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

TL;DR

This study provides direct evidence of the intrinsic Josephson effect in Bi-2212 by analyzing thermal activation phenomena, confirming the tunneling nature of interlayer transport in high-temperature superconductors.

Contribution

It offers the first unambiguous confirmation of the tunneling nature of interlayer transport in Bi-2212 through thermal fluctuation analysis of single intrinsic Josephson junctions.

Findings

Switching current statistics match thermal activation from a sinusoidal potential.

Critical current shows temperature dependence typical of SIS tunnel junctions.

First direct evidence of the dc-intrinsic Josephson effect in Bi-2212.

Abstract

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.