This data archive covers the sample characterisation and magnetometry data referenced in the paper. Neutron scattering data, performed at the ILL, is available from the ILL DOIs and reposisitory as stated in the manuscript. The directories contain: Laue camera screening images of various candidate samples. Sample 5E-1 was the principal one used in the work. MPMS SQUID magnetisation data, as shown in the manuscript Electro-dispersive x-ray results, to measure elemental composition percentages and image the crystals Powder x-ray diffraction data to verify phase purity.