Josephson effect in a \(CeCoIn_5\) microbridge

Abstract

We report DC Josephson effects observed in a microbridge prepared from an individual crystalline growth domain of \(CeCoIn_5\) thin film. Josephson effects were observed by periodic voltage modulations under external magnetic field \(\Delta V(B)\) with the expected periodicity and by the temperature dependence of the Josephson critical current \(I_c(T)\). The shape of \(\Delta V(B)\) was found to be asymmetric, as it is expected for microbridges. The dependence \(I_c(T)\) follows the Ambegaokar-Baratoff relation, which is unexpected for microbridges. Features in the dynamical resistance curves were attributed to the periodic motion of Abricosov vortices within the microbridge.