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
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
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.
Received: 16 July 2003
Revised: 29 October 2003
Accepted manuscript online:
PACS:
74.25.Ha
(Magnetic properties including vortex structures and related phenomena)
Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No G1999064609).
Cite this article:
Li Zhuang-Zhi (李壮志), Wang Fu-Ren (王福仁), Yang Tao (杨涛), Liu Xin-Yuan (刘新元), Ma Ping (马平), Xie Fei-Xiang (谢飞翔), Nie Rui-Juan (聂瑞娟), Dai Yuan-Dong (戴远东) Investigation of spontaneous magnetization of coupled 2×2 superconducting $\pi$ ring array 2004 Chinese Physics 13 532
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