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arXiv 0806.4839cond-mat.supr-concond-mat.str-el
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超导量子干涉滤波器的一种新工作方式

Novel Regime of Operation for Superconducting Quantum Interference Filters

A. V. Shadrin, K. Y. Constantinian, G. A. Ovsyannikov, S. V. Shitov, I. I. Soloviev, V. K. Kornev, J. Mygind

摘要:

研究了超导量子干涉滤波器(SQIF)的一种新工作模式。电压-磁场响应函数V(H)由约瑟夫森结(F模式)中的临界电流和磁通量聚焦效应的夫琅和费依赖性确定。对于由高温超导双晶约瑟夫森结构成的SQIF阵列,F模在电压场响应V(H)中起主导作用。SQIF的相对较大的超导回路用于电感耦合到外部输入电路。结果表明,在1 - 2 GHz范围内,用冷却放大器测量的SQIF阵列的输出噪声由V(H)特性的斜率决定。使用低频SQIF参数评估功率增益和饱和功率。最后,我们考虑了SQIF阵列中约瑟夫森结的参数分布对整个结构的V(H)特性的影响。

英文摘要:

A new operating regime of the Superconducting Quantum Interference Filter (SQIF) is investigated. The voltage to magnetic field response function, V(H), is determined by a Fraunhofer dependence of the critical current and magnetic flux focusing effect in Josephson junctions (F-mode). For SQIF-arrays made of high-Tc superconducting bicrystal Josephson junctions the F-mode plays a predominant role in the voltage-field response V(H). The relatively large superconducting loops of the SQIF are used for inductive coupling to the external input circuit. It is shown that the output noise of a SQIF-array measured with a cooled amplifier in the 1-2 GHz range is determined by the slope of the V(H) characteristic. Power gain and saturation power were evaluated using low frequency SQIF parameters. Finally, we consider the influence of the spread in the parameters of Josephson junctions in the SQIF-array on the V(H) characteristic of the whole structure.

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