Evidence for coexistence of the superconducting gap and the pseudo - gap in Bi-2212 from intrinsic tunneling spectroscopy
V. M. Krasnov, A. Yurgens, D. Winkler, P. Delsing, T. Claeson
Abstract
We present intrinsic tunneling spectroscopy measurements on small Bi2Sr2CaCu2O8+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 Tc, while the pseudo-gap exists both above and below Tc. Our observation implies that the superconducting and pseudo-gaps represent different coexisting phenomena.
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