ISIS Neutron and Muon Source Data Journal

CEF spectroscopy of Ba2YbBiO6: the only trigonal member of the Ba2LnBiO6 series

Abstract: Ba2YbBiO6 is a uniquely promising target for inelastic neutron scattering because it is the only trigonal/rhombohedral member of the Ba2LnBiO6 rare-earth series; the other known members are monoclinic, orthorhombic, or cubic. This makes the Yb compound structurally distinct within the family and the only member currently linked to a pseudo-two-dimensional triangular-lattice magnetic description. Recent bulk measurements on polycrystalline Ba2YbBiO6 show antiferromagnetic interactions, no long-range magnetic order down to 2 K, and a low-temperature Kramers-doublet ground state consistent with an effective Jeff =1/2 picture. However, the proposed crystal electric field (CEF) scheme, with excited doublets near 25, 60, and 110 meV, is based only on thermodynamic analysis and point-charge modeling and has not yet been verified by neutron spectroscopy. We therefore propose a powder INS experiment on MARI using 5 g of Ba2YbBiO6 to directly determine the Yb3+ CEF excitations and establish whether its low-energy magnetism is indeed governed by an isolated Jeff=1/2 manifold. A further challenge is that there is no same-structure non-magnetic analog in this series, making direct spectroscopic determination especially important.

Principal Investigator: Dr Bin Gao
Local Contact: Dr Gøran Nilsen

DOI: 10.5286/ISIS.E.RB2620313

ISIS Experiment Number: RB2620313

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 Bin Gao et al; (2026): CEF spectroscopy of Ba2YbBiO6: the only trigonal member of the Ba2LnBiO6 series, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2620313

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