Deformation-induced thermomagnetic effects in a twisted weak-link-bearing superconductor

TL;DR

This paper predicts novel thermomagnetic effects in twisted superconductors with Josephson contacts, including torsional analogs of Josephson piezomagnetism and heat flux-induced magnetic moments, expanding understanding of superconductor responses to mechanical and thermal stimuli.

Contribution

It introduces new theoretical predictions of deformation-induced thermomagnetic phenomena in twisted superconductors with Josephson junctions, including effects analogous to Zavaritskii and Josephson piezomagnetism.

Findings

Prediction of torsional Josephson piezomagnetism.

Proposal of heat flux-induced magnetic moments in twisted superconductors.

Discussion of experimental conditions for observing these effects.

Abstract

Based upon the recently introduced thermophase and piezophase mesoscopic quantum effects in Josephson junctions, several novel phenomena in a twisted superconductor (containing a small annular SIS-type contact) under influence of thermal gradient and applied magnetic field are predicted. Namely, we consider a torsional analog of Josephson piezomagnetism (and related magnetomechanical effect) as well as a possible generation of a heat flux induced magnetic moment in a weakly-coupled superconductor under a torsional deformation (analog of Zavaritskii effect) along with the concomitant phenomena of piezothermopower and piezothermal conductivity. The conditions under which the predicted effects can be experimentally measured in conventional superconductors and nanostructured materials with implanted Josephson contacts are discussed.