For current densities above the critical current density, the vortices (the small nonsuperconducting regions of the sample) start to slip or move.
For current densities above the critical current density, the vortices (the small nonsuperconducting regions of the sample) start to slip or move.
一旦这些区域开始移动，能量就会损耗，也就是说材料的电阻值不再为零。