Effects of irradiation on superconducting properties of small-grained MgB 2 thin films

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 irradiatio...

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Bibliographic Details
Published in:Chinese physics B 2023-12, Vol.32 (12), p.127402
Main Authors: Liu 刘, Li 丽, Min Lee, Jung, Han, Yoonseok, Song, Jaegu, Kim, Chorong, Suk, Jaekwon, Nam Kang, Won, Liu 刘, Jie 杰, Jung, Soon-Gil, Park, Tuson
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Language:English
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Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/acf5d3