Raman study of oxygen in the oxide superconductor Bi2CaSr2Cu2O8+δ
Y. H. Shi, M. J. G. Lee, M. Moskovits, R. Carpick, A. Hsu, B. W. Statt, Z. Wang
DOI 10.1103/PhysRevB.45.370 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The zero-resistance temperature of the high-Tc oxide superconductor Bi2CaSr2Cu2O8+δ (2:1:2:2) can be significantly increased by annealing at 500 °C in an oxygen-reduced environment. Raman spectroscopy of high-density sintered samples shows that processing the material in this way increases the strength of the Raman peak of highest frequency (650 cm−1), leaving the strengths of the other oxygen peaks unchanged. The Raman data confirm that the mobile oxygen atoms are located in the bismuth layer and support those models of oxygen structure in which excess oxygen is incorporated interstitially. They provide evidence that the incommensurate-to-commensurate transition observed in electron diffraction in the vicinity of 500 °C is associated with a loss of oxygen from the bismuth layer.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2CaSr2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | zero_resistance |
| Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| Bi2CaSr2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | zero_resistance |
| Bi2CaSr2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | onset |
Similar papers
Temperature dependence of electronic Raman-scattering spectra in superconducting Bi2Sr2CaCu2O8+δ single crystals
similarity 0.96A. Yamanaka et al.
Source status unknown — claims are unverified
Raman scattering spectra of superconducting Bi2Sr2CaCu2 O8 single crystals
similarity 0.96D. Kirillov et al.
Source status unknown — claims are unverified
Raman scattering from the Bi2Sr2CaCu3O8+y superconductor
similarity 0.96L. A. Farrow et al.
Source status unknown — claims are unverified
Raman study of carrier-overdoping effects on the gap in high-Tc superconducting cuprates
similarity 0.95T. Masui et al.
Source status unknown — claims are unverified
Infrared reflectivity and vibrational structure of superconducting Bi2Sr2CaCu2O8+x
similarity 0.95Oscar E. Piro et al.
Source status unknown — claims are unverified
Superconductivity-induced resonant Raman scattering in multilayer high-Tc superconductors
similarity 0.94Mikhail Limonov et al.
Source status unknown — claims are unverified