Effects of percolation on the superconductor-insulator transition in thin films

Thin films of superconductors are known to undergo a quantum phase transition into the insulating state as a function of disorder and magnetic field, but the nature of the transition has been debated for decades. In order to investigate the effects of percolation and rare superconducting regions on the superconductor-insulator transition in thin films, we have fabricated a series of nanostructured films with controlled vicinity to the percolation threshold. We will show how the measurements of resistance as a function of temperature and magnetic field correlate to the physical texture of the films.