ISIS Neutron and Muon Source Data Journal

Spin excitations in the non-magnetic ground state of In2Ru2O7

Abstract: Correlated transition-metal oxides with orbital degeneracy such as ruthenates with d4 (S = 1) configuration offer a plethora of unconventional electronic states. Combined with geometrical frustration, such materials may display exotic spin-orbital ordering phenomena. We discovered a new pyrochlore ruthenate In2Ru2O7, which undergoes a magnetic transition at ~ 220 K with a sharp drop of magnetic susceptibility to nearly zero simultaneously with a structural transition. This behaviour may point to a spin-singlet formation accompanying orbital order as observed in other ruthenates. muSR data excludes the presence of long-range antiferromagnetic order. In order to evidence a spin-singlet ground state, an observation of an excitation from a spin-singlet to spin-triplet is significant. We propose to perform inelastic neutron scattering on Merlin to detect the possible spin-gap of In2Ru2O7.

Principal Investigator: Dr Tomohiro Takayama
Local Contact: Dr Helen Walker
Experimenter: Professor Hidenori Takagi
Experimenter: Dr Aleksandra Krajewska
Experimenter: Dr Alexandra Gibbs
Local Contact: Dr Gøran Nilsen

DOI: 10.5286/ISIS.E.RB1920303

ISIS Experiment Number: RB1920303

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 Tomohiro Takayama et al; (2019): Spin excitations in the non-magnetic ground state of In2Ru2O7, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1920303

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