Superconductor-Insulator Transition in a Two-Dimensional Array of Resistively Shunted Small Josephson Junctions

作     者：Yamaguchi Takahide Ryuta Yagi Akinobu Kanda Youiti Ootuka Shun-ichi Kobayashi 

作者机构：Institute of Physics University of Tsukuba 1-1-1 Tennodai Tsukuba 305-8571 Japan CREST Japan Science and Technology Corporation 4-1-8 Honcho Kawaguchi 332-0012 Japan The Institute of Physical and Chemical Research (RIKEN) 2-1 Hirosawa Wako 351-0198 Japan 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2000年第85卷第9期

页      面：1974-1974页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Josephson junction devices 

摘      要：We have fabricated two-dimensional (2D) small-Josephson-junction arrays of which each Al−AlOx−Al junction is shunted by a Cr resistor. The arrays with large junction resistance and large charging energy show a transition from insulating to superconducting behavior when the shunt resistance is lowered below a critical value, which is close to 2RQ ( RQ≡h/4e2=6.45kΩ). The measured phase diagram is consistent with theories of quantum-fluctuation-driven and dissipation-driven phase transitions in the 2D Josephson-junction array with Ohmic shunt resistors.