Abstract
We have observed back-bending structures at high bias current in the current–voltagecurves of intrinsic Josephson junctions. These structures may be caused by nonequilibriumquasiparticle injection and/or Joule heating. The energy gap suppression variesconsiderably with temperature. Different levels of the suppression are observed when thesame level of current passes through top electrodes of different sizes. Another effect whichis seen and discussed is a super-current ‘re-entrance’ of a single intrinsic Josephson junctionwith high bias current.
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