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Chin. Phys. B, 2023, Vol. 32(3): 037402    DOI: 10.1088/1674-1056/ac89e1

Flux pinning evolution in multilayer Pb/Ge/Pb/Ge/Pb superconducting systems

Li-Xin Gao(高礼鑫)1, Xiao-Ke Zhang(张晓珂)1, An-Lei Zhang(张安蕾)1, Qi-Ling Xiao(肖祁陵)1, Fei Chen(陈飞)1, and Jun-Yi Ge(葛军饴)1,2,3,†
1 Materials Genome Institute, Shanghai University, Shanghai 200444, China;
2 Shanghai Key Laboratory for High Temperature Superconductors, Shanghai University, Shanghai 200444, China;
3 Zhejiang Laboratory, Hangzhou 311100, China
Abstract  Multicomponent superconductors exhibit nontrivial vortex behaviors due to the various vortex-vortex interactions, including the competing one in the recently proposed type-1.5 superconductor. However, potential candidate that can be used to study the multicomponent superconductivity is rare. Here, we prepared an artificial superconducting multilayer to act as an alternative approach to study multicomponent superconductivity. The additional repulsive length and the coupling strength among superconducting films were regulated by changing the thickness of the insulting layer. The magnetization measurements were performed to clarify the effect of the competition between the repulsive vortex interactions on the macroscopic superconductivity. The vortex phase diagram and the optimum critical current density have been determined. Furthermore, a second magnetization effect is observed, and is attributed to the upper layer, which provides the weak pinning sites to localize the flux lines. The pinning behaviors switches to the mixed type with the increase of the insulting layer thicknesses. Our results open a new perspective to the study and related applications of the multilayer superconducting systems.
Keywords:  multilayer superconducting film      competing interaction      flux pinning mechanism  
Received:  22 April 2022      Revised:  20 July 2022      Accepted manuscript online:  16 August 2022
PACS:  74.25.Ha (Magnetic properties including vortex structures and related phenomena)  
  74.25.Dw (Superconductivity phase diagrams)  
  74.25.Bt (Thermodynamic properties)  
  74.25.Op (Mixed states, critical fields, and surface sheaths)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12174242), the National Key Research and Development Program of China (Grant No. 2018YFA0704300), the Key Research Project of Zhejiang Laboratory (Grant No. 2021PE0AC02). Jun-Yi Ge also thanks the support by the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning.
Corresponding Authors:  Jun-Yi Ge     E-mail:

Cite this article: 

Li-Xin Gao(高礼鑫), Xiao-Ke Zhang(张晓珂), An-Lei Zhang(张安蕾), Qi-Ling Xiao(肖祁陵), Fei Chen(陈飞), and Jun-Yi Ge(葛军饴) Flux pinning evolution in multilayer Pb/Ge/Pb/Ge/Pb superconducting systems 2023 Chin. Phys. B 32 037402

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