ISIS Neutron and Muon Source Data Journal

Neutron diffraction study of Dy-4f anisotropy effects on Ru2 and Ir2 dimer ordering in Ba3DyRu2O9 and Ba3DyIr2O9

Abstract: Ba3DyRu2O9 and Ba3DyIr2O9 are closely related 6H-hexagonal perovskites that show markedly different magnetic transitions, pointing to different spin coupling between Dy 4f moments and Ru/Ir dimer sublattices. Previous studies report multiple anomalies in Ba3DyRu2O9 near 33 K and 27-28 K, together with the onset of antiferromagnetic order around 5.8 K, whereas Ba3DyIr2O9 exhibits a single transition near 8.9 K. Our heat-capacity, ZF-uSR, and preliminary MERLIN inelastic neutron scattering results are broadly consistent with these contrasting behaviours. However, the microscopic origin of this contrast remains unresolved. We therefore propose temperature-dependent neutron diffraction on WISH to determine the magnetic structures, moment directions, and ordered moment sizes in both compounds, and to track their evolution across the transition region. These measurements will clarify whether the two systems follow different ordering pathways and provide insight into 4f-4d/5d coupling in dimer-based hexagonal perovskites.

Principal Investigator: Dr Jing Ming
Local Contact: Dr Pascal Manuel
Experimenter: Dr Yajun Yue
Experimenter: Dr Devashi Adroja

DOI: 10.5286/ISIS.E.RB2620840

ISIS Experiment Number: RB2620840

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Jing Ming et al; (2026): Neutron diffraction study of Dy-4f anisotropy effects on Ru2 and Ir2 dimer ordering in Ba3DyRu2O9 and Ba3DyIr2O9, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2620840

Data is released under the CC-BY-4.0 license.