摘要
A simple technique is reported for fabricating the mesa structure on Bi2Sr2CaCu2O8+δ single crystal. In the patterning process, metal masks are used instead of photolithography and argon ion milling is applied to form the small mesa on the Bi2Sr2CaCu2O8+δ crystal surface. Real four-probe transport measurements are made on the mesa structure and typical c-axis current-voltage (I - V) characteristics of the intrinsic Josephson effect have been observed. The superconducting gap parameter can be extracted from the multi-branch structure in the I - V characteristics. Additionally, from the strong hysteresis in the I - V characteristics, the capacitance CJ of the unit intrinsic Josephson junction has been estimated to be 2.3pF, which is in good agreement with that evaluated from the geometric parameters of the unit junction between the two copper oxide layers.
作者
冯一军
单文磊
尤立星
周赣东
吉争鸣
康琳
许伟伟
杨森祖
吴培亨
张裕恒
FENG Yi-jun;SHAN Wen-lei;YOU Li-Xing;ZHOU Gan-dong;JI Zheng-ming;KANG Lin;XU Wei-wei;YANG Sen-zu;WU Pei-heng;ZHANG Yu-heng(Department of Electronic Science and Engineering,Nanjing University,Nanjing 210093;Structure Research Laboratory,University of Science and Technology of China,Hefei 230026)
基金
the National Center for Research and Development on Superconductivity of China
in part by the International Collaborative Research Project of Telecommunications Advancement Organization of Japan.