Shift of the apical oxygen of the (formula presented) octahedron and the superconductivity in (formula presented) systems

Yan Hongjie, Zhiqiang Mao, Xu Gaojie

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1 Citation (Scopus)

Abstract

The Raman scattering, electron diffraction (ED), and resistivity are measured for a nominal composition of (Formula presented) system. It is found that the peaks of (Formula presented) 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 wavelength 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 (Formula presented) octahedron induced by the decrease of Sr content in (Formula presented) 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-semiconductor transition.

Original languageEnglish (US)
Pages (from-to)8459-8462
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number13
DOIs
StatePublished - Jan 1 1999

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Superconductivity
Electron diffraction
Raman scattering
superconductivity
Oxygen
electron diffraction
shift
oxygen
Raman spectra
electrical resistivity
Metals
Modulation
Semiconductor materials
vibration mode
oxygen atoms
Wavelength
Atoms
low frequencies
Chemical analysis
modulation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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abstract = "The Raman scattering, electron diffraction (ED), and resistivity are measured for a nominal composition of (Formula presented) system. It is found that the peaks of (Formula presented) 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 wavelength 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 (Formula presented) octahedron induced by the decrease of Sr content in (Formula presented) 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-semiconductor transition.",
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T1 - Shift of the apical oxygen of the (formula presented) octahedron and the superconductivity in (formula presented) systems

AU - Hongjie, Yan

AU - Mao, Zhiqiang

AU - Gaojie, Xu

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Y1 - 1999/1/1

N2 - The Raman scattering, electron diffraction (ED), and resistivity are measured for a nominal composition of (Formula presented) system. It is found that the peaks of (Formula presented) 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 wavelength 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 (Formula presented) octahedron induced by the decrease of Sr content in (Formula presented) 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-semiconductor transition.

AB - The Raman scattering, electron diffraction (ED), and resistivity are measured for a nominal composition of (Formula presented) system. It is found that the peaks of (Formula presented) 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 wavelength 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 (Formula presented) octahedron induced by the decrease of Sr content in (Formula presented) 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-semiconductor transition.

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