ISIS Neutron and Muon Source Data Journal

Magnetic excitations of spin-orbital coupled Ir-Ir dimers in Ba3XIr2O9, X = Y or Sc

Abstract: Studies of iridium-based compounds are at the forefront of solid state physics research. In these materials the electronic configurations are driven by strong spin-orbit coupling (SOC). We are currently investigating the spin frustration in an ambient pressure phase of Ba3YIr2O9 (Ir4.5+), using various experimental techniques, where one lone electron is shared over a structural Ir dimer, and a small magnetic moment order occurs for frustrated antiferromagnetic interactions on a hexagonal lattice. In Ba3YIr2O9 our zero-field muon spin rotation study reveals evidence of a long range magnetic ordering below 4 K, in agreement with heat capacity. Here we proposal to investigate the low energy magnetic excitations spectrum of Ba3YIr2O9 and Ba3ScIr2O9 using LET. Where in Ba3ScIr2O9 the effect of small scale Sc-Ir site disorder, TC = 9 K, will be investigated. This study will provide information on the intra-dimer and inter-dimer interactions as well as the effect of SOC on the spin gap, hence allowing modelling the spin-Hamiltonian of Ba3YIr2O9 and Ba3ScIr2O9. We have also submitted a neutron diffraction proposal on WISH to investigate the magnetic structure of Ba3YIr2O9, and Ba3ScIr2O9.

Local Contact: Dr Ross Stewart

DOI: 10.5286/ISIS.E.RB2320066

ISIS Experiment Number: RB2320066

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 Ross Stewart; (2023): Magnetic excitations of spin-orbital coupled Ir-Ir dimers in Ba3XIr2O9, X = Y or Sc, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2320066

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