中国物理B ›› 2018, Vol. 27 ›› Issue (5): 57402-057402.doi: 10.1088/1674-1056/27/5/057402

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Vortex pinning and rectification effect in a nanostructured superconducting film with a square array of antidot triplets

An He(何安), Cun Xue(薛存), Youhe Zhou(周又和)   

  1. 1 College of Science, Chang'an University, Xi'an 710064, China;
    2 School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;
    3 Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, and Department of Mechanics and Engineering Sciences, Lanzhou University, Lanzhou 730000, China;
    4 School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2017-12-05 修回日期:2018-03-05 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: Cun Xue E-mail:xuecun@nwpu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11702034,11702218,and 11421062),Fundamental Research Funds for the Central Universities,China (Grant Nos.310812171011 and G2016KY0305),and the National Key Project of Magneto-Constrained Fusion Energy Development Program,China (Grant No.2013GB110002).

Vortex pinning and rectification effect in a nanostructured superconducting film with a square array of antidot triplets

An He(何安)1, Cun Xue(薛存)2, Youhe Zhou(周又和)3,4   

  1. 1 College of Science, Chang'an University, Xi'an 710064, China;
    2 School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;
    3 Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, and Department of Mechanics and Engineering Sciences, Lanzhou University, Lanzhou 730000, China;
    4 School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2017-12-05 Revised:2018-03-05 Online:2018-05-05 Published:2018-05-05
  • Contact: Cun Xue E-mail:xuecun@nwpu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11702034,11702218,and 11421062),Fundamental Research Funds for the Central Universities,China (Grant Nos.310812171011 and G2016KY0305),and the National Key Project of Magneto-Constrained Fusion Energy Development Program,China (Grant No.2013GB110002).

摘要: We study the stability of vortices pinning and dynamics in a superconducting thin strip containing a square array of antidot triplets by using the nonlinear Ginzburg-Landau (GL) theory. Compared with the regular square array of circular holes, the vortices are no longer pinned inside the circular holes, but instead stabilized at the center of the antidot triplets depending on the geometry parameters. Moreover, the influences of the geometry parameters and the polarity of the applied current on the current-voltage (I-V) characteristics are also studied. The critical current for the sample turning into a normal state becomes smaller when the hole diameter D is smaller and the spacing B between the holes is larger. Due to the asymmetric pinning sites, our numerical simulations demonstrate that the positive and negative rectified voltages appear alternately in the resistive state of the sample under an ac current of square pulses.

关键词: matching effect, antidot triplets, current-voltage characteristic, critical current

Abstract: We study the stability of vortices pinning and dynamics in a superconducting thin strip containing a square array of antidot triplets by using the nonlinear Ginzburg-Landau (GL) theory. Compared with the regular square array of circular holes, the vortices are no longer pinned inside the circular holes, but instead stabilized at the center of the antidot triplets depending on the geometry parameters. Moreover, the influences of the geometry parameters and the polarity of the applied current on the current-voltage (I-V) characteristics are also studied. The critical current for the sample turning into a normal state becomes smaller when the hole diameter D is smaller and the spacing B between the holes is larger. Due to the asymmetric pinning sites, our numerical simulations demonstrate that the positive and negative rectified voltages appear alternately in the resistive state of the sample under an ac current of square pulses.

Key words: matching effect, antidot triplets, current-voltage characteristic, critical current

中图分类号:  (Mesoscopic and nanoscale systems)

  • 74.78.Na
74.25.Sv (Critical currents) 74.25.Wx (Vortex pinning (includes mechanisms and flux creep)) 74.25.N- (Response to electromagnetic fields)