We study thermal fluctuation phenomena in small Bi-2212 intrinsic Josephson junctions. Being able to measure switching currents of a {\it single} intrinsic junction, we observe that it's statistics can be very well described by thermal activation from a periodic Josephson potential with the sinusoidal current-phase relation. This is a direct evidence for the dc-intrinsic Josephson effect and the first unambiguous confirmation of the tunnelling nature of interlayer transport in strongly anisotropic high temperature superconductors. Furthermore, the fluctuation-free critical current, extracted from the analysis of switching current statistics, exhibits a temperature dependence typical for superconductor- insulator- superconductor tunnel junctions.
@article{arxiv.cond-mat/0501664,
title = {Probing the intrinsic Josephson potential in Bi-2212 by thermal activation},
author = {V. M. Krasnov and T. Bauch and P. Delsing},
journal= {arXiv preprint arXiv:cond-mat/0501664},
year = {2009}
}