High-resolution oxygen-K absorption study of Bi2Sr2Ca1-xYxCu2O8 (x=0.0 and 0.6) and YBa2Cu2O7-δ (δ=0.0-0.7)

Takashi Takahashi, S. Suzuki, T. Kusunoki, S. Sato, H. Katayama-Yoshida, A. Yamanaka, F. Minami, S. Takekawa

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14 Citations (Scopus)

Abstract

High-energy-resolved oxygen K absorption spectra of Bi2Sr2Ca1-xYxCu2O8 (x=0.0 and 0.6) single crystals and YBa2Cu3O7-δ (δ=0.0-0.7) ceramics were reported. The experimental results show that (1) the electronic states at the Fermi level in superconductor has a dominant O2px,y symmetry, (2) the lowest unoccupied states in nonsuperconductor is located about 1 eV above the Fermi level and also has a strong in-plane symmetry, and (3) hole-doping causes a transfer of weight of the electronic states from the lowest unoccupied states (upper Hubbard band) to the mid-gap states produced by hole-doping at the Fermi level.

Original languageEnglish
Pages (from-to)1057-1058
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume185-189
Issue numberPART 2
DOIs
Publication statusPublished - 1991 Dec 1

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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