Raman-active phonons and their doping dependence in Pb-based cuprate superconductors
Masato Kakihana, Minoru Osada, Atsuyoshi Inoue, Takashi Noji, Masatsune Kato, Yoji Koike, Mikael Käll, Lars Börjesson
DOI 10.1103/PhysRevB.60.6316 · Physical Review B
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Abstract
The phonon Raman spectra of (Pb2Cu)Sr2Y1−xCaxCu2O8+d (Pb3212), (Pb2Cu)Sr0.9La1.1CuO6+d (Pb3201), and (Pb0.5Cu0.5)Sr2YCu2O7+d (Pd1212) are investigated and phonon assignments compatible with the layer stacking sequences found in these Pb-based cuprate superconductors are proposed. In particular, the assignment of the 480- and 570−cm−1 phonons to oxygen in the PbO and SrO layers, respectively, is established. In the case of Pb3212 we find that the intensities of the CuO2-plane phonons decrease with increasing carrier concentration. This effect appears to be, at least partly, due to an interaction between the CuO2-plane phonons and Raman scattering associated with conduction carriers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb2CuSr2Y0.5Ca0.5Cu2O8+d Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | unknown |
| Pb2CuSr2Y1-xCaxCu2O8+d Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
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