Critical current of a Josephson junction with spatial fluctuations of the order parameter

Journal Article · Mon Nov 30 23:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.13951· OSTI ID:7156580

Dorin, V V ^[1]; Fistul', M V ^[2]

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1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
2. Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States)

The magnetic field dependence of the critical current of a Josephson junction near the critical temperature is studied. It is proven that as the temperature approaches [ital T][sub [ital c]], the [ital I][sub [ital c]]([ital H]) dependence of a comparatively small Josephson junction shows random current oscillations with amplitudes of the order of those of the current itself. This mesoscopic behavior is investigated above and below the critical temperature. At temperatures above [ital T][sub [ital c]], the supercurrent flowing in small junctions is predicted. Below [ital T][sub [ital c]] the deviations from the periodic Fraunhofer'' dependence of the critical current are obtained. The correlation functions of currents are calculated for various values of the magnetic field.

• DOE Contract Number: FG02-90ER45427
• OSTI ID: 7156580
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:21; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CORRELATION FUNCTIONS
CRITICAL CURRENT
CRITICAL TEMPERATURE
CURRENTS
ELECTRIC CURRENTS
FLUCTUATIONS
FUNCTIONS
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FIELDS
ORDER PARAMETERS
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VARIATIONS