Critical currents in frustrated two-dimensional Josephson arrays

摘要: Using the peak in dynamic resistance versus current to indicate intrinsic critical {ital I}{sub c}0}, magnetic-field dependence of c}0} two-dimensional Josephson junction arrays has been inferred from differential measurements at finite voltages. This is particularly clear when a magnetic-field-induced vortex superlattice strongly commensurate with underlying lattice. At weakly fields, dV}/{ital dI} rises sharply approximately 10% zero-field qualitative agreement prediction Lobb et} al}. (Phys. Rev. B 27, 150 (1983)) for pinning isolated vortices. New exact calculations are presented cases f}=1/2 and 1/3 ({ital f} average number flux quanta per cell array), which agree well our experimental measurements. Implications these results effect boundary conditions computer simulations on small also noted.