Critical Current Enhancement due to an Electric Field in a Granular d-Wave Superconductor

TL;DR

This paper investigates how applying a strong electric field can enhance the critical current in granular d-wave superconductors with disorder, aligning with experimental observations in high-temperature ceramic superconductors.

Contribution

It demonstrates that a strong electric field increases the critical current in d-wave granular superconductors with random π-junctions, a novel insight into electric field effects on such materials.

Findings

Critical current always increases after electric field application.

Change in voltage as a function of electric field matches experimental data.

Enhancement occurs regardless of electric field polarity.

Abstract

We study the effects of an electric-field in the transport properties of bulk granular superconductors with different kinds of disorder. We find that for a d-wave granular superconductor with random $\pi$-junctions the critical current always increases after applying a strong electric field, regardless of the polarity of the field. This result plus a change in the voltage as a function of the electric field are in good agreement with experimental results in ceramic high T_c superconductors.