Abstract
We investigated the switching current distribution, P( I), from the zero-voltage state to a nonzero-voltage state in the intrinsic Josephson junctions of Bi 2Sr 2CaCu 2O y . Because of a reduction of the Josephson penetration depth attributed to an atomic-scale thickness of the superconducting layers, a depinning process of Josephson vortices was found to dominate the behavior of P( I) for the mesas with a lateral size larger than ∼10 μm.
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