Electronic structure of ceramics and thin-film samples of high T/sub c/ Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta/ superconductors: Effects of Ar/sup +/ sputtering, O/sub 2/ exposure, and Rb deposition

Journal Article · Mon Nov 14 00:00:00 EST 1988 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.100672· OSTI ID:6749275

Lindberg, P A.P.; Soukiassian, P; Shen, Z; Shah, S I; Eom, C B; Lindau, I; Spicer, W E; Geballe, T H

The electronic structure of bulk, and, for the first time, thin-film samples of the new class of high T/sub c/ Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta/ superconductors, is investigated by photoemission spectroscopy using synchrotron radiation. Ar/sup +/ sputtering and Rb deposition result in disrupted Bi O bonds and subsequent change in the valency of Bi, while oxygen adsorption or annealing in oxygen is found to restore the Bi O bonds. The results also show that adsorbates of O/sub 2/ and/or Rb readily give rise to a number of new oxygen states in the valence band of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta/. The Ar/sup +/-sputtered film is found to be more sensitive to adsorbates of O/sub 2/ and Rb than the scraped bulk sample, as monitored by the Bi 5d core shifts and the oxygen-induced valence-band states.

• Research Organization: Stanford Electronics Laboratories, Stanford University, Stanford, California 94305
• OSTI ID: 6749275
• Journal Information: Appl. Phys. Lett.; (United States), Vol. 53:20
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
ELECTRONIC STRUCTURE
PHOTOEMISSION
CALCIUM OXIDES
COPPER OXIDES
STRONTIUM OXIDES
ADSORPTION
ARGON IONS
CHEMICAL COMPOSITION
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
THIN FILMS
VALENCE
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
EMISSION
FILMS
IONS
OXIDES
OXYGEN COMPOUNDS
SECONDARY EMISSION
SORPTION
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties