Effect of inhomogeneities and measuring current on the current-voltage characteristics of superconducting nonsymmetric tunnel junctions
Journal Article
·
· Sov. J. Low Temp. Phys. (Engl. Transl.); (United States)
OSTI ID:5685020
It is shown experimentally that the shape of the current-voltage characteristics of superconducting nonsymmetric thin-film junctions depends on both the inhomogeneity of the films and the tunnel resistivity which determines the measurement current. Reproducible results consistent with the BCS theory were obtained only for low-resistance junctions in which the shape of the I-V curve is close to the theoretical shape. In the case of slight deviations from the theoretical I-V curve the smearing of the current jump at V approx. = (..delta../sub 1/+..delta../sub 2/)/e can be attributed to the superconductor with the higher T/sub c/. Comparison of experiment with theory for highly inhomogeneous Al and Zn thin films revealed that the criteria for reckoning both the energy gap and T/sub c/ are important. Measurements on low-resistance aluminum--insulator--thallium and zinc--insulator--aluminum junctions yielded the following values for 2..delta.. (0)/kT/sub c/: 3.55 +- 0.04 and 3.53 +- 0.04 for Al films, 3.54 +- 0.04 for thallium films, and 3.53 +- 0.06 for zinc films.
- Research Organization:
- Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR
- OSTI ID:
- 5685020
- Journal Information:
- Sov. J. Low Temp. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States) Vol. 5:6; ISSN SJLPD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM
BCS THEORY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY GAP
FILMS
JOSEPHSON JUNCTIONS
METALS
PHYSICAL PROPERTIES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
THALLIUM
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ZINC
360104 -- Metals & Alloys-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM
BCS THEORY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY GAP
FILMS
JOSEPHSON JUNCTIONS
METALS
PHYSICAL PROPERTIES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
THALLIUM
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ZINC