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{\alpha}-SrCr2O4 has a triangular planar lattice of d3 Cr3+ made from edgesharing CrO6 octahedra; the plane shows a very small orthorhombic distortionfrom hexagonal symmetry. With a Weiss temperature of -596 K and athree-dimensional magnetic ordering temperature of 43 K, the magnetic system isquasi two-dimensional and frustrated. Neutron powder diffraction shows that theordered state is an incommensurate helical magnet, with an in-plane propagationvector of k = (0,0.3217(8),0). Temperature dependent synchrotron powderdiffraction characterization of the structure shows an increase in theinter-plane spacing on cooling below 100 K and an inflection in the cellparameters at the magnetic ordering temperature. These anomalies indicate thepresence of a moderate degree of magneto-structural coupling.

Helical magnetism and structural anomalies in triangular lattice {\alpha}-SrCr2O4