Abstract
We report on the electronic Raman spectra excited and detected with photon polarization directions along the c-axis in Bi 2Sr 2CaCu 2O 8+ δ single crystals. In the normal state, a resonant electronic continuum extends to 1.5 eV and gains significant intensity as the incoming photon energy increases. Below T c , there is a low-frequency redistribution of the electronic continuum and the formation of a 2Δ peak in the superconducting state. The monotonic increase of 2Δ and 2 Δ/ k B T c with decreasing doping is unusual. In particular, this 2Δ feature, which has A 1 g symmetry, is found at higher frequencies than those seen in the planar symmetries for all doping levels studied.
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