Current - voltage characteristics of break junctions of high-$T_c$ superconductors

Abstract

The current-voltage ($I$-$V$) characteristics of break junctions of polycrystalline La${}_{1.85}$Sr${}_{0.15}$CuO${}_4$, Y${}_{0.75}$Lu${}_{0.25}$Ba${}_2$Cu${}_3$O${}_{7-\delta }$, Bi${}_{1.8}$Pb${}_{0.3}$Sr${}_{1.9}$Ca${}_2$Cu${}_3$O${}_x$ and composite YBa${}_2$Cu${}_3$O${}_{7-\delta }$ + Ag are investigated. The experimental $I$-$V$ curves exhibit the specific peculiarities of superconductor/normal-metal/superconductor junctions. The relation between an $I$-$V$ characteristic of network of weak links and $I$-$V$ dependencies of typical weak links is suggested to describe the experimental data. The $I$-$V$ curves of typical weak links are calculated by the Kümmel - Gunsenheimer - Nicolsky model considering the multiple Andreev reflections.

9 pages, 5 figures, 2 Tables

References in corpus (1)

• Description of hysteretic current-voltage characteristics of SNS junctions