Probing the intrinsic Josephson coupling potential in Bi2Sr2CaCu2O8+delta superconductors by thermal activation
Probing the intrinsic Josephson coupling potential in Bi2Sr2CaCu2O8+delta superconductors by thermal activation
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通过热激活探测 Bi2Sr2CaCu2O8 δ 超导体的固有约瑟夫森耦合势
DOI：
10.1103/physrevb.72.012512
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发表时间：
2005
影响因子：
3.7
通讯作者：
P. Delsing
中科院分区：
文献类型：
--
作者：
V. Krasnov;T. Bauch;P. Delsing
我们研究小型 Bi-2212 本征约瑟夫森结中的热波动现象。由于能够测量单个本征结的开关电流，我们观察到它的统计数据可以通过具有正弦电流相位关系的周期性约瑟夫森电势的热激活来很好地描述。这是直流本征约瑟夫森效应的直接证据，也是强各向异性高温超导体层间传输隧道性质的首次明确证实。此外，从开关电流统计分析中提取的无波动临界电流表现出超导体-绝缘体-超导体隧道结典型的温度依赖性。
We study thermal fluctuation phenomena in small Bi-2212 intrinsic Josephson junctions. Being able to measure switching currents of a {\it single} intrinsic junction, we observe that it's statistics can be very well described by thermal activation from a periodic Josephson potential with the sinusoidal current-phase relation. This is a direct evidence for the dc-intrinsic Josephson effect and the first unambiguous confirmation of the tunnelling nature of interlayer transport in strongly anisotropic high temperature superconductors. Furthermore, the fluctuation-free critical current, extracted from the analysis of switching current statistics, exhibits a temperature dependence typical for superconductor- insulator- superconductor tunnel junctions.