Abstract
We report the first observation of Shapiro step effect in the Josephson vortex state of Bi 2 Sr 2 CaCu 2 O 8+ δ in high magnetic field (H⩾1 T ) . We observed phase locking between external microwave radiation and Josephson oscillation in whole stack of N intrinsic Josephson junctions at fields tilted with respect to the c -axis. Steps were observed in Josephson flux-flow (JFF) on the I – V characteristic at voltage V st = pNhν /2 e , with p integer, ν =45– 142 GHz . The amplitude of both Shapiro steps and Josephson critical current increase sharply with tilting angle and then decrease. We attribute this behavior to the interaction between Josephson and pancake vortices.
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