Superconducting energy gap and normal-state reflectivity of single crystal Y-Ba-Cu-O
We report the first measurements of the normal-state reflectivity and superconducting energy gap of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/ single crystals. With the electric field in the metallic, a-b plane of our platelike crystals we observe a Drude normal-state reflectivity, and an enhancement of the reflectivity at temperatures below T/sub c/(90 K) which follows the Mattis-Bardeen form. The superconducting energy gap obtained from these measurements is found to be temperature dependent, increasing to a value of 2..delta../kT/sub c/approx. =8 below approx. =50 K. Within the Eliashberg-BCS framework this unusually large gap value suggests that Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/ is a very strongly coupled superconductor.
- Research Organization:
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
- OSTI ID:
- 6093796
- Journal Information:
- Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 59:17; ISSN PRLTA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Radiative properties of superconducting Y-Ba-Cu-O thin films
Comparison of the electrodynamic properties of sintered YBa/sub 2/Cu/sub 3/O/sub 7-//sub y/ and La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4-//sub y/
Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
COPPER COMPOUNDS
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
MONOCRYSTALS
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFLECTIVITY
SUPERCONDUCTIVITY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS