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Kim, Sangbum,Duong, Pham van,Ha, Donghyup,Oh, Young-Hoon,Kang, Won Nam,Hong, Seung Pyo,Kim, Ranyoung,Chai, Jong Seo The Korea Institute of Applied Superconductivity a 2016 한국초전도저온공학회논문지 Vol.18 No.2
Superconducting properties of thin film MgB2 superconductors irradiated with 45 MeV ${\alpha}$-particle beam were studied. After the irradiation, enhancement of the critical current density and pinning force was observed, scaling close to strong pinning formula. Double logarithmic plots of the maximum pinning force density with irreversible magnetic field show a power law behavior close to carbon-doped MgB2 film or polycrystals. Variation of normalized pinning force density in the reduced magnetic field suggests scaling formulas for strong pinning mechanism like planar defects. We also observed a rapid decay of critical current density as the vortex lattice constant decreases, due to the strong interaction between vortices and increasing magnetic field.
SangbumKim,Pham van Duong,Donghyup Ha,Young-Hoon Oh,Won Nam Kang,Seung Pyo Hong,Ranyoung Kim,Jong Seo Chai 한국초전도.저온공학회 2016 한국초전도저온공학회논문지 Vol.18 No.2
Superconducting properties of thin film MgB2 superconductors irradiated with 45 MeV -particle beam were studied. After the irradiation, enhancement of the critical current density and pinning force was observed, scaling close to strong pinning formula. Double logarithmic plots of the maximum pinning force density with irreversible magnetic field show a power law behavior close to carbon-doped MgB2 film or polycrystals. Variation of normalized pinning force density in the reduced magnetic field suggests scaling formulas for strong pinning mechanism like planar defects. We also observed a rapid decay of critical current density as the vortex lattice constant decreases, due to the strong interaction between vortices and increasing magnetic field.