Evidence of the effect of the apical oxygen on the superconductivity of Y1-xCaxBa2Cu3Oy. An O-1s X-ray absorption spectroscopy study

C. H. Hsieh, C. N. Chang, S. B. Lee, H. C.I. Kao, C. H. Chin

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Abstract

Two series of Y1-xCaxBa2Cu3Oy, x = 0.05 and 0.10, have been studied by O-1s X-ray absorption near-edge spectroscopy using synchrotron radiation. The characteristics of the decrease of Tc with the decrease of the oxygen content, y, are found different for the series of x = 0.05 and x = 0.10. The former reveals the importance of the holes on the apical oxygen sites. Through a cross examination between these two series of samples, direct evidences are observed that the reduction of the number of holes on the apical oxygen sites has a negative effect on the superconductivity in the underdoped region of Ca-doped YBCO system.

Original languageEnglish
Pages (from-to)314-320
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume384
Issue number3
DOIs
Publication statusPublished - 2003 Feb 1

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Keywords

  • High-T superconductor
  • X-ray absorption spectrum
  • YCaBaCuO

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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