Probing the intrinsic Josephson potential in Bi-2212 by thermal activation

Details Probing the intrinsic Josephson potential in Bi-2212 by thermal activation Probing the intrinsic Josephson potential in Bi-2212 by thermal activation

2005-01-27

arxiv.org/abs/cond-mat/0501664v1

Phys. Rev. B 72 (2005) 012512

Physics

Condensed Matter

Superconductivity

5 pages, 4 figs

Scientific paper

10.1103/PhysRevB.72.012512

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.

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