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

## TL;DR

This study investigates how carbon doping affects the structure and superconductivity of a Ti-stabilized molybdenum diboride compound, revealing structural changes and the suppression of superconductivity due to electron filling effects.

## Contribution

It demonstrates that carbon doping maintains the phase but suppresses superconductivity by altering electronic structure and inducing defects.

## Key findings

- Carbon doping maintains phase stability at certain levels.
- Superconductivity is suppressed with increased carbon doping.
- Structural and electronic changes explain the loss of superconductivity.

## Abstract

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.