Tunneling and infrared measurements of the energy gap in the high-critical-temperature superconductor Y-Ba-Cu-O
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
We have measured the superconducting energy gap ..delta.. of high-critical-temperature (T/sub c/--90 K)= YBa/sub 2/Cu/sub 3/O/sub 9-//sub y/ samples using tunneling and infrared techniques. From our tunneling data, we place limits on the reduced superconducting energy gap of 3.7<2..delta../k/sub B/T/sub c/<5.6. The tunneling gaps for a single-crystal sample are essentially the same if the tunneling tip is oriented either parallel or perpendicular to the CuO planes. The infrared measurements give a smaller apparent gap. We discuss the origins of the differences between the infrared and tunneling results.
- Research Organization:
- IBM Thomas J. Watson Laboratory, Yorktown Heights, New York 10598
- OSTI ID:
- 6370152
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:16; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Tunneling spectroscopy of YBa/sub 2/Cu/sub 3/O/sub 6. 5+//sub x/ and Y/sub 0. 95/Al/sub 0. 05/Ba/sub 2/Cu/sub 3/O/sub 6. 5+//sub x/ with use of a scanning-tunneling microscope
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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
INFRARED SPECTRA
LOW TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPECTRA
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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
INFRARED SPECTRA
LOW TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPECTRA
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT
YTTRIUM COMPOUNDS
YTTRIUM OXIDES