中国物理B ›› 2023, Vol. 32 ›› Issue (4): 47302-047302.doi: 10.1088/1674-1056/acac16
Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films
Liping Zhang(张丽萍)1,2,†, Zuyu Xu(徐祖雨)3, Xiaojie Li(黎晓杰)3, Xu Zhang(张旭)2, Mingyang Qin(秦明阳)2,4, Ruozhou Zhang(张若舟)2,5, Juan Xu(徐娟)2, Wenxin Cheng(程文欣)2,5, Jie Yuan(袁洁)2,6, Huabing Wang(王华兵)3,7, Alejandro V. Silhanek8, Beiyi Zhu(朱北沂)2, Jun Miao(苗君)1, and Kui Jin(金魁)2,5,9
- 1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China;
4 Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
5 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
6 Key Laboratory of Vacuum Physics, School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, China;
7 Purple Mountain Laboratories, Nanjing 211111, China;
8 Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège, B-4000 Sart Tilman, Belgium;
9 Songshan Lake Materials Laboratory, Dongguan 523808, China
Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films
Liping Zhang(张丽萍)1,2,†, Zuyu Xu(徐祖雨)3, Xiaojie Li(黎晓杰)3, Xu Zhang(张旭)2, Mingyang Qin(秦明阳)2,4, Ruozhou Zhang(张若舟)2,5, Juan Xu(徐娟)2, Wenxin Cheng(程文欣)2,5, Jie Yuan(袁洁)2,6, Huabing Wang(王华兵)3,7, Alejandro V. Silhanek8, Beiyi Zhu(朱北沂)2, Jun Miao(苗君)1, and Kui Jin(金魁)2,5,9
- 1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China;
4 Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
5 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
6 Key Laboratory of Vacuum Physics, School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, China;
7 Purple Mountain Laboratories, Nanjing 211111, China;
8 Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège, B-4000 Sart Tilman, Belgium;
9 Songshan Lake Materials Laboratory, Dongguan 523808, China
摘要： High quality Nb films were successfully prepared on both flexible polyimide (PI) and rigid Al2O3 substrates and their transport properties were systematically studied at various applied currents, external magnetic fields, and sample orientations. It is found that a curved Nb/PI film exhibits quite different superconducting transition and vortex dynamics compared to the flat Nb/Al2O3 film. For the curved Nb/PI film, smooth superconducting transitions were obtained at low currents, while unexpected cascade structures were revealed in the ρ(T) curves at high currents. We attribute this phenomenon to the gradient distribution of vortex density together with a variation of superconductivity along the curved film. In addition, reentrant superconductivity was induced in the curved Nb/PI thin film by properly choosing the measurement conditions. We attribute this effect to the vortex pinning from both in-plane vortices and out-of-plane vortices. This work reveals the complex transport properties of curved superconducting thin films, providing important insights for further theoretical investigations and practical developments of flexible superconductors.
中图分类号: (Electrical properties of specific thin films)
- 73.61.-r