Diagnostics with series-connected Josephson tunnel junctions

Journal Article · Sun Jan 01 04:00:00 EST 1978 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.324392· OSTI ID:5228872

Hebard, A F; Eick, R H

The prospect of incorporating Josephson tunnel junctions into future device technologies requires that fabrication procedures be developed which assure high junction yield, uniform quality, and reproducibility. Critical-current distributions which are extracted from the I-V characteristics of series-connected lead and lead-alloy junction arrays provide a quantitative measure of the yield, as revealed by a direct count of the 2..delta.. increments, and the quality or uniformity, as revealed by the width of the distribution. Examples of the effects of oxidation parameters, junction area, electrode thickness, magnetic fields, and thermal cycling on the critical-current distributions demonstrate the ease in which significant statistical information on simultaneously prepared junctions is obtained. As a further illustration of the use of this diagnostic method, we present results on flux-trapping experiments together with a preliminary survey of the effectiveness of a simple technique in which lead alloys are evaporated from a single source to completion and then oxidized in an acidic-oxygen environment.

• Research Organization: Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 5228872
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 49:1; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
CHEMICAL REACTIONS
CRITICAL CURRENT
CURRENTS
ELECTRIC CURRENTS
ELECTRODES
ELEMENTS
FABRICATION
FILMS
GOLD ALLOYS
INDIUM ALLOYS
JOSEPHSON JUNCTIONS
LEAD
LEAD ALLOYS
MAGNETIC FIELDS
MAGNETIC FLUX
METALS
OXIDATION
PERFORMANCE TESTING
QUALITY ASSURANCE
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
TESTING
THERMAL CYCLING
TUNNEL EFFECT