Magnetism in a family of $S=1$ square lattice antiferromagnets Ni$X_2$(pyz)${}_2$ ($X=$ Cl, Br, I, NCS; pyz = pyrazine)

J. Liu, P. A. Goddard, J. Singleton +23

The crystal structures of Ni$X_2$(pyz)${}_2$ ($X$ = Cl (\textbf{1}), Br (\textbf{2}), I (\textbf{3}) and NCS (\textbf{4})) were determined at 298~K by synchrotron X-ray powder diffra…