Nonideal artificial phase discontinuity in long Josephson 0-κ junctions -: art. no. 054522
Nonideal artificial phase discontinuity in long Josephson 0-κ junctions -: art. no. 054522
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DOI：
10.1103/physrevb.72.054522
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发表时间：
2005-08-01
影响因子：
3.7
通讯作者：
Neuhaus, M
中科院分区：
文献类型：
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作者：
Gaber, T;Goldobin, E;Neuhaus, M
我们研究了在Nb-AlOx-Nb约瑟夫森长结(LJJ)中利用一对微电流注入器产生的约瑟夫森相的任意卡帕不连续，并研究了在此不连续处形成的分数涡的形成。电流i-inj从一个喷射器流向另一个喷射器，产生与i-inj成比例的相间断卡帕。对喷油器的标定进行了详细的讨论。喷射器的小而有限的尺寸导致这种0-kappa LJJ的性质与具有理想kappa不连续的LJJ的性质有一些偏差。在有限注入器尺寸的情况下，通过数值模拟可以很好地再现这些实验观察到的临界电流与i-inj和磁场的关系的偏差。讨论了这些偏差的物理根源。
We investigate the creation of an arbitrary kappa discontinuity of the Josephson phase in a long Nb-AlOx-Nb Josephson junction (LJJ) using a pair of tiny current injectors, and study the formation of fractional vortices formed at this discontinuity. The current I-inj, flowing from one injector to the other, creates a phase discontinuity kappa proportional to I-inj. The calibration of injectors is discussed in detail. The small but finite size of injectors leads to some deviations of the properties of such a 0-kappa LJJ from the properties of a LJJ with an ideal kappa discontinuity. These experimentally observed deviations in the dependence of the critical current on I-inj and magnetic field can be well reproduced by numerical simulation assuming a finite injector size. The physical origin of these deviations is discussed.