Antiferromagnetic ordering in two-dimensional A2Ga2S5 (A = Fe, Mn) with puckered hexagonal nets

This proposal is to explore the magnetic ordering present in a family of two-dimensional ternary metal chalcogenides Fe2Ga2S5 and Mn2Ga2S5 containing Fe2+ and Mn2+ ions arranged in unusual puckered hexagonal nets arising from a bilayer of triangular nets with coupling provided by sulfide ions. Neutron diffraction will be key to deducing experimentally the nature of the magnetic ordering.