Abstract
We present a study of the switching current distribution from the zero-voltage state to a nonzero-voltagestate in Bi2Sr2CaCu2Oy intrinsic Josephson junctions. Because of a large reduction of the Josephson penetrationdepth attributed to an atomic-scale thickness of the superconducting layers, a thermallyactivated depinning of Josephson vortices was found to dominate the behaviour ofthe switching current distribution for mesas with lateral dimensions between10 × 10 and 40 × 40 µm2. With decreasing lateral dimensions of the mesa, the measured switching currentdistribution was found to become much narrower than that in the thermally activatedescape model. We argue that this behaviour is attributed to an increase in the retrappingevents after an escape event.
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