Enhanced Critical Current Density in the Carbon-Ion Irradiated MgB2 Thin Films

Title
Enhanced Critical Current Density in the Carbon-Ion Irradiated MgB2 Thin Films
Authors
송종한임원철정순길손승규듀옹 팜강원남박두순
Issue Date
2019-02
Publisher
Journal of the Physical Society of Japan
Citation
VOL 88-034716-6
Abstract
We report large improvement of the critical current density (Jc) of 400-nm-thick MgB2 thin films through carbon (C) ion irradiation. When 350 keV C ions with various dose levels ranging from 1 × 1013– 1 × 1015C atoms=cm2 are irradiated into the films, the c-axis lattice constant gradually expands with increase in the number of irradiated C ions and superconducting transition temperature (Tc) of the MgB2 films is suppressed. On the other hand, the field performance of Jc for the MgB2 films remarkably improves after irradiations, which is accompanied by the crossover of the pinning mechanism from weak collective to strong pinning. In addition, scaling behavior of flux pinning force for irradiated MgB2 films shows a dominance of normal point pinning, indicating that the improved field performance of Jc mainly originates from the point defects, such as vacancies and interstitials, created by C-ion irradiation. Our results suggest that carbon acts as an effective irradiating source as well as a doping source to improve Jc in high magnetic fields.
URI
http://pubs.kist.re.kr/handle/201004/69133
ISSN
0031-9015
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