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Nature of the states near the Fermi level of the layered superconductors of Bi/sub 2/Ca/sub 1/Sr/sub 2/Cu/sub 2/O/sub 8/ and Bi/sub 2/Sr/sub 2/CuO/sub 6/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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Photoemission spectroscopy using synchrotron radiation has been used to investigate the electronic structure of the Bi/sub 2/Ca/sub 1/Sr/sub 2/Cu/sub 2/O/sub 8/ and the Bi/sub 2/Sr/sub 2/CuO/sub 6/ superconductors. The states near the Fermi level E/sub F/, as observed in photoemission spectroscopy in these two compounds, have less Cu character than the La/sub 1.8/Sr/sub 0.2/CuO/sub 4/ and the YBa/sub 2/Cu/sub 3/O/sub 7/ superconductors. We suggest the coexistence of bandlike p states of Bi-O origin and correlated Cu 3d O 2p bands. The p bands of Bi-O are occupied differently in the Bi/sub 2/Ca/sub 1/Sr/sub 2/Cu/sub 2/O/sub 8/ and the Bi/sub 2/Sr/sub 2/CuO/sub 6/ superconductors, resulting in a different density of states near E/sub F/ and a slightly different valency of the Bi ions in the two compounds. We point out the correlation between the difference in the density of states near E/sub F/ and the difference in the superconducting transition temperatures of the Bi/sub 2/Ca/sub 1/Sr/sub 2/Cu/sub 2/O/sub 8/ and the Bi/sub 2/Sr/sub 2/CuO/sub 6/ superconductors.
Research Organization:
Stanford Electronics Laboratories, Stanford University, Stanford, California 94305
OSTI ID:
6481184
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:1; 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
BISMUTH COMPOUNDS
BISMUTH OXIDES
BREMSSTRAHLUNG
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
LAYERS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHYSICAL PROPERTIES
RADIATIONS
SPECTROSCOPY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
SYNCHROTRON RADIATION
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRAHIGH VACUUM