Intrinsic dc Josephson effect in naturally layered stacked structures based on BSCCO 2212 single crystal whiskers

The dependences of the critical current I-c across the layers on a parallel magnetic field H have been studied on small area stacked junctions fabricated from perfect single crystal whiskers. The intrinsic de Josephson effect has been clearly demonstrated on structures with in-plane size L less than 20 mu m. A dimensional crossover to monotonic size-independent behavior of I-c(H) has been observed with increase in L. The decrease of I-c(H) in this region is proportional to root H in accordance with Fistul-Guliani theory [5].