earticle

영어

We have fabricated the superconducting MgB2/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 MgB2 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 MgB2/carbon fiber showed a uniformly deposited thin layer with dense and well-formed grains. The MgB2/carbon fibers in this study showed Tc ~37.5K, Jc ~ 2×104 A/cm2 in the 20K, 0T.