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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 Kang2,†, Jie Liu(刘杰)3,4,‡, Soon-Gil Jung6,§, and Tuson Park1,2,¶ |
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 |
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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.
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Received: 20 June 2023
Revised: 21 August 2023
Accepted manuscript online: 01 September 2023
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PACS:
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74.70.Ad
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(Metals; alloys and binary compounds)
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74.25.Wx
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(Vortex pinning (includes mechanisms and flux creep))
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61.72.Mm
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(Grain and twin boundaries)
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61.80.Lj
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(Atom and molecule irradiation effects)
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| Fund: 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. |
Corresponding Authors:
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
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Cite this article:
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 2023 Chin. Phys. B 32 127402
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