Nature of the valence band states in Bi sub 2 (Ca, Sr, La) sub 3 Cu sub 2 O sub 8
- Stanford Electronics Laboratories, Stanford University, Stanford, CA (USA)
- Department of Applied Physics, Stanford University, Stanford, CA (USA)
We have used photoemission spectroscopy to examine the symmetry of the occupied states of the valence band for the La doped superconductor Bi{sub 2}(Ca, Sr, La){sub 3}Cu{sub 2}O{sub 8}. While the oxygen states near the bottom of the 7 eV wide valence band exhibit predominantly O 2p{sub z} symmetry, the states at the top of the valence band extending to the Fermi level are found to have primarily O 2p{sub x} and O 2p{sub y} character. We have also examined anomalous intensity enhancements in the valence band feature for photon energies near 18 eV. These enhancements, which occur at photon energies ranging from 15.8 to 18.0 eV for the different valence band features, are not consistent with either simple final state effects or direct O2s transitions to unoccupied O2p states.
- DOE Contract Number:
- AC03-82ER13000
- OSTI ID:
- 6553107
- Report Number(s):
- CONF-891092--
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (USA), Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Vol. 199:1; ISSN APCPC; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360200* -- Ceramics
Cermets
& Refractories
ALKALINE EARTH METAL COMPOUNDS
BAND THEORY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ENERGY LEVELS
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
OXIDES
OXYGEN COMPOUNDS
P STATES
PHOTOELECTRON SPECTROSCOPY
RARE EARTH COMPOUNDS
SPECTROSCOPY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS