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YBa2Cu3O(7-delta) 0-pi 约瑟夫森结中半通量子静态和动态特性的相互作用。

Interplay between static and dynamic properties of semifluxons in YBa2Cu3O(7-delta) 0-pi Josephson junctions.

机构信息

Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.

出版信息

Phys Rev Lett. 2010 Apr 30;104(17):177003. doi: 10.1103/PhysRevLett.104.177003. Epub 2010 Apr 28.

DOI:10.1103/PhysRevLett.104.177003
PMID:20482129
Abstract

We have investigated the static and dynamic properties of long YBa2Cu3O(7-delta) 0-pi Josephson junctions and compared them with those of conventional 0 junctions. Scanning SQUID microscope imaging has revealed the presence of a semifluxon at the phase discontinuity point in 0-pi Josephson junctions. Zero field steps have been detected in the current-voltage characteristics of all junctions. Comparison with simulation allows us to attribute these steps to fluxons traveling in the junction for conventional 0 junctions and to fluxon-semifluxon interactions in the case of 0-pi Josephson junctions.

摘要

我们研究了长 YBa2Cu3O(7-delta) 0-pi 约瑟夫森结的静态和动态特性，并将其与传统的 0 结进行了比较。扫描 SQUID 显微镜成像揭示了 0-pi 约瑟夫森结在相位不连续点存在半磁通量子。在所有结的电流-电压特性中都检测到零场阶跃。与模拟的比较使我们能够将这些阶跃归因于传统 0 结中在结中传播的磁通量子，以及 0-pi 约瑟夫森结中磁通量子-半磁通量子相互作用。

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