中国物理B ›› 2023, Vol. 32 ›› Issue (4): 47302-047302.doi: 10.1088/1674-1056/acac16

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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. 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
  • 收稿日期:2022-10-21 修回日期:2022-12-02 接受日期:2022-12-16 出版日期:2023-03-10 发布日期:2023-03-14
  • 通讯作者: Liping Zhang E-mail:lipingzhang@iphy.ac.cn
  • 基金资助:
    Project supported by the National Key Basic Research Program of China (Grant Nos. 2021YFA0718700, 2018YFB0704102, 2017YFA0303003, 2017YFA0302902, 2016YFA0300301, and 2021YFA0718802), the National Natural Science Foundation of China (Grant Nos. 11927808, 11834016, 118115301, 119611410, 11961141008, 61727805, and 11961141002), the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) (Grant Nos. QYZDB-SSW-SLH008 and QYZDY-SSW-SLH001), CAS Interdisciplinary Innovation Team, the Strategic Priority Research Program (B) of CAS (Grant Nos. XDB25000000 and XDB33000000), the Beijing Natural Science Foundation (Grant No. Z190008), and the Key-Area Research and Development Program of Guangdong Province, China (Grant No. 2020B0101340002). M.Q. thanks the support from the China Postdoctoral Science Foundation (Grant No. 2022M711497).

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. 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
  • Received:2022-10-21 Revised:2022-12-02 Accepted:2022-12-16 Online:2023-03-10 Published:2023-03-14
  • Contact: Liping Zhang E-mail:lipingzhang@iphy.ac.cn
  • Supported by:
    Project supported by the National Key Basic Research Program of China (Grant Nos. 2021YFA0718700, 2018YFB0704102, 2017YFA0303003, 2017YFA0302902, 2016YFA0300301, and 2021YFA0718802), the National Natural Science Foundation of China (Grant Nos. 11927808, 11834016, 118115301, 119611410, 11961141008, 61727805, and 11961141002), the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) (Grant Nos. QYZDB-SSW-SLH008 and QYZDY-SSW-SLH001), CAS Interdisciplinary Innovation Team, the Strategic Priority Research Program (B) of CAS (Grant Nos. XDB25000000 and XDB33000000), the Beijing Natural Science Foundation (Grant No. Z190008), and the Key-Area Research and Development Program of Guangdong Province, China (Grant No. 2020B0101340002). M.Q. thanks the support from the China Postdoctoral Science Foundation (Grant No. 2022M711497).

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.

关键词: vortex dynamics, flexible superconducting films, transport properties, superconducting films

Abstract: 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.

Key words: vortex dynamics, flexible superconducting films, transport properties, superconducting films

中图分类号:  (Electrical properties of specific thin films)

  • 73.61.-r
74.25.Wx (Vortex pinning (includes mechanisms and flux creep)) 74.78.-w (Superconducting films and low-dimensional structures)