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Heavy transition metal magnets with $J_{\rm eff}$ $=$ 1/2 electronic groundstates have attracted recent interest due to their penchant for hosting newclasses of quantum spin liquids and superconductors. Unfortunately, modelsystems with ideal $J_{\rm eff}$ $=$ 1/2 states are scarce due to theimportance of non-cubic local distortions in most candidate materials. In thiswork, we identify a family of iridium halide systems [i.e. K$_2$IrCl$_6$,K$_2$IrBr$_6$, (NH$_4$)$_2$IrCl$_6$, and Na$_2$IrCl$_6 \cdotp $ 6(H$_2$O)] withIr$^{4+}$ electronic ground states in extremely close proximity to the ideal$J_{\rm eff}$ $=$ 1/2 limit, despite a variation in the low-temperature globalcrystal structures. We also find ordered magnetic ground states for the threeanhydrous systems, with single crystal neutron diffraction on K$_2$IrBr$_6$revealing Type-I antiferromagnetism. This spin configuration is consistent withexpectations for significant Kitaev exchange in a face-centered-cubic magnet.

Structural, electronic, and magnetic properties of nearly-ideal $J_{\rm eff}$ $=$ 1/2 iridium halides