Raman scattering spectra of a superconducting Pb2Sr2Y0.75Ca0.25Cu3O8+δ single crystal
Ran Liu, M. Cardona, B. Gegenheimer, E. T. Heyen, C. Thomsen
DOI 10.1103/PhysRevB.40.2654 · Physical Review B
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Abstract
Raman Spectra of a superconducting Pb2Sr2Y0.75Ca0.25Cu3O8+δ single crystal (Tc≊20 K) have been measured at different temperatures between 10 and 300 K. Through their polarization properties, the Raman features observed at 90, 150, 240, 430, 480, and 570 cm−1 are identified as the six Ag modes, while the mode positioned at 325 cm−1 has B1g symmetry. The components of the Raman tensor for these phonons have been determined. The frequencies and assignments obtained here correlate well with lattice-dynamical calculations for Bi2Sr2CaCu2O8. The possible effect of the distortion of the oxygen atom from the ideal rocksalt-type structure of the PbO layers is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb2Sr2Y0.75Ca0.25Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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