Vortex phase diagram for mesoscopic superconducting disks

TL;DR

This paper numerically investigates phase transitions in mesoscopic superconducting disks, revealing a vortex phase diagram with re-entrant behavior between multi-vortex and giant vortex states.

Contribution

It provides the first detailed vortex phase diagram for mesoscopic disks, highlighting the transition from multi-vortex to giant vortex states with varying thickness and magnetic field.

Findings

Smooth transition from multi-vortex to giant vortex state

Re-entrant behavior in vortex phase diagram

Dependence of vortex states on disk thickness and magnetic field

Abstract

Solving numerically the 3D non linear Ginzburg-Landau (GL) equations, we study equilibrium and nonequilibrium phase transitions between different superconducting states of mesoscopic disks which are thinner than the coherence length and the penetration depth. We have found a smooth transition from a multi-vortex superconducting state to a giant vortex state with increasing both the disk thickness and the magnetic field. A vortex phase diagram is obtained which shows, as function of the magnetic field, a re-entrant behavior between the multi-vortex and the giant vortex state.