Second harmonics and compensation effect in ceramic superconductors
Mai Suan Li
TL;DR
This paper models ceramic superconductors using a 3D Josephson junction lattice to study second harmonics and the compensation effect, revealing their connection to the chiral glass phase and paramagnetic Meissner effect.
Contribution
It introduces a lattice model with finite self-conductance to explain the nonlinear susceptibility and compensation effect in ceramic superconductors.
Findings
The compensation effect is linked to the chiral glass phase.
The model reproduces the paramagnetic Meissner effect observed in experiments.
Monte Carlo simulations confirm the theoretical predictions.
Abstract
A three-dimensional lattice of the Josephson junctions with a finite self-conductance is employed to model the ceramic superconductors. The nonlinear ac susceptibility and the compensation effect are studied by Monte Carlo simulations in this model. The compensation effect is shown to be due to the existence of the chiral glass phase. We demonstrate, in agreement with experiments, that this effect may be present in the ceramic superconductors which show the paramagnetic Meissner effect.
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