Structural, electronic, and magnetic properties of nearly ideal Jeff=12 iridium halides

Heavy transition metal magnets with Jeff=12 electronic ground states have attracted recent interest due to their penchant for hosting new classes of quantum spin liquids and superconductors. Unfortunately, model systems with ideal Jeff=12 states are scarce due to the importance of noncubic local distortions in most candidate materials. In this work, we identify a family of iridium halide systems [i.e., K2IrCl6, K2IrBr6, (NH4)2IrCl6, and …