Chiral weak ferromagnets formed in one-dimensional organic-inorganic hybrid manganese chloride hydrates.

Chiral weak ferromagnets were developed in organic-inorganic hybrid systems of one-dimensional manganese(II) chloride hydrate with chiral organic cations of ( S )- and ( R )-β-methylphenethylammonium (= ( S )- and ( R )-MPA + ), [( S )/( R )-MPA] 2 [MnCl 4 (H 2 O)]. The weak ferromagnetic phase found below 3.2 K could be attributed to a spin canting antiferromagnetic state induced by Dzyaloshinskii-Moriya interactions owing to spatial inversion symmetry breaking in chirality introduced systems. This is the first chiral weak ferromagnet found in a spin chain of deformed perovskite derivatives with a corner-sharing structure of transition metal halide hydrates.