Two distinct electronic contributions in the fully symmetric Raman response of high-Tc cuprates -: art. no. 100504

We show by resonance effects in HgBa2CuO4+delta (Hg-1201) and by Zn substitutions in YBa2Cu3O7-delta (Y-123) compounds that the fully symmetric Raman spectrum has two distinct electronic contributions. The A(1g) response consists of the superconducting pair-breaking peak at the 2 Delta energy and a collective mode close to the magnetic-resonance energy. These experimental results reconcile the d-wave model to the A(1g) Raman response function insofar as a collective mode that is distinct from the pair-breaking peak is present in the A(1g) channel.