【摘 要】
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Mesa-structured intrinsic Josephson junctions are fabricated in Bi2Sr2CaCu2O8+x single crystals. Typical current-voltage characteristics of intrinsic Josephson
【机 构】
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Department of Electronic Science and Engineering,Research Institute of Electrical Communication
论文部分内容阅读
Mesa-structured intrinsic Josephson junctions are fabricated in Bi2Sr2CaCu2O8+x single crystals. Typical current-voltage characteristics of intrinsic Josephson junc- tions are observed, which include multiple quasi-particle branches, surface junction with critical current lower than those of inner junctions, and subgap structures on quasi- particle branches. The corresponding physical explanations are also given. The energy gap voltage of the intrinsic Josephson junctions at 30 K is about 20 mV. Besides, the measured Ic-T relationship agrees quite well with the theoretical computations based on supercon- ductor. Our measured dI/dV?V relationship shows the V-shaped gap structure, obviously differing from the U-shaped gap structure of the s-wave superconductor.
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