Branching instability in the flux creep regime of type-II superconductors

TL;DR

This paper theoretically investigates the development of branching instability in type-II superconductors during flux creep, analyzing how thermal and electromagnetic perturbations evolve and under what conditions instability occurs.

Contribution

It introduces a linear analysis framework for understanding branching instability in superconductors with nonlinear current-voltage characteristics during flux creep.

Findings

Branching instability can occur under certain conditions in superconductors.

The study provides a theoretical basis for predicting instability onset.

Analysis of perturbation evolution in flux creep regime.

Abstract

We study theoretically the space-time evolution of the thermal and electromagnetic perturbation in a superconductor with a nonlinear current-voltage characteristics in the flux creep regime. On the basis of a linear analysis of a set of differential equations describing small perturbations of temperature and electromagnetic field, it is found that under some conditions a branching instability may occur in a superconductor sample.