Abstract
The variations of the critical current ${I}_{c}$ across the layers as a function of the parallel magnetic field $H$ have been studied on small area stacked junctions fabricated from perfect single crystal B${\mathrm{i}}_{2}$S${\mathrm{r}}_{2}$CaC${\mathrm{u}}_{2}$${\mathrm{O}}_{8}$ whiskers. Intrinsic dc Josephson effect has been clearly demonstrated on structures with in-plane size $L$ less than $20\ensuremath{\mu}\mathrm{m}$. With $L$ increases, a dimensional crossover to monotonic size independent behavior of ${I}_{c}(H)$ has been observed. ${I}_{c}(H)$ decrease in this region is proportional to $\sqrt{H}$ in accordance with the Fistul-Giuliani theory.
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