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We performed Raman experiments on superconducting ${\rm Bi_2 Sr_2 (Ca_{1-x}Y_x) Cu_2 O_{8+\delta}}$ (Bi-2212) and ${\rm YBa_{2} Cu_{3}O_{6+x}}$ (Y-123)single crystals. These results in combination with earlier ones enable us toanalyze systematically the spectral features in the doping range $0.07 \le p\le 0.23$. In $B_{2g}$ ($xy$) symmetry we find universal spectra and themaximal gap energy $\Delta_0$ to follow the superconducting transitiontemperature $T_c$. The $B_{1g}$ ($x^2-y^2$) spectra in Bi-2212 show ananomalous increase of the intensity towards overdoping, indicating that thecorresponding energy scale is neither related to the pairing energy nor to thepseudogap, but possibly stems from a symmetry breaking transition at the onsetpoint of superconductivity at $p_{\rm sc2} \simeq 0.27$.

Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates