Enhanced Superconducting Properties of MgB2 by Carbon Substitution Using Carbon Containing Nano Additives

A comparative study on the effect of doping of nano carbon, nano diamond and nano SiC in MgB2 is carried out.The JC(H) is significantly enhanced for all doped samples compared to the pure sample among which MgB1.9C0.1 (nano C) exhibits the best JC(H) performance. The enhanced performance is due to the effective substitution of C at B site which is confirmed by the systematic decrease in both a axis and TC.