Unoccupied electronic states and surface phenomena for YBa/sub 2/Cu/sub 3/O/sub 6. 9/
Technical Report
·
OSTI ID:6231000
Inverse photoemission was used to probe the unoccupied electronic levels within 25 eV of E/sub F/ for the high temperature superconductor YBa/sub 2/Cu/sub 3/O/sub 6.9/. Our results show that the density of states is low from E/sub F/ to /approximately/3.7 eV. Large emission features appearing at 6.5 eV and 8.6 eV are associated with Ba 5d- and Y 4d-derived bands, respectively, while structure at 14 eV above E/sub F/ is due to localized Ba 4f states. Energy dependent studies reveal a dispersive band between /approximately/4 and /approximately/6 eV above E/sub F/. An oxygen- induced feature was observed at 1.8 eV, but there is no evidence that high-energy electron-stimulated-desorption removes these chemisorption states.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6231000
- Report Number(s):
- ANL/PPRNT-89-167; ON: DE89008356
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL SHIFT
CHEMISORPTION
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
EMISSION
ENERGY LEVELS
FERMI LEVEL
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
PHYSICAL PROPERTIES
SECONDARY EMISSION
SEPARATION PROCESSES
SORPTION
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360104* -- Metals & Alloys-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL SHIFT
CHEMISORPTION
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
EMISSION
ENERGY LEVELS
FERMI LEVEL
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
PHYSICAL PROPERTIES
SECONDARY EMISSION
SEPARATION PROCESSES
SORPTION
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES