Abstract
Using a sensitive inductive technique, we have measured the ac conductance of large two-dimensional triangular arrays of proximity effect Josephson junctions as a function of temperature and frustration parameter f (f = applied magnetic flux per unit cell of the array in units of the flux quantum). The ac conductance is periodic in f (with period one) and exhibits an extremely rich behaviour with structures corresponding to commensurability between array and vortex lattice at various rational values of f . At low temperatures, the strength of the most prominent structures is in satisfactory agreement with existing mean-field predictions. The observed norrowing of the structures at high temperatures is attributed to strong two-dimensional (2D) phase fluctuations.
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