Hole concentration in the three-CuO2-plane copper-oxide superconductor Cu-1223

M. Karppinen*, Hisao Yamauchi, Y. Morita, M. Kitabatake, T. Motohashi, R. S. Liu, J. M. Lee, Jinming Chen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

39 Citations (Scopus)

Abstract

Strongly overdoped samples of the three-CuO2-plane copper-oxide superconductor, CuBa2Ca2Cu3O8+z or Cu-1223, were obtained through high-pressure synthesis and post-annealed to various hole-doping levels so as to have the value of Tc range from 65 to 118K. A concomitant decrease in the average valence of copper from ∼2.20 to ∼2.05 was evidenced by means of wet-chemical and thermogravimetric analyses and Cu L-edge X-ray absorption near-edge structure (XANES) spectroscopy. The valence value as low as ∼2.05 that corresponds to the highest Tc (=118K) may be understood by taking into account multiple ways for holes to be distributed among the different Cu-O layers. In terms of actual chemical composition of the Cu-1223 phase, both Cu L-edge and O K-edge XANES results suggest that some portion of charge-reservoir copper atoms may have been replaced by CO, i.e., (Cu1-xCx)Ba 2Ca2Cu3O8+x+z. The variation range of excess oxygen was estimated at Δz≈0.3.

Original languageEnglish
Pages (from-to)1037-1043
Number of pages7
JournalJournal of Solid State Chemistry
Volume177
Issue number3
DOIs
Publication statusPublished - 1 Mar 2004
MoE publication typeA1 Journal article-refereed

Keywords

  • Cu-1223 high-T superconductor
  • Hole concentration
  • Oxygen content
  • Thermogravimetry
  • Wet-chemical analysis
  • XANES spectroscopy

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