Effects of irradiation on superconducting properties of small-grained MgB2 thin films

doi:10.1088/1674-1056/acf5d3

中国物理B ›› 2023, Vol. 32 ›› Issue (12): 127402-127402.doi: 10.1088/1674-1056/acf5d3

Effects of irradiation on superconducting properties of small-grained MgB₂ thin films

Li Liu(刘丽)^1,2,3,4, Jung Min Lee², Yoonseok Han², Jaegu Song², Chorong Kim⁵, Jaekwon Suk⁵, Won Nam Kang^2,†, Jie Liu(刘杰)^3,4,‡, Soon-Gil Jung^6,§, and Tuson Park^1,2,¶

1 Center for Quantum Materials and Superconductivity(CQMS), Sungkyunkwan University, Suwon 16419, Republic of Korea;
2 Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea;
3 Institute of Modern Physics, Chinese Academy of Sciences(CAS), Lanzhou 730000, China;
4 School of Nuclear Science and Technology, University of Chinese Academy of Sciences(UCAS), Beijing 100049, China;
5 Korea Multi-purpose Accelerator Complex, Korea Atomic Energy Research Institute, Gyeongju, Gyeongbuk 38180, Republic of Korea;
6 Department of Physics Education, Sunchon National University, Suncheon 57922, Republic of Korea

收稿日期:2023-06-20 修回日期:2023-08-21 接受日期:2023-09-01 出版日期:2023-11-14 发布日期:2023-11-27
通讯作者: Won Nam Kang, Jie Liu, Soon-Gil Jung, Tuson Park E-mail:wnkang@skku.edu;j.liu@impcas.ac.cn;sgjung@scnu.ac.kr;tp8701@skku.edu
基金资助:
We wish to acknowledge the support of the accelerator group and operators of KOMAC (KAERI (C. K., J. S.)). Project supported by the National Research Foundation (NRF) of Korea through a grant funded by the Korean Ministry of Science and ICT (Grant No.2021R1A2C2010925 (T. P., Y. H., J. S.)); the Basic Science Research Program through the NRF of Korea funded by the Ministry of Education (Grant Nos.NRF-2019R1F1A1055284 (J. M. L., W. N. K.) and NRF-2021R1I1A1A01043885 (S. G. J., Y. H.)), the National Natural Science Foundation of China (Grant Nos.12035019 (J. L.)). Moreover, L. L. would like to acknowledge the Chinese Scholarship Council (CSC) for fellowship support.

Effects of irradiation on superconducting properties of small-grained MgB₂ thin films

Li Liu(刘丽)^1,2,3,4, Jung Min Lee², Yoonseok Han², Jaegu Song², Chorong Kim⁵, Jaekwon Suk⁵, Won Nam Kang^2,†, Jie Liu(刘杰)^3,4,‡, Soon-Gil Jung^6,§, and Tuson Park^1,2,¶

1 Center for Quantum Materials and Superconductivity(CQMS), Sungkyunkwan University, Suwon 16419, Republic of Korea;
2 Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea;
3 Institute of Modern Physics, Chinese Academy of Sciences(CAS), Lanzhou 730000, China;
4 School of Nuclear Science and Technology, University of Chinese Academy of Sciences(UCAS), Beijing 100049, China;
5 Korea Multi-purpose Accelerator Complex, Korea Atomic Energy Research Institute, Gyeongju, Gyeongbuk 38180, Republic of Korea;
6 Department of Physics Education, Sunchon National University, Suncheon 57922, Republic of Korea

Received:2023-06-20 Revised:2023-08-21 Accepted:2023-09-01 Online:2023-11-14 Published:2023-11-27
Contact: Won Nam Kang, Jie Liu, Soon-Gil Jung, Tuson Park E-mail:wnkang@skku.edu;j.liu@impcas.ac.cn;sgjung@scnu.ac.kr;tp8701@skku.edu
Supported by:
We wish to acknowledge the support of the accelerator group and operators of KOMAC (KAERI (C. K., J. S.)). Project supported by the National Research Foundation (NRF) of Korea through a grant funded by the Korean Ministry of Science and ICT (Grant No.2021R1A2C2010925 (T. P., Y. H., J. S.)); the Basic Science Research Program through the NRF of Korea funded by the Ministry of Education (Grant Nos.NRF-2019R1F1A1055284 (J. M. L., W. N. K.) and NRF-2021R1I1A1A01043885 (S. G. J., Y. H.)), the National Natural Science Foundation of China (Grant Nos.12035019 (J. L.)). Moreover, L. L. would like to acknowledge the Chinese Scholarship Council (CSC) for fellowship support.

摘要/Abstract

摘要： We investigate the effect of ion irradiation on MgB₂ thin films with small grains of approximately 122 nm and 140 nm. The flux pinning by grain boundaries is insignificant in the pristine MgB₂ films due to good inter-grain connectivity, but is significantly improved after 120-keV Mn-ion irradiation. The scaling behavior of the flux pinning force density for the ion-irradiated MgB₂ thin films with nanoscale grains demonstrates the predominance of pinning by grain boundaries, in contrast to the single-crystalline MgB₂ films where normal point pinning was dominant after low-energy ion irradiation. These results suggest that irradiation-induced defects can accumulate near the grain boundaries in metallic MgB₂ superconductors.

关键词: MgB₂ films, grain boundaries, flux pinning, low-energy ion irradiation

Abstract: We investigate the effect of ion irradiation on MgB₂ thin films with small grains of approximately 122 nm and 140 nm. The flux pinning by grain boundaries is insignificant in the pristine MgB₂ films due to good inter-grain connectivity, but is significantly improved after 120-keV Mn-ion irradiation. The scaling behavior of the flux pinning force density for the ion-irradiated MgB₂ thin films with nanoscale grains demonstrates the predominance of pinning by grain boundaries, in contrast to the single-crystalline MgB₂ films where normal point pinning was dominant after low-energy ion irradiation. These results suggest that irradiation-induced defects can accumulate near the grain boundaries in metallic MgB₂ superconductors.

Key words: MgB₂ films, grain boundaries, flux pinning, low-energy ion irradiation

中图分类号: (Metals; alloys and binary compounds)

74.70.Ad

74.25.Wx (Vortex pinning (includes mechanisms and flux creep)) 61.72.Mm (Grain and twin boundaries) 61.80.Lj (Atom and molecule irradiation effects)

Li Liu(刘丽), Jung Min Lee, Yoonseok Han, Jaegu Song, Chorong Kim, Jaekwon Suk, Won Nam Kang, Jie Liu(刘杰), Soon-Gil Jung, and Tuson Park. Effects of irradiation on superconducting properties of small-grained MgB₂ thin films[J]. 中国物理B, 2023, 32(12): 127402-127402.

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Effects of irradiation on superconducting properties of small-grained MgB₂ thin films

Effects of irradiation on superconducting properties of small-grained MgB₂ thin films

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