高温超导约瑟夫森结阵列的相位锁定  

The phase locking of high temperature superconductor Josephson junction arrays

作　　者：何明[1] 宋凤斌[1] 岳宏卫[1] 赵新杰[1] 左涛[1] 方兰[1] 阎少林[1] A.M.Klushin N.Klein 

机构地区：[1]南开大学电子科学系,天津300071 [2]Institute of Bio-and Nanosystems,Forschungszentrum Juelich GmbH,Germany

出　　处：《低温与超导》2008年第3期1-3,36,共4页Cryogenics and Superconductivity

基　　金：“教育部博士点基金”;国家科委“973”(2006CB601006)项目;“863”(2006AA03Z213)项目

摘　　要：根据交流约瑟夫森效应,研究了嵌入Fabry-Perot谐振腔里的约瑟夫森结阵列在微波辐照下的相位锁定问题。结阵列是由生长在双晶钇稳定氧化锆(YSZ)基片上的YB2Cu3O7(YBCO)超导薄膜光刻成微桥得到的。通过优化设计,在温度为79.2K辐照频率为77.465GHz的条件下,包含620个串联约瑟夫森双晶结的结阵列在外加微波辐照下实现了相位锁定,得到了陡峭的夏皮罗台阶。其第一级夏皮罗台阶的电压约为0.1V,台阶高度约为0.17mA。试验结果表明,这种结阵列结构在电压基准的应用上有极大的优势,而且这种准光学耦合方法在太赫兹信号发生和检测方面有很好的应用前景。According to the AC Josephson effect, we have studied the issue of the phase locking of Josephson junction arrays embedded in the Fabry- Perot resonator under the microwave radiation. The junction arrays are gained by optically eroding the superconductor film of YB2 Cu3 O7 （YBCO） which is grown on commercially fabricated symmetrical bicrystal yttria -stabilized zirconia （YSZ） substrates into micro - bridge. Through the optimizing design, under the condition that the temperature is 79.2K and the radiation frequency is 77. 465GHz, the phase locking of arrays including 620 serial bicrystal Josephson junctions under the external microwave radiation is realized and the steep Shapiro step is gained, in which the voltage of first Shapiro step is approximately 0. 1V and the height of the step is 0. 17mA. the experimental result shows that this sort of array structure of junctions has considerable advantage in the application of voltage criterion. Besides, this method of quasi - optical coupling has a promoting prospective in the generation and detection of THz signal.

关 键 词：高温超导 约瑟夫森效应 Fabry-Perot谐振腔 约瑟夫森结阵列 

分 类 号：TM26[一般工业技术—材料科学与工程] TP301.6[电气工程—电工理论与新技术]