Electron tunneling into the high-T/sub c/ superconductor Y-Ba-Cu-O

Journal Article · Wed Jun 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.9837· OSTI ID:7257261

Gijs, M A.M.; de Vries, J W.C.; Stollman, G M

We have made tunneling measurements on junctions made on a polished surface of an Y-Ba-Cu-O pellet with an evaporated Pb layer as counterelectrode. We observe a Zeller-Giaever-like tunneling characteristic with a superconducting energy gap ..delta.. = 6 meV. This value is much smaller than the gap seen in point-contact tunneling experiments but is consistent with the gap found from infrared reflectivity measurements. We argue that this difference is due to the different superconducting properties of the surface layer and of the bulk of the material.

• Research Organization: Philips Research Laboratories, 5600JA Eindhoven, The Netherlands
• OSTI ID: 7257261
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:16; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
ENERGY-LEVEL DENSITY
OXIDES
OXYGEN COMPOUNDS
PELLETS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
TUNNEL EFFECT
YTTRIUM COMPOUNDS
YTTRIUM OXIDES