DIMENSIONALITY CROSSOVER AND MAGNETIC-FIELD FRUSTRATION IN DISORDERED PROXIMITY COUPLED ARRAYS

We have fabricated site-diluted disordered arrays of proximity coupled superconducting junctions. We have measured the critical current superconducting phase boundary, Ic(H), as a function of disorder and found that the higher order frustration-induced structure is significantly reduced with the introduction of as little as 10% disorder. Lower order structure, however, persists out to higher disorder than indicated by simulations. We see no evidence of a dimensionality crossover in the phase boundary for our disordered arrays, in agreement with recent data on percolating superconducting wire networks. © 1990, Elsevier Science Publishers B.V. (North-Holland). All rights reserved.