 |
Center for Nonlinear Studies |
The understanding of vortex pinning in type-II superconductors is a central prerequisite for the development of high-performance superconductors. In this seminar, we will revisit the framework of strong pinning theory. In particular, we will discuss how time-dependent Ginzburg-Landau simulations can be used to study vortex pinning within and beyond the applicability limits of the conventional theory. As key results, we first find a wide field/defect-density range where the pinning landscape disorders the vortex state although vortex-vortex interactions are still strong. Second, two nearby defects (an event with vanishing probability in the strong pinning picture) produce crucial corrections to the critical current behavior. Finally, a novel type of peak effect, observed for large inclusions, is caused by multiple occupancy of defects.
Host: Leonardo Civale