Shift of the apical oxygen of the CuO6 octahedron and the superconductivity in Bi1.8Pb0.2Sr2−xCuOy systems
Yan Hongjie, Mao Zhiqiang, Xu Gaojie, Zhang Yuheng
DOI 10.1103/PhysRevB.59.8459 · Physical Review B
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Abstract
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 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 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-semiconductor transition.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.8Pb0.2Sr2CuOy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.2 | Pressure not reported | zero_resistance |
| Bi1.8Pb0.2Sr2CuOy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.8 | Pressure not reported | zero_resistance |
| Bi1.8Pb0.2Sr2CuOy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.4 | Pressure not reported | zero_resistance |
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