Abstract
Micron scale stacked junctions have been fabricated from Bi 2Sr 2CaCu 2O 8 whiskers. For in plane size L less than 20 μm measurements of the critical current I c along the c-axis as a function of the parallel magnetic field H clearly demonstrate the intrinsic dc Josephson effect. For larger values of L a dimensional crossover to monotonic, size independent behavior of I c( H) is observed. Flux flow steps on current voltage characteristics of overlap stacks have been found in high parallel magnetic fields, due to the collective motion of Josephson vortex lattice.
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