Ultraviolet photoemission study of single-crystal BaPb/sub 1/minus//ital x//Bi/sub /ital x//O/sub 3/
An ultraviolet photoemission study on single-crystal BaPb/sub 1/minus//ital x//Bi/sub /ital x//O/sub 3/ with/ital x/=0.15 (superconductor) and /ital x/=1.0 (semiconductor) has been presented. A clear Fermi-edge structure was observed for the first time for the superconducting compound. A rigid shift of the valence band by 0.3--0.4 eV between the superconductor and the semiconductor was observed although the shift is much smaller than predicted from the band-structure calculation. The ''mysterious 9-eV peak,'' whose origin has been controversial in cuprate superconductors, was found also for degraded crystal surfaces of BaPb/sub 1/minus//ital x//Bi/sub /ital x//O/sub 3/. Its origin was discussed in connection with the difference and similarity in the high-/ital T//sub /ital c// mechanism between cuprate and noncuprate superconductors.
- Research Organization:
- Department of Physics, Tohoku University, Sendai 980, Japan (JP); Engineering Research Institute, University of Tokyo, Tokyo 113, Japan
- OSTI ID:
- 6050936
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 40:4
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
ELECTRONIC STRUCTURE
SUPERCONDUCTIVITY
BISMUTH OXIDES
LEAD OXIDES
COOPER PAIRS
MONOCRYSTALS
PHOTOEMISSION
ULTRAVIOLET SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EMISSION
LEAD COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SECONDARY EMISSION
SPECTRA
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity