Abstract We have studied the basic characteristics of a radio frequency superconducting quantum interference device (rf SQUID) involving two Josephson junctions connected in series, the case for the widely used grain boundary junction (GBJ) rf SQUID. It is found that the SQUID properties are determined mainly by the weaker junction when the critical current of the weaker junction is much lower than that of the other junction. Otherwise, the effect of the other junction is not negligible. We also find that only when the hysteresis parameter $\beta$ is less than $1-\alpha$, where $\alpha$ is the critical current ratio of the two junctions, will the SQUID operate in the nonhysteretic mode.
Received: 31 January 2004
Revised: 27 February 2004
Accepted manuscript online:
Fund: Project supported by the National Hi-Tech Development Programme of China (Grant No 2002AA306412) and the State Key Development Programme for Basic Research of China (Grant No G1999064609).
Cite this article:
Mao Bo (毛博), Tan Zhong-Kui (谭忠魁), Meng Shu-Chao (孟树超), Dai Yuan-Dong (戴远东), Wang Fu-Ren (王福仁) Basic properties of an rf SQUID involving two Josephson junctions connected in series 2004 Chinese Physics 13 1226
Development of 1.3GHz high-T-c rf SQUID Liu Xin-Yuan (刘新元), Xie Fei-Xiang (谢飞翔), Meng Shu-Chao (孟树超), Dai Yuan-Dong (戴远东), Li Zhuang-Zhi (李壮志), Ma Ping (马平), Yang Tao (杨涛), Nie Rui-Juan (聂瑞娟), Wang Fu-Ren (王福仁), . Chin. Phys. B, 2004, 13(1): 100-104.
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