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

Masayasu Nagoshi, Ayako 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
Externally publishedYes

Fingerprint

X ray absorption
Substitution reactions
Core levels
X ray photoelectron spectroscopy
Charge distribution
photoelectron spectroscopy
substitutes
Binding energy
valence
Oxidation
charge distribution
oxidation
binding energy
x rays
Oxides
Crystal structure
Gases
Annealing
atmospheres
crystal structure

Keywords

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

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

XPS and XANES study on Pb2Sr2YCu3O8+δ and PbBaSr(YCa)Cu3O7+δ . / Nagoshi, Masayasu; Yamamoto, Ayako; Syono, Yasuhiko; Fukuda, Yasuo; Tachiki, Masashi.

In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 88-91, 03.1998, p. 503-507.

Research output: Contribution to journalArticle

Nagoshi, Masayasu ; Yamamoto, Ayako ; Syono, Yasuhiko ; Fukuda, Yasuo ; Tachiki, Masashi. / XPS and XANES study on Pb2Sr2YCu3O8+δ and PbBaSr(YCa)Cu3O7+δ . In: Journal of Electron Spectroscopy and Related Phenomena. 1998 ; Vol. 88-91. pp. 503-507.
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AU - Nagoshi, Masayasu

AU - Yamamoto, Ayako

AU - Syono, Yasuhiko

AU - Fukuda, Yasuo

AU - Tachiki, Masashi

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N2 - 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.

AB - 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.

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