Interface resistance and reduction of I sub c R product in YBa sub 2 Cu sub 3 O sub 7 -Ag-Pb proximity junctions

Journal Article · Mon Jul 29 04:00:00 EDT 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.105396· OSTI ID:5742885

Lee, M; Beasley, M R ^[1]

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1. Department of Applied Physics, Stanford University, Stanford, California 94305 (US)

Studies of the proximity coupling of YBa{sub 2}Cu{sub 3}O{sub 7} through Ag to a Bardeen--Cooper--Schrieffer (BCS) superconductor have shown that the {ital I}{sub {ital c}R} product is systematically much smaller than the BCS limit of {similar to}5 mV. These {ital I}{sub {ital c}R} values range from 10 to 100 {mu}V in the YBa{sub 2}Cu{sub 3}O{sub 7} {ital a} direction to apparently zero in the {ital c} direction. The reduced {ital I}{sub {ital c}R} in the {ital a} direction can be understood as arising from a large boundary resistance, consistent with the mismatch of carrier densities across the YBa{sub 2}Cu{sub 3}O{sub 7}-Ag interface. The same analysis gives an {ital I}{sub {ital c}R} in the {ital c}-oriented junctions that is at least three orders of magnitude larger than observed.

• OSTI ID: 5742885
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 59:5; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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Cermets
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
HIGH-TC SUPERCONDUCTORS
JUNCTIONS
LEAD
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PROXIMITY EFFECT
QUATERNARY COMPOUNDS
SILVER
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES