Abstract
We have fabricated the superconducting <TEX>$MgB_2$</TEX>/carbon fiber by physical vapor deposition method. Mg (Magnesium) and B (Boron) were simultaneously deposited on the carbon fiber using the RF-sputtering and thermal evaporation, respectively. To ensure the relatively high vapor pressure of Mg at the growth region and the subsequent phase stability of <TEX>$MgB_2$</TEX> at the deposition temperature, inverted funnel-like guide made of Mg-foil was employed while one side of the guide were open for the sputtered B flux. Mg vapor pressure should be controlled precisely to secure the complete reaction. The <TEX>$MgB_2$</TEX>/carbon fiber showed a uniformly deposited thin layer with dense and well-formed grains. The <TEX>$MgB_2$</TEX>/carbon fibers in this study showed <TEX>$T_c$</TEX>~37.5K, <TEX>$J_c$</TEX> ~ <TEX>$2{\times}10^4\;A/cm^2$</TEX> in the 20K, 0T.
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