Abstract
MgB 2 related compounds such as the borocarbides LiBC and MgB 2 C 2 , and the nominal compound of “BeB 2 ” were synthesized and existence of superconductivity investigated by low field magnetic susceptibility measurements. Superconductivity was observed not to occur in all of the compounds down to a temperature of 2 K which agrees with recent calculations on the borocarbides, Hole doping of MgB 2 C 2 has been predicted to be favorable for superconductivity due to the flat band (in the T–Y direction) similar to one in MgB 2 . Attempts to substitutionally hole dope MgB 2 C 2 with alkali metals were carried out for the first time, with Li doping demonstrated to appear to be feasible, but in the present samples superconductivity was not observed.
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