Flux transitions in a superconducting ring

TL;DR

This paper numerically investigates flux transitions in a superconducting ring, revealing large flux jumps near critical fields and providing insights into experimental observations.

Contribution

It introduces a numerical analysis of flux transitions in superconducting rings, predicting large flux jumps near critical fields.

Findings

Giant flux jumps are predicted near critical fields.

The study partially explains experimental flux transition features.

Current and free energy behaviors are characterized during flux changes.

Abstract

We perform a numeric study of the flux transitions in a superconducting ring at fixed temperature, while the applied field is swept at an ideally slow rate. The current around the ring and its free energy are evaluated. We partially explain some of the known experimental features, and predict a considerably large new feature: in the vicinity of a critical field, giant jumps are expected.