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Unoccupied electronic states and surface phenomena for YBa/sub 2/Cu/sub 3/O/sub 6. 9/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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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 --3.7 eV above E/sub F/. Large emission features appearing at 6.6 and 8.6 eV are associated with Ba 5d- and Y 4d-derived bands, respectively, while structure at 13.4 eV above E/sub F/ is due to localized Ba 4f states. Energy-dependent studies reveal a dispersive band between --4 and --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:
Department of Chemical Engineering and Materials Science, University of Minneosta, Minneapolis, Minnesota 55455
OSTI ID:
6292448
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:7; ISSN PRBMD
Country of Publication:
United States
Language:
English

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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
BAND THEORY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COLLISIONS
COPPER COMPOUNDS
COPPER OXIDES
ELECTRON COLLISIONS
ELECTRONIC STRUCTURE
EMISSION
ENERGY RANGE
ENERGY-LEVEL DENSITY
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
KEV RANGE
KEV RANGE 01-10
OXIDES
OXYGEN COMPOUNDS
PHOTON EMISSION
SEPARATION PROCESSES
SORPTION
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES