We report the effect of carbon doping in Ti-stabilized nonstoichiometric molybdenum diboride (Mo$_{ 0.96}$Ti$_{ 0.04}$)$_{ 0.8}$B$_{ 2}$, which exhibits bulk 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 the AlB$_{ 2}$-type phase with a uniform elemental distribution for $x$ = 0.12 and 0.16. The substitution of carbon for boron leads to a slight increase in $a$-axis, a remarkable reduction in $c$-axis, the formation of planar defects along the (100) crystallographic planes, and a shift of the B 1$s$ peaks towards higher binding energies. Contrary to (Mo$_{ 0.96}$Ti$_{ 0.04}$)$_{ 0.8}$B$_{ 2}$, however, no superconductivity is observed down to 1.8 K for the C-doped samples, which is ascribed to the electron filling of boron $\pi$ bands resulting from the carbon doping.
Categories: cond-mat.supr-con cond-mat.mtrl-sci