Dislocation induced ac Josephson effect in high-T_c superconductors

TL;DR

This paper proposes a novel mechanism for the ac Josephson effect in high-T_c superconductors, driven by dislocation motion under mechanical stress, with estimated voltages and frequencies relevant to experimental observation.

Contribution

It introduces a new scenario where dislocation dynamics induce the ac Josephson effect in high-T_c superconductors, expanding understanding of superconductor behavior under mechanical load.

Findings

Estimated voltages of a few picovolts due to dislocation motion

Corresponding Josephson frequency around 10 kHz

Dislocation-induced ac Josephson effect is theoretically plausible

Abstract

A possible scenario for an ac Josephson effect initiated by the flow of dislocations through a mechanically loaded but electrically unbiased superconductor is proposed. The characteristic voltages due to the motion of dislocations in loaded (under the applied stress of 10^7N/m^2) YBCO crystals are estimated to be of the order of a few picovolts (which corresponds to the Josephson frequency of 10 kHz).