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Low energy Raman continuum and the redistribution of the continuum to a peak(2\Delta-peak) in the superconducting state have been studied inTl-Ba-(Ca)-Cu-O superconductors with single (Tl-2201) and double (Tl-2212)CuO_2 layer. The 2\Delta/k_BT_c ratios in A_1g and B_1g symmetries are largerfor Tl-2212 than for Tl-2201. The B_1g/A_1g gap ratio is also larger inTl-2212. The A_1g intensities of the continuum and the 2\Delta-peak aresignificantly weaker than the B_1g intensities in Tl-2201, but are comparablein 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 A_1g 2\Delta-peakintensity is identical within experimental error to that of normalized A_1gcontinuum intensity. This suggests that the excitations forming the2\Delta-peak and the continuum couple to light by the same mechanism.Comment: 4 pages, PDF forma

physical review. b, condensed matter

Electronic Raman-scattering study of low-energy excitations in single and double<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-layer Tl-Ba-(Ca)-Cu-O superconductors

Electronic Raman-scattering study of low-energy excitations in single and doubleCuO2-layer Tl-Ba-(Ca)-Cu-O superconductors