Vortex structures in nano-scaled superconducting networks

Using the de Gennes-Alexander equation, we have investigated the stable vortex structures in finite superconducting networks (10 x 10 holes) with disordered wires under an external magnetic field. Vortex structures change gradually with increasing magnetic field. For the network with a disordered wire at the edge, vortices are not pinned disordered hole, but enter into the network at the holes with the disorder. But for the network with two disordered wires, the vortex enters at the hole between two disordered wires. This behavior can be considered as the result of the nonlocality of superconductivity. (C) 2010 Elsevier B.V. All rights reserved.