Secondary peak on asymmetric magnetization loop of type-II superconductors

TL;DR

This paper models the asymmetric magnetization loops with a secondary peak in type-II superconductors using an extended critical state model, providing analytical expressions for the peak and asymmetry features.

Contribution

It introduces a parameterization of asymmetric magnetization loops with a second peak based on the extended critical state model, including new expressions for peak and surface layer effects.

Findings

Successfully reproduces asymmetry of secondary peak in magnetization curves

Provides analytical expressions for peak height and surface layer depth

Enhances understanding of magnetic behavior in type-II superconductors

Abstract

Asymmetric magnetization loops with a second peak effect were parameterized by the extended critical state model. The magnetic field distribution in a sample is considered. Expression is suggested for a peak of the critical current density and corresponding depression on field dependence of the depth of surface layer with equilibrium magnetization. These functions determine the width and the asymmetry of a magnetization loop. Asymmetry of the secondary peak height on magnetization branches for increasing and decreasing field is reproduced on the computed magnetization curves.