Current - voltage characteristics of break junctions of high-Tc superconductors
Gokhfeld, D M · Balaev, D A · Shaykhutdinov, K A · Popkov, S I · Petrov, M I
Original · EN
The current-voltage (I-V) characteristics of break junctions of polycrystalline La₁.₈₅Sr₀.₁₅CuO₄, Y₀.₇₅Lu₀.₂₅Ba₂Cu₃O₇₋δ, Bi₁.₈Pb₀.₃Sr₁.₉Ca₂Cu₃Oₓ and composite YBa₂Cu₃O₇₋δ + Ag are investigated. The experimental I-V curves exhibit the specific peculiarities of superconductor/normal-metal/superconductor junctions. The relation between an I-V characteristic of network of weak links and I-V dependencies of typical weak links is suggested to describe the experimental data. The I-V curves of typical weak links are calculated by the Kümmel - Gunsenheimer - Nicolsky model considering the multiple Andreev reflections.
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