Josephson effects in granular NbN microbridges

Conference · Sat Dec 15 04:00:00 EST 1979 · AIP Conf. Proc.; (United States)

OSTI ID:5600858

Cukauskas, E J; Claassen, J H; Nisenoff, M; Galfo, C H; Steiner, R L; Deaver, Jr, B S

High resistance granular NbN microbridges with submicron dimensions have been fabricated and investigated. Devices with critical currents less than 5 microamps and bridge resistances of the order of 50 ohms have been studied as a function of temperature at both zero and finite voltages. The current-voltage characteristics were measured with various levels of applied radiation in the frequency range 11--40 GHz. For these frequencies, constant voltage-current steps were observed at the Josephson frequency, 2eV/h for low applied voltages, at higher voltages the radiation induced step spacing deviated from that of ideal Josephson behavior. Additional current steps were also observed at temperatures just above the bridge T/sub c/ where no finite critical current could be dected. These effects and other characteristics observed on the I-V curves will be reported and discussed.

• Research Organization: Naval Research Laboratory, Washington, D.C. 20375
• OSTI ID: 5600858
• Report Number(s): CONF-791151-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 58:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
GRAIN REFINEMENT
JOSEPHSON EFFECT
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
QUARTZ
SILICON COMPOUNDS
SILICON OXIDES
SPUTTERING
SUBSTRATES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE