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

H. Yamaguchi, H. Oyanagi, A. Tokiwa, Y. Syono

研究成果: Article査読

7 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)853-854
ページ数2
ジャーナルPhysica C: Superconductivity and its applications
185-189
PART 2
DOI
出版ステータスPublished - 1991 12 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

フィンガープリント

「Local structure and valence states in PbBaSrY<sub>1-x</sub>Ca<sub>x</sub>Cu<sub>3</sub>O<sub>7+δ</sub> and Pb<sub>2</sub>Sr<sub>2</sub>Y<sub>1-x</sub>Ca<sub>x</sub>Cu<sub>3</sub>O<sub>8+δ</sub>」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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