Shift of the apical oxygen of the CuO6 octahedron and the superconductivity in Bi1.8Pb0.2Sr2-xCuOy systems

Hongjie Yan, Zhiqiang Mao, Gaojie Xu, Yuheng Zhang

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The Raman scattering, electron diffraction (ED), and resistivity are measured for a nominal composition of Bi1.8Pb0.2Sr2-xCuOy system. It is found that the peaks of Alg vibrational modes of the oxygen atom in a SrO layer along the c axis are broadened, the intensity is reduced, and the position of the peak shifts toward low frequency in Raman spectra as Sr content decreases. The reduction of the incommensurate modulation wave-length is observed by ED measurements with the decrease in Sr content. This suggests that the results in Raman spectra and ED are attributed to the shift of the apical oxygen in CuO6 octahedron induced by the decrease of Sr content in Bi1.8Pb0.2Sr2-xCuOy system. The resistivity measurements show that the shift of the apical oxygen not only brings about the disappearance of superconductivity, but also induces a metal-semiconductortransition.

Original languageEnglish (US)
Pages (from-to)8459-8462
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
StatePublished - 1999

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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