Abstract
In order to understand the detailed characteristics of YBa2Cu3O7−X (YBCO) intrinsic Josephson junctions (IJJs) without shunted grain boundary or non-uniformity, junction area should be reduced to sub-micron region. Hence, we fabricated small-sized IJJs on an YBCO whisker with high-quality crystalline, and investigated their transport properties. The small-sized IJJs, with junction areas of 0.12–0.36μm2, were fabricated by 3D focused ion-beam etching method. We measured current–voltage curves, and showed clear multiple branches with hysteresis structure, such as IJJs in Bi2Sr2CaCu2O8+X. Also, from the temperature dependence of critical current, it is found that the junction behavior drastically changes from that of SNS-type to SIS-type when the anisotropy is increased. The critical current densities of junctions were 10–100kA/cm2 orders, and they strongly depend on the critical temperature.
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