Abstract
In order to understand the intrinsic Josephson tunnelling properties, the current–voltage (I–V) characteristics of small-sized intrinsic Josephson junctions in (Bi1−xPbx)2Sr2CaCu2Oy (B(P)SCCO) single crystals with x = 0, 0.15 and 0.2 are investigated. By reducing the mesa size, reproducible I–V characteristics of intrinsic Josephson junctions were successfully measured. All fabricated mesas exhibit typical multiple branching in their I–V curves, which are independent of x. In addition, a well-defined gap structure without negative resistance is observed for the mesas that have dimensions less than a few μm2. The gap parameter Δ of these materials is ∼25 meV at 4.2 K. The critical current density Jc at 4.2 K depends on x. The quasiparticle characteristics and the temperature dependence of critical currents are discussed by the d-wave tunnelling model.
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