Abstract

We measured the in-plane optical reflectivity spectra of Bi2Sr2CaCu2O8+δ single crystals from under-to overdoped regime. Appreciable residual conductivity is observed in the low energy region even in the superconducting state well below Tc. Comparing with the results of the Scanning Tunneling Microscope/Scanning Tunneling Spectroscopy (STM/STS) measurement made on the same set of crystals, we discuss how the observed gap inhomogeneity in the CuO2 plane affects the optical spectrum.

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