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Investigation of the superconducting order parameter in Bi2Sr2CaCu2O8 single crystals.

Single crystals of Bi 2 Sr 2 CaCu 2 O 8+δ with different oxygen concentrations were investigated by Raman scattering. Dependent on the polarizations of the incident and the scattered light, the electronic spectra measured well below T c show either zero or finite intensity at small energy transfers. In oxygen-annealed crystals, the superconducting order parameter Δ is temperature dependent. In contrast, Δ is almost constant in the essentially two-dimensional argon-annealed samples