Influence of thermal oxide on leakage current for Pb-alloy Josephson junctions

Journal Article · Sat Mar 15 04:00:00 EST 1986 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.336397· OSTI ID:5953595

Yuda, M; Wada, M; Nakano, J

The effects of thermal oxide on leakage current of rf-plasma oxidized Pb-In-Au alloy Josephson junctions are examined. The leakage current is small in junctions with thermal oxide grown at low oxygen pressure and for a long period. Current-voltage characteristics at low temperature show that the leakage current magnitude is closely related to the magnitude of the current steps at the gap voltages of electrode materials. Furthermore, optical property investigations of the oxide show that leakage current decreases with a decrease in the oxide absorption coefficients, which are correlated to carrier density. Based on these experimental data, a leakage current model is proposed for Pb-alloy junctions. This model shows that the tunneling current between superconductor and normal metal regions in the oxide barrier causes leakage current.

• Research Organization: NTT Atsugi Electrical Communication Laboratories, 3-1, Morinosato Wakamiya, Atsugi-shi, Kanagawa, 243-01, Japan
• OSTI ID: 5953595
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 59:6; ISSN JAPIA
• Country of Publication: United States
• Language: English

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
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FABRICATION
GOLD ALLOYS
INDIUM ALLOYS
JOSEPHSON JUNCTIONS
JUNCTIONS
LEAD ALLOYS
LEAD COMPOUNDS
LEAD OXIDES
LEAKAGE CURRENT
OPTICAL PROPERTIES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS
TUNNEL EFFECT