Electronic Raman Scattering in Superconducting Cuprates

We show that the novel features observed in Raman experiments on optimally doped and underdoped Bi2212 compounds in B sub (1g) geometry can be explained by a strong fermionic self-energy due to the interaction with spin fluctuations. We compute the Raman intensity R (omega) progressively deviates, with decreasing doping, from that in a fermi-gas due to increasing contribution from the fermionic self-energy. We also show that the final state interaction increases with decreasing doping and gradually transforms the 2 DELTA peak in the superconducting state into a pseudo resonance mode below 2 DELTA. We argue that these results agree well with the experimental data for Bi2212.