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http://dx.doi.org/10.9714/psac.2014.16.2.036

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)
Publication Information
Progress in Superconductivity and Cryogenics / v.16, no.2, 2014 , pp. 36-41 More about this Journal
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.
Keywords
Superconducting critical temperature; critical current density; in situ process $MgB_2$ bulk; property reliability;
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