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

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

研究成果: Article査読

2 被引用数 (Scopus)


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.

ジャーナルJournal of Electron Spectroscopy and Related Phenomena
出版ステータスPublished - 1998 3月 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 放射線
  • 原子分子物理学および光学
  • 凝縮系物理学
  • 分光学
  • 物理化学および理論化学


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