摘要
Tl-based superconducting devices have been drawn much attention for their high transition temperature(T_c), which allow the high temperature superconductors(HTS) devices to operate at temperature near 100 K. The realization of Tlbased devices will promote the research and application of HTS devices. In this work, we present transport properties of Tl_(2) Ba_(2) CaCu_(2) O_(8)(Tl-2212) microbridges across a low-angle step on LaAlO_(3)(LAO) substrate. We experimentally demonstrate intrinsic Josephson effects(IJEs) in Tl-2212 films by tailoring the geometry, i.e., reducing the width of the microbridges. In the case of a 1 μm width microbridge, in addition to the observation of voltage branches and remarkable hysteresis on the current–voltage(I–V) characteristics, the temperature dependence of differential resistance shows a finite resistance above 60 K when the bias current is below the critical current. For comparison, the wider microbridges are also investigated, exhibiting a highly critical current but do not showing obvious IJEs.
作者
Sheng-Hui Zhao
Wang-Hao Tian
Xue-Lian Liang
Ze He
Pei Wang
Lu Ji
Ming He
Hua-Bing Wang
赵生辉;田王昊;梁雪连;何泽;王培;季鲁;何明;王华兵(College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China;Research Institute of Superconductor Electronics,Nanjing University,Nanjing 210093,China;Beijing Institute of Radio Measurement,Beijing 100854,China;Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin,Tianjin 300350,China)
