Magnetic field induced polarization effects in intrinsically granular superconductors

TL;DR

This paper explores how magnetic fields induce polarization effects in granular superconductors, revealing phenomena like chemomagnetoelectricity, charge Meissner effects, and fishtail anomalies, with implications for high-T_c superconductor experiments.

Contribution

It introduces a model linking nanoscale dislocations to Josephson junctions, predicting new polarization phenomena in granular superconductors.

Findings

Discovery of chemomagnetoelectricity in granular superconductors

Prediction of charge Meissner paramagnetism at low fields

Identification of fishtail anomaly at high magnetic fields

Abstract

Based on the previously suggested model of nanoscale dislocations induced Josephson junctions and their arrays, we study the magnetic field induced electric polarization effects in intrinsically granular superconductors. In addition to a new phenomenon of chemomagnetoelectricity, the model predicts also a few other interesting effects, including charge analogues of Meissner paramagnetism (at low fields) and "fishtail" anomaly (at high fields). The conditions under which these effects can be experimentally measured in non-stoichiometric high-T_c superconductors are discussed.