Bi-epitaxial grain boundary junctions in YBa sub 2 Cu sub 3 O sub 7

Journal Article · Mon Aug 05 04:00:00 EDT 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.105355· OSTI ID:5743507

Char, K; Colclough, M S; Garrison, S M; Newman, N; Zaharchuk, G ^[1]

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1. Conductus, Inc., Sunnyvale, California 94086 (US)

We have developed a new way of making grain boundary junctions in YBa{sub 2}Cu{sub 3}O{sub 7} thin films by controlling the in-plane epitaxy of the deposited film using seed and buffer layers. We produce 45{degree} grain boundaries along photolithographically defined lines. The typical value of the critical current density of the junctions is 10{sup 3}--10{sup 4} A/cm{sup 2} at 4.2 K and 10{sup 2}--10{sup 3} A/cm{sup 2} at 77 K, while the rest of the film has a critical current density of 1--3{times}10{sup 6} A/cm{sup 2} at 77 K. The current-voltage characteristics of the junctions show resistively shunted junction behavior and we have used them to fabricate dc superconducting quantum interference devices (SQUIDs) which show modulation at temperatures well above 77 K. This is the first planar high {ital T}{sub {ital c}} Josephson junction technology that appears readily extendable to high {ital T}{sub {ital c}} integrated circuits.

• OSTI ID: 5743507
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 59:6; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CURRENTS
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
FLUXMETERS
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
JOSEPHSON JUNCTIONS
JUNCTIONS
MEASURING INSTRUMENTS
MICROSTRUCTURE
MICROWAVE EQUIPMENT
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
QUATERNARY COMPOUNDS
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES