Remarks about hysteresis in superconductivity modelling

Abstract

Hysteresis is not a property of the constitutive laws of superconductors, but an observed macroscopic property of some devices, including superconductive material, which one uses in order to access a key parameter in modelling, namely the critical current density. The paper aims at clarifying these issues, by exposing the relation between the critical current density and the so-called `magnetic moment' of a superconductive sample.