Evolution of nematic fluctuations in CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ with spin-vortex crystal magnetic order

Anna E. Böhmer, Fei Chen, William R. Meier +11

The CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ superconductors resemble the archetypal 122-type iron-based materials but have a crystal structure with distinctly lower symmetry. This fa…