Reproducible tunneling data on chemically etched single crystals of YBa sub 2 Cu sub 3 O sub 7
- AT T Bell Laboratories, Murray Hill, New Jersey 07974 (US)
We have fabricated tunnel junctions between chemically etched single crystals of YBa{sub 2}Cu{sub 3}O{sub 7} and evaporated metal counterelectrodes which exhibit reproducible characteristics. Above the bulk critical temperature of YBa{sub 2}Cu{sub 3}O{sub 7}, {ital T}{sub {ital c}}, the conductance, {ital G}({ital V}), has a linear dependence with voltage and has some asymmetry. Below {ital T}{sub {ital c}}, additional structure associated with the superconductivity appears in {ital G}({ital V}). At {ital T}{much lt}{ital T}{sub {ital c}} there is a reproducible, finite, zero-bias conductance which suggests that there are states at the Fermi energy superconducting YBa{sub 2}Cu{sub 3}O{sub 7}. Junctions with Pb, Sn, Bi, Sb, PbBI, and Au counterelectrodes all show qualitatively similar behavior.
- OSTI ID:
- 5524950
- Journal Information:
- Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 63:9; ISSN PRLTA; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201 -- Ceramics
Cermets
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360204* -- Ceramics
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ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ANTIMONY
ASYMMETRY
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH
BISMUTH ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODES
ELEMENTS
ENERGY LEVELS
ETCHING
FABRICATION
FERMI LEVEL
LEAD
LEAD ALLOYS
METALS
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SURFACE FINISHING
THERMODYNAMIC PROPERTIES
TIN
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT
YTTRIUM COMPOUNDS
YTTRIUM OXIDES