We show by resonance effects in HgBa₂CuO_4+δ (Hg-1201) and by Zn substitutions in YBa₂Cu₃O_7-δ (Y-123) compounds that the fully symmetric Raman spectrum has two distinct electronic contributions. The A1g response consists of the superconducting pair-breaking peak at the 2Δ energy and a collective mode close to the magnetic-resonance energy. These experimental results reconcile the d-wave model to the A1g Raman response function insofar as a collective mode that is distinct from the pair-breaking peak is present in the A1g channel.
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Tacon et al. (2005) studied this question.
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