Peculiar hole doping by Ca substitution in cuprate superconductors

J. Y. Lin, P. C. Chung, S. J. Liu, C. C. Hsiang, P. H. Lin, J. M. Lee, J. M. Chen, K. H. Wu, Y. S. Gou

Research output: Contribution to journalArticle

Abstract

The doping effect of Ca substitution in Y0.7 Ca0.3Ba2 Cu3Oy has been studied for y=6.9 and 6 by the x-ray absorption near edge spectroscopy (XANES). While Ca doping leads to an obvious increase in hole concentration in the CuO2 planes in Y0.7 Ca0.3 Ba2 Cu3 O6.9, XANES indicates absence of this doping effect in Y0.7 Ca0.3 Ba2 Cu3 O6. These two contradict results suggest that the doping effect by Ca substitution could be sensitive to the oxygen content when y ∼ 6.0. Comparisons with others' works are made.

Original languageEnglish
Pages (from-to)337-341
Number of pages5
JournalJournal of Low Temperature Physics
Volume131
Issue number3-4
DOIs
Publication statusPublished - 2003 May

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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