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Transport properties of Tl2Ba2CaCu2O8 microbridges on a low-angle step substrate |
| Sheng-Hui Zhao(赵生辉)1, Wang-Hao Tian(田王昊)2, Xue-Lian Liang(梁雪连)1, Ze He(何泽)1, Pei Wang(王培)3, Lu Ji(季鲁)1,4,†, Ming He(何明)1, and Hua-Bing Wang(王华兵)2,‡ |
1 College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China;
2 Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China;
3 Beijing Institute of Radio Measurement, Beijing 100854, China;
4 Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Tianjin 300350, China |
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Abstract Tl-based superconducting devices have been drawn much attention for their high transition temperature (Tc), which allow the high temperature superconductors (HTS) devices to operate at temperature near 100 K. The realization of Tl-based devices will promote the research and application of HTS devices. In this work, we present transport properties of Tl2Ba2CaCu2O8 (Tl-2212) microbridges across a low-angle step on LaAlO3 (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.
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Received: 27 January 2021
Revised: 25 February 2021
Accepted manuscript online: 05 March 2021
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PACS:
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03.75.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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74.25.F-
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(Transport properties)
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Corresponding Authors:
Lu Ji, Hua-Bing Wang
E-mail: luji@nankai.edu.cn;hbwang@nju.edu.cn
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Cite this article:
Sheng-Hui Zhao(赵生辉), Wang-Hao Tian(田王昊), Xue-Lian Liang(梁雪连), Ze He(何泽), Pei Wang(王培), Lu Ji(季鲁), Ming He(何明), and Hua-Bing Wang(王华兵) Transport properties of Tl2Ba2CaCu2O8 microbridges on a low-angle step substrate 2021 Chin. Phys. B 30 060308
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