Observations of quasi-particle tunneling and Josephson behavior in Y sub 1 Ba sub 2 Cu sub 3 O sub 7 minus x / native barrier/Pb thin-film junctions
- AT T Bell Laboratories, Murray Hill, New Jersey 07974 (US)
Low-leakage, thin-film planar tunnel junctions made of Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}/ native barrier/Pb were fabricated. The Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} films were prepared by {ital in} {ital situ} molecular beam epitaxy aided with an activated oxygen source. The as-grown, smooth superconducting perovskite film surface exhibits quasi-particle tunneling characteristics very similar to the etched bulk single-crystal data. The results in agreement are a linear dependence of the normal-state conductance on voltage, a gap-like structure at {similar to}20 mV, asymmetric modulations up to 50 mV, and a finite zero-bias conductance at low temperature. Junctions of lower resistance show, at temperatures below {ital T}{sub {ital c}} of Pb, the development of a supercurrent at zero bias and associated hysteretic subgap structure, with a typical {ital I}{sub {ital c}}{ital R} {similar to}0.5 mV. Josephson-like behavior occurred in response to applied magnetic field and microwaves.
- OSTI ID:
- 7171447
- Journal Information:
- Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 56:8; ISSN APPLA; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
FILMS
INFORMATION
JOSEPHSON EFFECT
JUNCTIONS
LEAD
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT
YTTRIUM COMPOUNDS
YTTRIUM OXIDES