Apparent critical currents and rf steps in a second-order proximity-induced Josephson effect

Journal Article · Wed Oct 31 23:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.8682· OSTI ID:6091582

Han, S ^[1]; Cohen, L F; Wolf, E L ^[2]

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1. Department of Physics, State University of New York at Stony Brook, Stony Brook, NY (USA)
2. Department of Physics, Polytechnic University, Brooklyn, NY (USA)

Numerical {ital I}({ital V}) results for superconductor--insulator--normal-metal ({ital S}-{ital I}-{ital N}) tunnel junctions suggest that a unified treatment of the weak excess currents (pair-field susceptibility) and proximity-induced Josephson-effect (PJE) phenomena (apparent critical currents, rf steps, and Fraunhofer-like {ital I}{sub {ital c}}({ital B})) is provided by the Geshkenbein-Sokol time-dependent Ginzburg-Landau theory of second-order Josephson effects in {ital S}-{ital I}-{ital N} tunnel junctions. The numerical results and other considerations speak against a recent suggestion that a phase-slip center in the superconducting tip may play a role in PJE point-contact experiments. These considerations confirm the utility of proximity Josephson-effect experiments to probe unconventional superconductivity in materials such as UBE{sub 13}, as first pointed out by Han {ital et} {ital al}.

• DOE Contract Number: FG02-87ER45301
• OSTI ID: 6091582
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:13; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
GINZBURG-LANDAU THEORY
JOSEPHSON JUNCTIONS
JUNCTIONS
PHYSICAL PROPERTIES
PROXIMITY EFFECT
SUPERCONDUCTING JUNCTIONS
TIME DEPENDENCE