%0 Journal Article %T Optical studies of charge dynamics in the optimally-doped Bi2212 and the non-superconducting cobaltate single crystals %A J. J. Tu %A C. C. Homes %A G. D. Gu %A D. N. Basov %A S. M. Loureiro %A R. J. Cava %A M. Strongin %J Physics %D 2001 %I arXiv %X An analysis of the frequency-dependent scattering rate reveals signatures of the superconducting gap as well as the pseudogap in high-T_c cuprates. These features can be identified in the temperature-dependent spectral function W(omega), inverted from the optical data of the optimally-doped Bi2212 using an experimentally unambiguous method that shows the behavior of both the maxima and minima in the spectral function. %U http://arxiv.org/abs/cond-mat/0104208v1