Two Distinct Electronic Contributions in the Fully Symmetric Raman Response of High Tc Cuprates
M. Le Tacon, A. Sacuto, D. Colson
Abstract
We show by non resonant effect in HgBa2CuO4+δ (Hg-1201)and by Zn substitutions in YBa2Cu3O7-δ (Y-123) compounds that the fully symmetric Raman spectrum has two distinct electronic contributions. The A1g response consists in 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 in so far as a collective mode that is distinct from the pair breaking peak is present in the A1g channel.
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