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Ba(Ni$_{1-x}$Co$_x$)$_2$As$_2$ is a structural homologue of the pnictide hightemperature superconductor, Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$, in which the Featoms are replaced by Ni. Superconductivity is highly suppressed in thissystem, reaching a maximum $T_c$ = 2.3 K, compared to 24 K in its iron-basedcousin, and the origin of this $T_c$ suppression is not known. Using x-rayscattering, we show that Ba(Ni$_{1-x}$Co$_x$)$_2$As$_2$ exhibits aunidirectional charge density wave (CDW) at its triclinic phase transition. TheCDW is incommensurate, exhibits a sizable lattice distortion, and isaccompanied by the appearance of $\alpha$ Fermi surface pockets inphotoemission [B. Zhou et al., Phys. Rev. B 83, 035110 (2011)], suggesting itforms by an unconventional mechanism. Co doping suppresses the CDW, parallelingthe behavior of antiferromagnetism in iron-based superconductors. Our studydemonstrates that pnictide superconductors can exhibit competing CDW order,which may be the origin of $T_c$ suppression in this system.

Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba(Ni$_{1-x}$Co$_x$)$_2$As$_2$