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Electronic Raman scattering with in and out of (ab) plane polarizations havebeen performed on HgBa2Ca2Cu3O8+d in a slightly underdoped single crystal witha critical temperature Tc=122 K. We find that the d-wave pairing gap at theantinodes is higher in energy (14 kBTc) than in other cuprates and that itvaries very slowly up to Tc. This hints at a strong coupling nature of thepairing mechanism. Interestingly, we reveal that the pairing-gap feature in theRaman response displays a complex peak-dip-hump structure, in a fashionreminiscent of what observed by angle resolved photo-emission spectroscopy inBi2Sr2CaCu2O8+d (Bi-2212). We detect two other distinct superconducting peaksat 5kBTc and 7kBTc when probing respectively around the nodes and on the wholeFermi surface. Finally we establish that the pairing gap at the antinodes isdetected both for (ab) plane and for c-axis light polarizations. This showsthat the quasiparticle dynamics along the c-axis is intimately connected to theantinodal one in the (ab) plane.

Observing the Superconducting State of HgBa2Ca2Cu3O8+d Cuprate by Electronic Raman Scattering