Potential Lifshitz transition at optimal substitution in nematic pnictide Ba${}_{1-x}$Sr${}_x$Ni${}_2$As${}_2$

Dushyant M. Narayan, Peipei Hao, Rafał Kurleto +11

BaNi${}_2$As${}_2$ is a structural analog of the pnictide superconductor BaFe${}_2$As${}_2$, which, like the iron-based superconductors, hosts a variety of ordered phases including charge…