  The high anisotropy in RO1-aFaBiS2 (R denotes a rare-earth element)
superconductors demonstrates their potential use as intrinsic Josephson
junctions, considering the weak coupling among BiS2-PrO(F)-BiS2
(superconducting-normal-superconducting) layers along the c-axis. We grew
PrO1-aFaBiS2 single crystals using CsCl/KCl flux. The superconducting
anisotropies of the grown single crystals were estimated to be approximately
40-50 from the effective mass model. The c-axis transport properties were
characterized using single-crystal s-shaped intrinsic Josephson junctions with
a focused ion beam. Along the c-axis, the crystals showed zero resistivity at
2.7 K and a critical current density of 1.33*10^3 A/cm2 at 2.0 K. The
current-voltage curve along the c-axis displayed hysteresis. The c-axis
transport measurements under a magnetic field parallel to the ab-plane revealed
a "lock-in" state due to the Josephson vortex flow, indicating that BiS2
superconductors are promising candidates for intrinsic Josephson junctions.
