Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Effect of thermal annealing on low-energy C-ion irradiated MgB2 thin films

  • Jung, Soon-Gil (Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University) ;
  • Son, Seung-Ku (Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University) ;
  • Pham, Duong (Department of Physics, Sungkyunkwan University) ;
  • Lim, W.C. (Advanced Analysis Center, Korea Institute of Science and Technology (KIST)) ;
  • Song, J. (Advanced Analysis Center, Korea Institute of Science and Technology (KIST)) ;
  • Kang, W.N. (Department of Physics, Sungkyunkwan University) ;
  • Park, T. (Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University)
  • Received : 2019.07.22
  • Accepted : 2019.07.26
  • Published : 2019.09.30
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Abstract

We investigate the effect of thermal annealing on $MgB_2$ thin films with thicknesses of 400 and 800 nm, irradiated by 350 keV C-ions with a dose of $1{\times}10^{15}atoms/cm^2$. Irradiation by low-energy C-ions produces atomic lattice displacement in $MgB_2$ thin films, improving magnetic field performance of critical current density ($J_c$) while reducing the superconducting transition temperature ($T_c$). Interestingly, the lattice displacement and the $T_c$ are gradually restored to the original values with increasing thermal annealing temperature. In addition, the magnetic field dependence of $J_c$ also returns to that of the pristine state together with the restoration of $T_c$. Because $J_c$(H) is sensitive to the type and density of the disorder, i.e. vortex pinning, the recovery of $J_c$(H) in irradiated $MgB_2$ thin films by thermal annealing indicates that low-energy C-ion irradiation on $MgB_2$ thin films primarily causes lattice displacement. These results provide new insights into the application of low-energy irradiation in strategically engineering critical properties of superconductors.

Keywords

References

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