Josephson vortices in annular-type intrinsic Josephson junctions

In the rectangular-, or, square-shaped intrinsic Josephson junctions (IJJs) of Bi2Sr2CaCu2O8+y, we found the periodic oscillations in Josephson vortex (JV) flow-resistance against the parallel magnetic fields with the c-axis current. We have tried to study the JV flow-resistance in the annular-type IJJs, and have found the oscillations with fundamental and superimposed periods determined by the effective widths of the junction perpendicular direction to the field and the current, which suggest that JVs are a three-dimensionally ordered state of JVs even in a non-continuous media, and well correlated each other along the junction.