Magnetization asymmetry of type-II superconductors in high magnetic fields

TL;DR

This paper develops a model to explain magnetization asymmetry in type-II superconductors, fitting experimental data for porous and textured Bi-based superconductors, and identifies size-dependent conditions for thermal equilibrium magnetization.

Contribution

It introduces a field distribution model that accounts for magnetization asymmetry and fits experimental magnetization loops of specific superconductors.

Findings

Magnetization asymmetry is linked to inhomogeneous pinning force distribution.

Thermal equilibrium magnetization depends on crystal size, temperature, and magnetic field.

The model successfully fits experimental magnetization loops.

Abstract

Inhomogeneous distribution of the pinning force in superconductor results in a magnetization asymmetry. A model considering the field distribution in superconductor was developed and symmetric and asymmetric magnetization loops of porous and textured Bi_{1.8}Pb_{0.3}Sr_{1.9}Ca_{2}Cu_{3}O_{x} were fitted. It is found that the thermal equilibrium magnetization realizes in crystals smaller than some size depending on temperature and magnetic field.