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We applied polymethyl-methacrylate (PMMA) as a new doping material for MgB2 and fabricated C-doped MgB2 wires by in situ powder-in-tube (PIT) process. With increasing PMMA doping level, the transition temperature (Tc) decreased and the MgO content increased, whereas the magnetic field dependence of the critical current density (Jc) weakened. The MgB2 wires doped with 3–10wt.% PMMA showed significantly...
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