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)†
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
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.
Received: 17 April 2009
Revised: 11 May 2009
Accepted manuscript online:
Fund: 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).
Cite this article:
Muhammad Kamran, He Shi-Kun(何世坤), Zhang Wei-Jun(张伟君), Cao Wen-Hui(曹文会), Li Bo-Hong(李博宏), Kang Lin(康琳), Chen Jian(陈健), Wu Pei-Heng(吴培亨), and Qiu Xiang-Gang(邱祥冈) Matching effect in superconducting NbN thin film with a square lattice of holes 2009 Chin. Phys. B 18 4486
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