XPS and XANES study on Pb2Sr2YCu3O8+δ and PbBaSr(YCa)Cu3O7+δ

Masayasu Nagoshi, Ayako Tokiwa-Yamamoto, Yasuhiko Syono, Yasuo Fukuda, Masashi Tachiki

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The charge distribution in Pb2Sr2YCu3O8+δ and PbBaSrY1-xCaxCu3O7+δ has been studied by X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure (XANES). The Cu 2p core-level and the Pb M3 XANES show that the valences of Cu and Pb in the blocking layers are + 1 and + 2, respectively, for the oxides synthesized in a reducing atmosphere (δ = 0). The valences of Cu and Pb increase after oxidation by annealing in O2 gas. On the other hand, the substitution of Ca for Y (x = 0.2) hardly changes the valences of Cu and Pb. The core-levels of Ba, Sr and Y are not changed in the binding energy by the oxidation, but are shifted to the lower-binding-energy side by the substitution. These results will be discussed in terms of charge distributions in the crystal structures before and after the oxidation and substitution.

Original languageEnglish
Pages (from-to)503-507
Number of pages5
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume88-91
Publication statusPublished - 1998 Mar 1

Keywords

  • Charge distribution
  • Pb-based high-T
  • Superconductor
  • X-Ray absorption near-edge structure
  • X-Ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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