Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films  

作　　者：张丽萍 徐祖雨 黎晓杰 张旭 秦明阳 张若舟 徐娟 程文欣 袁洁 王华兵 Alejandro V.Silhanek 朱北沂 苗君 金魁 Liping Zhang;Zuyu Xu;Xiaojie Li;Xu Zhang;Mingyang Qin;Ruozhou Zhang;Juan Xu;Wenxin Cheng;Jie Yuan;Huabing Wang;Alejandro V.Silhanek;Beiyi Zhu;Jun Miao;Kui Jin(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Research Institute of Superconductor Electronics,School of Electronic Science and Engineering,Nanjing University,Nanjing 210023,China;Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Vacuum Physics,School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 101408,China;Purple Mountain Laboratories,Nanjing 211111,China;Experimental Physics of Nanostructured Materials,Q-MAT,CESAM,Universit´e de Li`ege,B-4000 Sart Tilman,Belgium;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[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,Universit´e de Li`ege,B-4000 Sart Tilman,Belgium [9]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics B》2023年第4期613-621,共9页中国物理B（英文版）

基　　金：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;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.XDB25000000and XDB33000000);the Beijing Natural Science Foundation(Grant No.Z190008);the Key-Area Research and Development Program of Guangdong Province,China(Grant No.2020B0101340002);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 Al2O3substrates 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/Al2O3film.For the curved Nb/PI film,smooth superconducting transitions were obtained at low currents,while unexpected cascade structures were revealed in theρ(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 

分 类 号：TB383.2[一般工业技术—材料科学与工程]