Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Tc and Jc distribution in in situ processed MgB2 bulk superconductors with/without C doping

  • Kim, C.J. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Kim, Y.J. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Lim, C.Y. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Jun, B.H. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Park, S.D. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Choo, K.N. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute)
  • Received : 2014.06.09
  • Accepted : 2014.06.18
  • Published : 2014.06.30
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Abstract

Temperature dependence of magnetic moment (m-T) and the magnetization (M-H) at 5 K and 20 K of the in situ processed $MgB_2$ bulk pellets with/without carbon (C) doping were examined. The superconducting critical temperature ($T_c$), the superconducting transition width (${\delta}T$) and the critical current density ($J_c$) were estimated for ten test samples taken from the $MgB_2$ bulk pellets. The reliable m-T characteristics associated with the uniform $MgB_2$ formation were obtained for both $MgB_2$ pellets. The $T_cs$ and ${\delta}Ts$ of all test samples of the undoped $MgB_2$ were the same each other as 37.5 K and 1.5 K, respectively. The $T_cs$ and ${\delta}Ts$ of the C-doped $MgB_2$ were 36.5 K and 2.5 K, respectively. Unlike the m-T characteristics, there existed the difference among the M-H curves of the test samples, which might be caused by the microstructure variation. In spite of the slight $T_c$ decrease, the C doping was effective in enhancing the $J_c$ at 5 K.

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References

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