Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Effects of α-particle beam irradiation on superconducting properties of thin film MgB2 superconductors

  • Kim, Sangbum (IT Accelerator Engineering Center, Sungkyunkwan University) ;
  • Duong, Pham van (Department of Physics, Sungkyunkwan University) ;
  • Ha, Donghyup (Department of Electrical and Computer Engineering, Sungkyunkwan University) ;
  • Oh, Young-Hoon (Department of Physics, Sungkyunkwan University) ;
  • Kang, Won Nam (Department of Physics, Sungkyunkwan University) ;
  • Hong, Seung Pyo (Korea Institute of Radiological & Medical Sciences) ;
  • Kim, Ranyoung (Korea Institute of Radiological & Medical Sciences) ;
  • Chai, Jong Seo (School of Information & Communication Engineering, Sungkyunkwan University)
  • Received : 2016.06.14
  • Accepted : 2016.06.24
  • Published : 2016.06.30
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Abstract

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.

Keywords

References

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