한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제16권1호
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  • Pages.9-13
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  • 2014
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
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Effects of neutron irradiation on superconducting critical temperatures of in situ processed MgB2 superconductors

  • Kim, C.J. (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Park, S.D. (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Jun, B.H. (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Kim, B.G. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Choo, K.N. (Advanced Nuclear Fuel Development Division, Korea Atomic Energy Research Institute) ;
  • Ri, H.C. (Physics Department, Kyungpook National University)
  • 투고 : 2014.02.05
  • 심사 : 2014.02.18
  • 발행 : 2014.03.31
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초록

Effects of neutron irradiation on the superconducting properties of the undoped $MgB_2$ and the carbon(C)-doped $MgB_2$ bulk superconductors, prepared by an in situ reaction process using Mg and B powder, were investigated. The prepared $MgB_2$ samples were neutron-irradiated at the neutron fluence of $10^{16}-10^{18}n/cm^2$ in a Hanaro nuclear reactor of KAERI involving both fast and thermal neutron. The magnetic moment-temperature (M-T) and magnetization-magnetic field (M-H) curves before/after irradiation were obtained using magnetic property measurement system (MPMS). The superconducting critical temperature ($T_c$) and transition width were estimated from the M-T curves and critical current density ($J_c$) was estimated from the M-H curves using a Bean's critical model. The $T_cs$ of the undoped $MgB_2$ and C-doped $MgB_2$ before irradiation were 36.9-37.0 K and 36.6-36.8 K, respectively. The $T_cs$ decreased to 33.2 K and 31.6 K, respectively after irradiation at neutron fluence of $7.16{\times}10^{17}n/cm^2$, and decreased to 22.6 K and 24.0 K, respectively, at $3.13{\times}10^{18}n/cm^2$. The $J_c$ cross-over was observed at the high magnetic field of 5.2 T for the undoped $MgB_2$ irradiated at $7.16{\times}10^{17}n/cm^2$. The $T_c$ and $J_c$ variation after the neutron irradiation at various neutron fluences were explained in terms of the defect formation in the superconducting matrix by neutron irradiation.

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참고문헌

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피인용 문헌

  1. Neutron Irradiation of Electronic Materials at HANARO vol.02, pp.09, 2014, https://doi.org/10.4236/jamp.2014.29093