Chemical pressure tuning of competing orders in ${\text{Ba}}_{1-x}{\text{Ca}}_x{\text{Ni}}_2{\text{As}}_2$

F. Henssler, K. Willa, M. Frachet +5

$\mathrm{Ba}{\mathrm{Ni}}_2{\mathrm{As}}_2$, a structural-analogue to the iron-based parent compound $\mathrm{Ba}{\mathrm{Fe}}_2{\mathrm{As}}_2$, offers a unique platform to study…