Magnetic field dependence of the critical current anisotropy in normal metal-YBa sub 2 Cu sub 3 O sub 7 minus. delta. thin-film bilayers

Journal Article · Mon Mar 18 00:00:00 EST 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104365· OSTI ID:6226586

Ono, R H; Goodrich, L F; Beall, J A; Johansson, M E; Reintsema, C D ^[1]

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1. Electromagnetic Technology Division National Institute of Standards and Technology, Boulder, Colorado 80303 (US)

We have measured the transport critical current density ({ital J}{sub {ital c}}) in epitaxial quality films of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} some of which were covered by thin (10 nm) Ag films. The films, both with and without Ag, had {ital J}{sub {ital c}} values greater than 10{sup 6} A/cm{sup 2} in liquid nitrogen. The effect of the Ag was to greatly reduce the dependence of {ital J}{sub {ital c}} on external magnetic fields in the case where the field was oriented in the plane of the film, that is, perpendicular to the {ital c} axis. It is unlikely that the effect is simply due to altered surface pinning, although qualitative agreement with critical state models is observed.

• OSTI ID: 6226586
• Journal Information: Applied Physics Letters; (USA), Vol. 58:11; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CRITICAL CURRENT
COPPER OXIDES
YTTRIUM OXIDES
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
MAGNETIC FLUX
SILVER
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
FILMS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties