Abstract
The temperature evolution of current–voltage characteristics (CVCs) of break junctions made from polycrystalline Y 0.75Lu 0.25Ba 2Cu 3O 7 and La 1.85Sr 0.15CuO 4 is investigated. The experimental CVCs have hysteretic features that reflect a part of a curve with negative differential resistance. The temperature evolution of the CVCs is discussed within the framework of the Kümmel–Gunsenheimer–Nicolsky theory for superconductor/normal-metal/superconductor junctions considering multiple Andreev reflections. It is shown that the shape of the CVCs of break junctions is determined by the ratio of the number of “short” and “long” intergrain normal regions in the polycrystalline HTSC under investigation.
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