中国物理B ›› 2009, Vol. 18 ›› Issue (10): 4486-4489.doi: 10.1088/1674-1056/18/10/064

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Matching effect in superconducting NbN thin film with a square lattice of holes

Muhammad Kamran1, 何世坤1, 张伟君1, 曹文会1, 李博宏1, 邱祥冈1, 康琳2, 陈健2, 吴培亨2   

  1. (1)Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory of Condensed Matter Physics, Beijing 100190, China; (2)Research Institute of Superconducting Electronics, Department of Electronic Science & Engineering, Nanjing University, Nanjing 210093, China
  • 收稿日期:2009-04-17 修回日期:2009-05-11 出版日期:2009-10-20 发布日期:2009-10-20
  • 基金资助:
    Project supported by the Comsats Institute of Information Technology, Islamabad, Pakistan，the National Natural Science Foundation of China (Grant No 10674168), and the State Key Program for Basic Research of China (Grant No 2006CB601006).

Matching effect in superconducting NbN thin film with a square lattice of holes

Muhammad Kamrana), He Shi-Kun(何世坤)a), Zhang Wei-Jun(张伟君)a), Cao Wen-Hui(曹文会)a), Li Bo-Hong(李博宏)a), Kang Lin(康琳)b), Chen Jian(陈健)b), Wu Pei-Heng(吴培亨)b), and Qiu Xiang-Gang(邱祥冈)a)†   

  1. a Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory of Condensed Matter Physics, Beijing 100190, China; b Research Institute of Superconducting Electronics, Department of Electronic Science & Engineering, Nanjing University, Nanjing 210093, China
  • Received:2009-04-17 Revised:2009-05-11 Online:2009-10-20 Published:2009-10-20
  • Supported by:
    Project supported by the Comsats Institute of Information Technology, Islamabad, Pakistan，the National Natural Science Foundation of China (Grant No 10674168), and the State Key Program for Basic Research of China (Grant No 2006CB601006).

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摘要： A square hole array is fabricated over a micro-bridge of NbN thin film by electron beam lithography and reactive ion milling. Magneto-resistance is measured across the micro-bridge filled with a hole array near the superconducting transition temperature. It is found that magneto-resistance minima occur when the number of vortices is an integer multiple or a fractional multiple of the number of holes. The temperature and the current dependences of the matching effect are studied.

Abstract: A square hole array is fabricated over a micro-bridge of NbN thin film by electron beam lithography and reactive ion milling. Magneto-resistance is measured across the micro-bridge filled with a hole array near the superconducting transition temperature. It is found that magneto-resistance minima occur when the number of vortices is an integer multiple or a fractional multiple of the number of holes. The temperature and the current dependences of the matching effect are studied.

Key words: flux pinning, superconducting thin film, matching effect

中图分类号: 

  • 74.25.Fy
74.25.Ha (Magnetic properties including vortex structures and related phenomena) 74.25.Sv (Critical currents) 81.20.Wk (Machining, milling) 85.25.-j (Superconducting devices)