Electronic structure of ceramics and thin-film samples of high Tc Bi2Sr2CaCu2O8+δ superconductors: Effects of Ar+ sputtering, O2 exposure, and Rb deposition

Lindberg, P. A. P.; Soukiassian, P.; Shen, Z.-X.; Eom, C. B.; Lindau, I.; Spicer, W. E.; Geballe, T. H.
November 1988
Applied Physics Letters;11/14/1988, Vol. 53 Issue 20, p1970
Academic Journal
The electronic structure of bulk, and, for the first time, thin-film samples of the new class of high Tc Bi2Sr2CaCu2O8+δ superconductors, is investigated by photoemission spectroscopy using synchrotron radiation. Ar+ 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 O2 and/or Rb readily give rise to a number of new oxygen states in the valence band of Bi2Sr2CaCu2O8+δ. The Ar+-sputtered film is found to be more sensitive to adsorbates of O2 and Rb than the scraped bulk sample, as monitored by the Bi 5d core shifts and the oxygen-induced valence-band states.


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