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We report the effect of carbon doping in Ti-stabilized nonstoichiometricmolybdenum diboride (Mo$_{0.96}$Ti$_{0.04}$)$_{0.8}$B$_{2}$, which exhibitsbulk superconductivity below $T_{\rm c}$ = 7.0 K. It is found that(Mo$_{0.96}$Ti$_{0.04}$)$_{0.8}$(B$_{1-x}$C$_{x}$)$_{2}$ maintains theAlB$_{2}$-type phase with a uniform elemental distribution for $x$ = 0.12 and0.16. The substitution of carbon for boron leads to a slight increase in$a$-axis, a remarkable reduction in $c$-axis, the formation of planar defectsalong the (100) crystallographic planes, and a shift of the B 1$s$ peakstowards higher binding energies. Contrary to(Mo$_{0.96}$Ti$_{0.04}$)$_{0.8}$B$_{2}$, however, no superconductivity isobserved down to 1.8 K for the C-doped samples, which is ascribed to theelectron filling of boron $\pi$ bands resulting from the carbon doping.

Effect of carbon doping on the structure and superconductivity in AlB$_{2}$-type (Mo$_{0.96}$Ti$_{0.04}$)$_{0.8}$B$_{2}$