Intrinsic tunneling spectroscopy in small Bi2212 mesas

Abstract

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 well above $T_c$. Our observation implies that the superconducting and pseudo-gaps represent different coexisting phenomena.

2 pages, 2 figures. Proc. "Electron Transport in Mesoscopic Systems" (Satellite conf. to LT22) 12-15 August 1999, Goteborg, Sweden, P85, pp.231-232