AND ENGINEERING PHYSICS

Personal Author(s) : Fanelli, Robert ; Meissner, Hans

Report Date : 1965

Pagination or Media Count : 23

Abstract : The microwave absorption at 9.2 kmc in films of gold and copper plated onto bulk tin has been measured as a function of the temperature in the range 1.4 to 4.2 K. In the limit of zero temperature the results indicate the presence of an energy gap of 0.61 x 10 to the -23rd power J at the surface of a 190 angstrom film of gold and at the surface of a 500 angstrom film of copper on tin. The normal bulk resistivity of the gold was estimated from D.C. measurements as well as from the microwave data. The theory of the proximity effect, that is the influence of adjoining normal and superconducting metals, as given by DeGennes and Werthamer was applied to the measurements and yielded an estimate for N(O)V for gold of 0.009. Assuming that the sign of N(O)V is positive this leads to a very low transition temperature. (Author)

Descriptors :   (*MICROWAVES, ABSORPTION), (*METAL FILMS, ABSORPTION), SUPERCONDUCTORS, GOLD, COPPER, SUPERHIGH FREQUENCY, TIN, PLATING, CRYOGENICS, SURFACES, ELECTRICAL RESISTANCE.

Distribution Statement : APPROVED FOR PUBLIC RELEASE