Raman spectra of YBa2Cu3Ox superconductors with different oxygen content
D. Kirillov, J. P. Collman, J. T. McDevitt, G. T. Yee, M. J. Holcomb, I. Bozovic
DOI 10.1103/PhysRevB.37.3660 · Physical Review B
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Abstract
The Raman spectra of high-purity samples of YBa2Cu3Ox were studied as a function of oxygen content 6<x<7. The most important changes occurred in the spectral range corresponding to the stretching vibrations of Cu-O bonds. At the transition from the superconducting orthorhombic to the semiconducting tetragonal phase, x=6.5, the intensity of the highest-frequency mode at 632 cm−1 drops drastically as oxygen is removed from the Cu(1)-O(1) chains. The two Raman modes at 440 and 500 cm−1 merge into a single mode at 472 cm−1. The correlation between the phase transition and changes in the spectra is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| YBa2Cu3O6.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | unknown |
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