Effect of bias electrodes on characteristics of long Josephson junctions

Conference · Fri Mar 01 04:00:00 EST 1985 · IEEE Trans. Magn.; (United States)

OSTI ID:6389396

Radparvar, M; Nordman, J E

The authors have investigated the characteristics of long Josephson junctions with geometries containing several entry points for current. A single device can be biased at a junction end, at the center, or at both ends depending on the choice of electrodes. A branch of the current-voltage curves and the dependence of maximum DC Josephson current on an external magnetic field may be symmetric or asymmetric for a single device depending on the current feed points. In all of the cases, at a given current bias on this branch, the junction voltage increases with the application of an external magnetic field beyond a critical field. This is the minimum magnetic field necessary to introduce fluxons into the junction. A simple model for tunnel current distribution is used to explain the experimental data. For an asymmetrically biased junction, they show that the effective dynamic resistance exhibited for bias at a boundary is either 0 or ..sqrt..l/c. This suggests that the dynamic resistance of the device may be varied by merely moving the bias feed point along the junction.

• Research Organization: Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI
• OSTI ID: 6389396
• Report Number(s): CONF-840937-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: MAG-21:2
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRITICAL FIELD
CURRENTS
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRODES
ELECTRODYNAMICS
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS