Electronic Raman-scattering study of low-energy excitations in single and double CuO2-layer Tl-Ba-(Ca)-Cu-O superconductors
Moonsoo Kang, G. Blumberg, M. V. Klein, N. N. Kolesnikov
Abstract
Low energy Raman continuum and the redistribution of the continuum to a peak (2Δ-peak) in the superconducting state have been studied in Tl-Ba-(Ca)-Cu-O superconductors with single (Tl-2201) and double (Tl-2212) CuO2 layer. The 2Δ/kBTc ratios in A1g and B1g symmetries are larger for Tl-2212 than for Tl-2201. The B1g/A1g gap ratio is also larger in Tl-2212. The A1g intensities of the continuum and the 2Δ-peak are significantly weaker than the B1g intensities in Tl-2201, but are comparable in Tl-2212. This shows that the Coulomb screening is much stronger in Tl-2201. The change from Tl-2201 to Tl-2212 of the normalized A1g 2Δ-peak intensity is identical within experimental error to that of normalized A1g continuum intensity. This suggests that the excitations forming the 2Δ-peak and the continuum couple to light by the same mechanism.
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