Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Enhanced upper critical fields in low energy iron-irradiated single-crystalline MgB2 thin films

  • Pham, Duong (Department of Physic, Sungkyunkwan University) ;
  • Jung, Soon-Gil (Center for Quantum Materials and Superconductivity (CQMS) and Department of Physics, Sungkyunkwan University) ;
  • Tran, Duc H. (Faculty of Physics, VNU-University of Science) ;
  • Park, Tuson (Center for Quantum Materials and Superconductivity (CQMS) and Department of Physics, Sungkyunkwan University) ;
  • Kang, Won Nam (Department of Physic, Sungkyunkwan University)
  • Received : 2019.09.09
  • Accepted : 2019.09.27
  • Published : 2019.09.30
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Abstract

We studied the effect of Fe ion irradiation on the upper critical field ($H_{c2}$) of 410 nm single-crystalline $MgB_2$ thin films. The irradiation energy was fixed at 140 keV when we increased the irradiation doses from $1{\times}10^{14}ion/cm^2$ to $4{\times}10^{14}ion/cm^2$. We found that $H_{c2}$ significantly increase with increasing irradiation dose, despite the low irradiation energy. The enhancement of $H_{c2}$ could be explained by the reduction of electron mean free path caused by defects induced from irradiation, leading to a decrease of coherence length (${\xi}$). We also discussed the effect of irradiation on temperature-dependent resistivity in details.

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References

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