Abstract
Current–voltage ( I– V) measurements on mesa-structured Bi 2Sr 2CaCu 2O 8+ δ single crystals have been performed to study the interlayer coupling between Cu–O superconducting layers and vortex states in presence of the Josephson current and magnetic fields along the c-axis. At lower temperatures than 25 K, a pronounced effect of magnetic fields to the I– V characteristics appears in multiple-branching behaviour, when magnetic fields exceed the dimensional-crossover field B 2D. This is considered as a consequence of missing a long-range order of correlation of the vortex lines along the c-axis, reflecting the transition to vortex glass state from vortex lattice state. At higher temperatures, the effect is observed in an abrupt change of the Josephson critical current at magnetic fields lower than the B 2D and the melting field B m. This might be a possible evidence of the reduction in the magnetic fields of the peak effect and the melting transition in presence of the Josephson current.
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