摘要
We investigate the effect of ion irradiation on MgB_(2) thin films with small grains of approximately 122 nm and 140 nm.The flux pinning by grain boundaries is insignificant in the pristine MgB_(2) 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 MgB_(2) thin films with nanoscale grains demonstrates the predominance of pinning by grain boundaries,in contrast to the single-crystalline MgB_(2) 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 MgB_(2) superconductors.
作者
刘丽
Jung Min Lee
Yoonseok Han
Jaegu Song
Chorong Kim
Jaekwon Suk
Won Nam Kang
刘杰
Soon-Gil Jung
Tuson Park
Li Liu;Jung Min Lee;Yoonseok Han;Jaegu Song;Chorong Kim;Jaekwon Suk;Won Nam Kang;Jie Liu;Soon-Gil Jung;Tuson Park(Center for Quantum Materials and Superconductivity,Sungkyunkwan University,Suwon 16419,Republic of Korea;Department of Physics,Sungkyunkwan University,Suwon 16419,Republic of Korea;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China;Korea Multi-purpose Accelerator Complex,Korea Atomic Energy Research Institute,Gyeongju,Gyeongbuk 38180,Republic of Korea;Department of Physics Education,Sunchon National University,Suncheon 57922,Republic of Korea)
基金
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 NRF2021R1I1A1A01043885 (S.G.J.,Y.H.))
the National Natural Science Foundation of China (Grant Nos.12035019 (J.L.))
the Chinese Scholarship Council (CSC)for fellowship support。
