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

doi:10.1088/1674-1056/ac89e1

中国物理B ›› 2023, Vol. 32 ›› Issue (3): 37402-037402.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

收稿日期:2022-04-22 修回日期:2022-07-20 接受日期:2022-08-16 出版日期:2023-02-14 发布日期:2023-02-21
通讯作者: Jun-Yi Ge E-mail:junyi_ge@t.shu.edu.cn
基金资助:
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.

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

Received:2022-04-22 Revised:2022-07-20 Accepted:2022-08-16 Online:2023-02-14 Published:2023-02-21
Contact: Jun-Yi Ge E-mail:junyi_ge@t.shu.edu.cn
Supported by:
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.

摘要/Abstract

摘要： 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.

关键词: multilayer superconducting film, competing interaction, flux pinning mechanism

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.

Key words: multilayer superconducting film, competing interaction, flux pinning mechanism

中图分类号: (Magnetic properties including vortex structures and related phenomena)

74.25.Ha

74.25.Dw (Superconductivity phase diagrams) 74.25.Bt (Thermodynamic properties) 74.25.Op (Mixed states, critical fields, and surface sheaths)

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[J]. 中国物理B, 2023, 32(3): 37402-037402.

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

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

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