Localization Effect in a 2D Superconducting Network without Disorder
  The superconducting properties of a two-dimensional superconducting wire network with a new geometry have been measured as a function of the external magnetic field. The extreme localization effect recently predicted for this periodic lattice is revealed as a suppression of the critical current when the applied magnetic field corresponds to half a flux quantum per unit cell. For this particular magnetic field, the observed vortex state configuration is highly disordered. 
B. Pannetier, C.C. Abilio, E. Serret, Th. Fournier, P. Butaud and J.   Vidal