Vortex Matter in Mesoscopic Superconducting Disks and Rings

TL;DR

This paper investigates phase transitions in mesoscopic superconducting disks and rings under magnetic fields using Ginzburg-Landau theory, revealing non-quantized flux and different vortex states.

Contribution

It provides a self-consistent analysis of vortex states and phase transitions in mesoscopic superconducting disks and rings, highlighting non-quantized flux phenomena.

Findings

Identification of phase transitions between vortex states and normal state.

Discovery of non-quantized magnetic flux in disks with holes.

Characterization of giant and multi-vortex configurations.

Abstract

Phase transitions between different (i.e. giant and multi-vortex) superconducting states and between the superconducting-normal state of mesoscopic disks and rings are studied in the presence of an external magnetic field by solving the two non-linear Ginzburg-Landau equations self-consistently. The flux through a circular disk with a hole in the middle is not quantized.