中国物理B ›› 2004, Vol. 13 ›› Issue (4): 532-537.doi: 10.1088/1009-1963/13/4/021

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Investigation of spontaneous magnetization of coupled 2×2 superconducting π ring array

李壮志1, 王福仁1, 杨涛1, 马平1, 谢飞翔1, 聂瑞娟1, 戴远东1, 刘新元2   

  1. (1)Mesoscopic Physics National Laboratory and Department of Physics, Peking University, Beijing 100871, China; (2)School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
  • 收稿日期:2003-07-16 修回日期:2003-10-29 出版日期:2004-04-22 发布日期:2004-04-20
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (Grant No G1999064609).

Investigation of spontaneous magnetization of coupled 2×2 superconducting $\pi$ ring array

Li Zhuang-Zhi (李壮志)a, Wang Fu-Ren (王福仁)a, Yang Tao (杨涛)a, Liu Xin-Yuan (刘新元)b, Ma Ping (马平)a, Xie Fei-Xiang (谢飞翔)a, Nie Rui-Juan (聂瑞娟)a, Dai Yuan-Dong (戴远东)a   

  1. a Mesoscopic Physics National Laboratory and Department of Physics, Peking University, Beijing 100871, China; b School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
  • Received:2003-07-16 Revised:2003-10-29 Online:2004-04-22 Published:2004-04-20
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (Grant No G1999064609).

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摘要： We present the theoretical investigation of spontaneous magnetization of a coupled 2×2 πring array. It is indicated by free energy calculation that the system has the lowest energy when the four π rings have the full antiparallel configuration. Furthermore, the numerical evaluation results show that the system which favours full antiparallel spontaneous magnetization is a quantum effect deriving from the phase cohering of the superconducting quantum wavefunctions in the four superconducting rings through the shared Josephson junctions.

关键词: π ring array, Josephson junction, spontaneous magnetization

Abstract: We present the theoretical investigation of spontaneous magnetization of a coupled 2×2 $\pi$ ring array. It is indicated by free energy calculation that the system has the lowest energy when the four $\pi$  rings have the full antiparallel configuration. Furthermore, the numerical evaluation results show that the system which favours full antiparallel spontaneous magnetization is a quantum effect deriving from the phase cohering of the superconducting quantum wavefunctions in the four superconducting rings through the shared Josephson junctions.

Key words: $\pi$  ring array, Josephson junction, spontaneous magnetization

中图分类号:  (Magnetic properties including vortex structures and related phenomena)

  • 74.25.Ha
74.50.+r (Tunneling phenomena; Josephson effects) 74.81.Fa (Josephson junction arrays and wire networks)