Identification of the vortex glass phase by harmonics of the AC magnetic susceptibility

TL;DR

This paper demonstrates that analyzing the harmonics of AC magnetic susceptibility, especially through Cole-Cole plots, can effectively distinguish between vortex glass and creep phases in superconductors.

Contribution

It introduces a numerical simulation approach to differentiate vortex glass and creep phenomena using harmonic susceptibility and Cole-Cole plot analysis.

Findings

Harmonics of susceptibility vary distinctly between phases.

Cole-Cole plots reveal clear differences with frequency.

Simulation confirms the method's effectiveness.

Abstract

We compared the AC magnetic susceptibility behaviour for the vortex glass phase and for the creep phenomena with an inhomogeneous pinning potential. The temperature dependence of the harmonics of the susceptibility have been numerically simulated with these two models, and we studied them as a function of the frequency, in terms of Cole-Cole plots. From our analysis we show that it is possible to distinguish between the two different phases, because of their clear differences in the Cole-Cole plots behaviour with the frequency.