Abstract
Doping effects of TiC and Mo2C on critical current properties and microstructures of MgB2 short tapes were systematically studied. Reduction of Tc and shortening of a-axis length were found to be derived from the substitution of carbon, independent of carbon source. Enhanced critical current properties under high magnetic fields were observed in the TiC, Mo2C doped samples. Grain growth of MgB2, which means a decrease of grain boundaries, i.e. reduction of effective pinning center density, was suppressed by TiC or Mo2C doping. Moreover, field dependence of Jc at low temperatures ~5 K was found to be strongly correlated with the actual carbon content of the MgB2 lattice. Our results suggest that control of actual carbon content in the MgB2 bulk is crucially important for improvement of Jc under magnetic fields
Published Version
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