Parallel core and valence photoemission studies of nominal (Bi0.9Pb0.1)2Sr2Ca2Cu3O10+x

1 September 1989

journal article
Published by IOP Publishing in Superconductor Science and Technology

Vol. 2 (3) , 185-191
https://doi.org/10.1088/0953-2048/2/3/007

Abstract

Clean surfaces of ceramic samples of the oxide superconductor (Bi_0.9Pb_0.1)₂Sr₂Ca₂Cu₃O_10+x have been prepared by in situ annealing under pure oxygen at atmospheric pressure inside a UHV system. Scraping of these surfaces under argon is shown to re-expose contaminated grain boundaries, whilst oxygen annealing removes this contamination. Analysis of Pb 4f XPS peak shapes suggests that the metallic character of the Bi-O planes is enhanced by Pb²⁺ substitution for Bi³⁺. Ultraviolet photoemission spectra indicate some small changes in the valence band DOS from the Bi₂(Sr,Ca)₃Cu₂O_8+x superconductors; in particular, the density of states at E_f is significantly enhanced, as expected from the considerably higher T_c of these materials.

Keywords

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