Local structure and valence states in PbBaSrY1-xCaxCu3O7+δ and Pb2Sr2Y1-xCaxCu3O8+δ

H. Yamaguchi, H. Oyanagi, Ayako Yamamoto, Y. Syono

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Abstract

X-ray absorption fine structure on the Cu K and the Pb L3-edges of PbBaSrY1-xCaxCu3O7+δ and Pb2Sr2Y1-xCaxCu3O8+δ systems has been measured. In the oxygen-deficient phase with δ=0 of these systems, the Cu K-near-edge spectra evidence the existence of Cu1+ comprised in OCuO linear chains. The Cu K-edge position shifts to higher energy retaining the Cu1+ feature by substitution of Y3+ with Ca2+ in the oxygen-deficient phase, indicating that holes are supplied to the CuO2 basal planes of the pyramids. The Pb valence is found to be mixed states of 2+ and 4+ in the oxygen-rich phases with δ>1. The average Pb valence is estimated as 3.3+ and 3.04+ in PbBaSrYCu3O8.4 and Pb2Sr2YCu3O9.5, respectively.

Original languageEnglish
Pages (from-to)853-854
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume185-189
Issue numberPART 2
DOIs
Publication statusPublished - 1991 Dec 1
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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