Josephson tunneling and the proximity effect

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.28.1294· OSTI ID:5517377

Kresin, V Z

Josephson junctions containing one or two proximity systems (e.g., S/sub ..cap alpha../-M/sub ..beta../-I-S/sub ..gamma../, S/sub ..cap alpha../-M/sub ..beta../-I-M/sub ..gamma../-S/sub delta/; M(..gamma..) is a normal metal or superconductor) are studied. An analysis of the thickness and temperature dependences of the maximum dc Josephson current I/sub M/ is carried out. The curvature of the function I/sub M/(L/sub ..beta../) is found to depend strongly on the ratio of energy gaps epsilon/sub ..gamma..//epsilon/sub ..cap alpha../ and on the temperature. The analysis is based on the thermodynamic Green's-function method, and the effect of strong coupling is also taken into account. If the proximity system contains two superconductors S/sub ..cap alpha../ and S/sub ..beta../, then it appears that the electron-phonon interaction described by the constant lambda/sub ..beta../ contributes noticeably even if T>T/sub c/..beta...

• Research Organization: Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• OSTI ID: 5517377
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 28:3; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656101* -- Solid State Physics-- Superconductivity-- General Theory-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON-PHONON COUPLING
ENERGY GAP
FUNCTIONS
GINZBURG-LANDAU THEORY
GREEN FUNCTION
JOSEPHSON JUNCTIONS
JUNCTIONS
MATHEMATICAL MODELS
PARTICLE MODELS
PROXIMITY EFFECT
STRONG-COUPLING MODEL
SUPERCONDUCTING JUNCTIONS
TEMPERATURE DEPENDENCE
THERMODYNAMICS