Josephson behavior in granular NbN weak links

Journal Article · Thu May 01 00:00:00 EDT 1980 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.91652· OSTI ID:5396242

Claassen, J H

A substrate step technique has been used to fabricate superconducting NbN weak links of length approx.750 A, width approx.1.5 ..mu..m. The film in the weak-link region is less than 100 A thick, and shows evidence of being granular. These devices have very high resistance (as much as 30 ..cap omega..), are quite rugged, and show almost ideal Josephson response to microwave radiation at 70 GHz. A vortex flow model is expected to apply because of the small coherence length in the weak-link material. However, the well-known resistively shunted junction model is found to be a significantly better predictor of device behavior.

• Research Organization: Naval Research Laboratory, Washington, D.C. 20375
• OSTI ID: 5396242
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 36:9; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COHERENCE LENGTH
DATA
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
FABRICATION
FILMS
FREQUENCY RANGE
GHZ RANGE
INFORMATION
JOSEPHSON EFFECT
MATHEMATICAL MODELS
MICROWAVE RADIATION
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
RADIATIONS
SUBSTRATES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THICKNESS
TRANSITION ELEMENT COMPOUNDS