Asymmetric current-voltage characteristics in type-II superconductors

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.9244· OSTI ID:6951077

Jiang, X; Connolly, P J; Hagen, S J; Lobb, C J ^[1]

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1. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)

We report asymmetric current-voltage characteristics in superconducting films in a parallel magnetic field. The critical current, [ital I][sub [ital c]], is found to differ by as much as 30% for negative and positive currents, and beyond [ital I][sub [ital c]], the magnitude of the voltage is also different for positive and negative currents, [vert bar][ital V](+[ital I])[vert bar][ne][vert bar][ital V]([minus][ital I])[vert bar]. The critical current difference [vert bar][ital I][sub [ital c]+][vert bar][minus][vert bar][ital I][sub [ital c][minus]][vert bar] has complicated behavior, changing sign as temperature and magnetic field are varied. We propose a model based on the Bean-Livingston surface barrier and inhomogeneous bulk pinning that accounts for all observed behavior.

• OSTI ID: 6951077
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:13; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

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Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALLOYS
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CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
CRITICAL CURRENT
CUPRATES
CURRENTS
ELECTRIC CURRENTS
EPITAXY
FILMS
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MAGNETIC FLUX
MAGNETIC PROPERTIES
MIXED STATE
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OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TRANSITION ELEMENT COMPOUNDS