Magnetic structure and properties of the honeycomb antiferromagnet [Na(OH 2 ) 3 ]Mn(NCS) 3 †
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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 P3̄′. Low temperature second-harmonic generation (SHG) measurements provide no evidence of breaking of the centre of symmetry.
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Acknowledgements: M. G. acknowledges the ILL Graduate School for provision of a studentship. M. J. C. acknowledges funding from UKRI (EP/X042782/1) and the Hobday Bequest, School of Chemistry, University of Nottingham. We acknowledge the ILL for beamtime under proposal numbers 5-41-1167. Raw data sets from ILL experiments can be accessed via links provided in references. SHG measurements were performed using equipment funded by EPSRC strategic equipment grant EP/P001394/1.
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