Abstract
The electronic Raman scattering (ERS) spectrum of the high-temperature superconductor Bi 2Sr 2CaCu 2O 8+ δ is studied as a function of cation substitution and oxygen content. In unsubstituted crystals with δ near and above that for the optimal T c, the ERS spectra show a redistribution of spectral weight below T c consistent with the opening of a superconducting energy gap at 2 Δ. At low oxygen concentrations and in cation substituted samples with optimal oxygen content, the pair-breaking peak is not observed, displaying instead “gapless” or “pseudogap” spectra. When cation substituted samples are post-annealed in high pressure oxygen, the 2 Δ peak remarkably appears.
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