The layered RuBr3–RuI3 honeycomb system

Abstract

The layered RuBr₃–RuI₃ honeycomb structure solid solution was synthesized at high pressures. The crystal structures are centrosymmetric (space group R) and based on honeycomb layers of spin ½ Ru³⁺. The solid solution switches from insulating to metallic between RuBr_0.75I_2.25 and RuBr_0.50I_2.50. A preliminary structure/property phase diagram is presented. Our results suggest that this solid solution may provide insight into the influence of disorder on spin–orbit-coupled quantum spin liquids.