Magnetism on quasi-1-D lattices in novel non-centrosymmetric Ba 3 CrVS 4 O 3 and in centrosymmetric La 3 TM WS 3 O 6 ( TM = Cr, Fe, Co)

Abstract La3TMWS3O6 (TM = Fe, Co) and novel Ba3CrVS4O3 can be obtained as pure polycrystalline samples by mineralizer aided solid-state reactions and a solid-state reaction with further purification by water, respectively. In contrast, La3CrWS3O6 needs a standard solid-state reaction to form but the final product contains observable impurities. All four compounds contain similar quasi-1-D magnetic lattices although La-based ones are centrosymmetric (P63/m) and the Ba-containing one is polar and non-centrosymmetric (P63). Strong antiferromagnetic couplings are observed along the magnetic chains in the Fe and Cr containing compounds. As a result, short-range magnetic order is suggested at low temperatures for the Fe-chain, which can be related to magneto-electric couplings. The Co3+-homologue shows typical diamagnetic behavior, as supported by its insulating nature, which is due to a low-spin state. The polar Cr3+-compound exhibits very different magnetic behavior compared to its corresponding non-polar relative. This proves a strong influence on the physical properties from the crystallographic symmetry.