Abstract
We have investigated the pronounced subgap structures in intrinsic Josephson junctions of (Bi 1− x Pb x ) 2Sr 2CaCu 2O y mesas with x≲0.2. The structures appear to be composed of multiple subbranches on quasiparticle branches in the current–voltage characteristics, independent of x, junction geometry, weak magnetic field and temperature T lower than the disappearance temperatures of subbranches T d. The excess current densities of the subbranches are approximately proportional to the critical current density of the intrinsic Josephson junctions at 4.2 K, and tend to increase, when T approaches T d. These features of the structures are discussed within the framework of the recently proposed coupling mechanisms between optical phonons and Josephson oscillations.
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