ISIS Neutron and Muon Source Data Journal

Probing collective excitations in Ba4NaRu3O12

Abstract: The quadruple perovskite Ba4NaRu3O12 is structurally unique, intermediate between dimer- and trimer based physics. The system undergoes an antiferromagnetic (AFM) transition at a relatively high temperature of ~265 K to an A-type arrangement with spins coupled ferromagnetically within the layer and antiferromagnetically between them, according to neutron powder diffraction (NPD) data collected at WISH. The spin directions are pinned along the c-axis. Both the NPD ordered moment at 13 K and the effective moment estimated from inverse susceptibility fits at high temperature (upto 390 K) reveal a moment suppression from the S=3/2 spin-only value of 3.87 muB. Previous magnetisation measurements upto 700 K have suggested that a slope change occurs in inverse susceptibility at ~520 K marking the onset of dimerisation between Ru moments within the face-shared octahedra. We propose to use MERLIN to map the full excitation spectrum of Ba4NaRu3O12 in a wide T-range to characterise the different types of exchange interaction driving the observed bulk behaviour, including the spin dimerisation, long-range order, excess specififc heat entropy and the subtle metamagnetic features observed below the Neel temperature.

Principal Investigator: Dr Shruti Chakravarty
Experimenter: Dr Ross Stewart
Local Contact: Dr Viviane Pecanha Antonio
Experimenter: Professor Lucy Clark

DOI: 10.5286/ISIS.E.RB2620458

ISIS Experiment Number: RB2620458

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 Shruti Chakravarty et al; (2026): Probing collective excitations in Ba4NaRu3O12, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2620458

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