Coherent behavior of two interacting Dayem bridges

Journal Article · Thu Dec 01 04:00:00 EST 1977 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00661535· OSTI ID:5342440

Lindelof, P E; Hansen, J B

Two superconducting thin-film microbridges (Dayem bridges) fabricated in the same tin or indium film and situated only a few micrometers apart can have their Josephson frequencies locked to each other when their dc voltages are approximately matched (independent of their relative sign). We have in a number of cases studied the results of such an interaction in the current--voltage characteristics and in the total emitted Josephson radiation. The threshold for observing a mutual locking depends on the quality of the Dayem bridges as well as on the distance between the two bridges. For tin we have so far obtained coherent behavior for two Dayem bridges at a distance of up to 12 ..mu..m. For indium the corresponding distance was 3.5 ..mu..m. A tentative model of the interaction is proposed. This model includes the suggestion of a propagating current/branch imbalance excitation in superconductors.

• Research Organization: Physics Laboratory I, H. C. Orsted Institute, University of Copenhagen, Copenhagen, Denmark
• OSTI ID: 5342440
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 29:5; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRITICAL CURRENT
CURRENTS
DISPERSION RELATIONS
ELECTRIC BRIDGES
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FILMS
INDIUM
JOSEPHSON JUNCTIONS
MATHEMATICAL MODELS
METALS
PHYSICAL PROPERTIES
QUASI PARTICLES
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
TIN