Effect of External Current on the Magnetization of Non-Ideal Type II Superconductors

Abstract

The influence of the external current on the magnetization of non-ideal type II superconductors is explained. It is shown how in the mixed state the external current brings about a particular state of the critical distribution of flux threads allowing a finite total transport current. In the case where the external current is perpendicular to the external magnetic field, the reduction of the magnetization due to the external current and its dependence on the history of the application of current and field are explained quantitatively in Nb-Zr(25%) alloy. The transverve paramagnetic effect observed by LeBlanc is also discussed.