Evidence for coexistence of the superconducting gap and the pseudo - gap   in Bi-2212 from intrinsic tunneling spectroscopy
  We present intrinsic tunneling spectroscopy measurements on small Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$ mesas. The tunnel conductance curves show both sharp peaks at the superconducting gap voltage and broad humps representing the $c$-axis pseudo-gap. The superconducting gap vanishes at $T_c$, while the pseudo-gap exists both above and below $T_c$. Our observation implies that the superconducting and pseudo-gaps represent different coexisting phenomena. 
V.M.Krasnov, A.Yurgens, D.Winkler, P.Delsing and T.Claeson