We report the magnetic structure and properties of a thiocyanate-based honeycomb magnet [Na(OH₂)₃]Mn(NCS)₃ which crystallises in the unusual low-symmetry trigonal space group P3̄. Magnetic measurements on powder samples show this material is an antiferromagnet (ordering temperature (TN,mag = 18.1(6)\,)K) and can be described by nearest neighbour antiferromagnetic interactions $J=-11.07(4)\,$K. A method for growing neutron-diffraction sized single crystals (10 mm³) is demonstrated. Low temperature neutron single crystal diffraction shows that the compound adopts the collinear antiferromagnetic structure with TN,neut= 18.94(7)\,K, magnetic space group P 3̄'. Low temperature second-harmonic generation (SHG) measurements provide no evidence of breaking of the centre of symmetry.
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Geers et al. (2024) studied this question.
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