Josephson tunneling and gap structure in Y sub 1 Ba sub 2 Cu sub 3 O sub 7 minus y /oxide barrier/Pb planar junctions on tetragonal LaSrGaO sub 4 (100) substrates

Journal Article · Wed May 15 00:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347597· OSTI ID:5689261

Wen, Z; Iguchi, I ^[1]; Nakamura, K ^[2]

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1. Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305, Japan (JP)
2. Materials Laboratory, Komatsu Ltd., 1200 Manda, Hiratsuka, Kanagawa 254, (Japan)

The Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}}/oxide barrier/Pb thin film tunnel junctions are fabricated on the (100) plane of new tetragonal LaSrGaO{sub 4} single-crystal substrates by an {ital in} {ital situ} electron-beam deposition technique. Reproducible Josephson behavior is observed for all fabricated junctions. Above a Josephson critical current, a premature switching voltage of about 1 mV appears. The {ital I}-{ital V} curve under an applied magnetic field exhibits low-leakage quasiparticle tunneling characteristic. Modulation of Josephson critical current by the applied magnetic field yields a reversible Fraunhofer-like pattern against flux direction.

• OSTI ID: 5689261
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:10; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
426001 -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
DEPOSITION
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY BEAM DEPOSITION
FABRICATION
HIGH-TC SUPERCONDUCTORS
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
JUNCTIONS
LEAD
MAGNETIC FLUX
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RELIABILITY
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SURFACE COATING
TRANSITION ELEMENT COMPOUNDS
TUNNEL EFFECT
YTTRIUM COMPOUNDS
YTTRIUM OXIDES