Microwave response of thin-film superconductors

Journal Article · Fri Jan 01 04:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.340483· OSTI ID:5743006

Sridhar, S

The interaction of microwaves with superconductors was explored via extensive measurements of the surface resistance R/sub s/ and reactance X/sub s/ at 10 GHz of superconducting Sn. The measurements were carried out as functions of thickness d and temperature T for Sn films ranging in thickness from 190 A to bulk. By varying the thickness with accompanied variation of mean free path, we were able to examine the wave-vector dependence of the microwave-superconductor interaction. An analysis, based on the Bardeen--Cooper--Schrieffer electrodynamical kernel, was developed for calculating R/sub s/ and X/sub s/ as functions of d, T, and frequency. Details of the measurement techniques and analysis are presented. Experiment and theory agree excellently, with no adjustable parameters. For films with d<800 A we find that the electrodynamics is local because of impurity scattering, while for thicker films nonlocal effects are important. The results imply that superconducting films with microwave response that agrees with theoretical expectations can be fabricated for potential applications in a variety of superconducting structures.

• Research Organization: Department of Physics, California Institute of Technology, Pasadena, California 91125
• OSTI ID: 5743006
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 63:1; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTIVITY
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
FILMS
IMPURITIES
INFORMATION
METALS
MICROWAVE RADIATION
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SCATTERING
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THIN FILMS
TIN