Raman scattering from high-Tc superconductors
R. Bhadra, T. O. Brun, M. A. Beno, B. Dabrowski, D. G. Hinks, J. Z. Liu, J. D. Jorgensen, L. J. Nowicki, A. P. Paulikas, Ivan K. Schuller, C. U. Segre, L. Soderholm, B. Veal, H. H. Wang, J. M. Williams, K. Zhang, M. Grimsditch
DOI 10.1103/PhysRevB.37.5142 · Physical Review B
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Abstract
Raman scattering experiments from high-Tc superconductors of the RBa2Cu3O7−d type, with R=Y, Pr, Nd, Eu, Gd, Dy, and Yb, are reported. Because of the great difficulty in obtaining single-phase samples, spectra from all starting compounds and other known phases of Y-Ba-Cu are presented. This systematic approach has allowed the identification of the lines observed in Raman spectra of the superconducting compounds as well as those of impurity phases. The lines originating from the superconducting yttrium compound were investigated as a function of quench temperature, and oxygen deficiency. Polarization studies on single crystals are also presented.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 57 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
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