Infinite series models of flux relaxation and vortex penetration constructed at critical points and their unification

TL;DR

This paper develops and unifies new polynomial and inverse models for flux relaxation and vortex penetration in type-II superconductors, based on expansions around critical points rather than zero current or field.

Contribution

It introduces a novel approach to model flux phenomena at critical points, unifying previous models and expanding the theoretical framework for superconductor analysis.

Findings

Constructed polynomial models at critical points.

Developed inverse models expanding around critical points.

Unified flux relaxation and vortex penetration models.

Abstract

The information about the current-carrying ability of a type-II superconductor can be obtained by studying the flux relaxation and vortex penetration phenomena in the superconductor. In early studies, the infinite series models of the flux relaxation and vortex penetration phenomena were constructed at a vanishing current density and vanishing internal field, respectively. However, this is not the only possibility. Here it is shown that one can reconstruct the theoretical models at the critical points. The new polynomial model of the flux relaxation (vortex penetration) phenomenon was constructed by expanding the vortex activation energy as an infinite series of the current density (internal field) about the critical current density (equilibrium internal field). The unification of the polynomial models was proposed. The inverse model of the flux relaxation (vortex penetration) phenomenon was also constructed by expanding the vortex activation energy as an infinite series of the inverse current density (inverse internal field) about the critical current density (equilibrium internal field).