Direct observation of condensate and vortex confinement in nanostructured superconductors
Direct observation of condensate and vortex confinement in nanostructured superconductors
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DOI：
10.1103/physrevb.93.054514
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发表时间：
2016-02
影响因子：
3.7
通讯作者：
M. Timmermans;L. Serrier-Garcia;M. Perini;J. Vondel;V. Moshchalkov
中科院分区：
文献类型：
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作者：
M. Timmermans;L. Serrier-Garcia;M. Perini;J. Vondel;V. Moshchalkov
在这项工作中，我们报告了扫描隧道显微镜对光刻定义的超导纳米方的研究。得到的光谱图揭示了超导凝聚体和屏蔽电流随外加磁场的空间演化。纳米结构的对称性被施加到凝聚体上，它控制着纳米方阵内涡流的分布。我们的局部研究允许探索这些结构中无处不在的小结构缺陷对超流和涡旋分布的影响。从而获得了纳米尺度下涡旋钉住和电流拥挤的直接实验证据。
In this work we report a scanning tunneling microscopy investigation of lithographically defined superconducting nanosquares. The obtained spectroscopic maps reveal the spatial evolution of both the superconducting condensate and the screening currents as a function of the applied magnetic field. The symmetry of the nanostructure is imposed on the condensate and it controls the distribution of the vortices inside the nanosquare. Our local study allows exploring the impact of small structural defects, omnipresent in these kind of structures, on both the supercurrent and vortex distribution. As a result, direct experimental evidence of vortex pinning and current crowding at the nanoscale has been obtained.