ISIS Neutron and Muon Source Data Journal

Valence bond solid in the charge ordered state of Rb4O6

Abstract: Open p-shell anionic mixed-valence compounds have been recently proposed as intriguing model systems for disentangling the complex interplay of charge, lattice, orbital, and spin degrees of freedom in Verwey-type charge ordering processes. Our preliminary electron paramagnetic resonance experiments on Rb4O6 have shown a zero-field spin gap of about 450 GHz, which can be closed with a magnetic field of 14.5 T. The results are consistent with formation of O2- (S = 1/2) dimers with a singlet ground state and indicate the presence of additional inter-dimer isotropic and intra-dimer Dzyaloshinskii-Moriya interactions, thus questioning the true ground state that could either be a valence bond solid or a long-range magnetic order with reduced ordered moments. Here we propose to carry out a muSR investigation down to the lowest experimentally accessible temperatures to answer this question.

Principal Investigator: Dr Denis Arcon
Experimenter: Dr Martin Jansen
Experimenter: Dr Peter Adler
Experimenter: Mr Tilen Knaflic
Experimenter: Dr Andrej Zorko
Local Contact: Dr Pabitra Biswas

DOI: 10.5286/ISIS.E.RB1820363

ISIS Experiment Number: RB1820363

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 Denis Arcon et al; (2019): Valence bond solid in the charge ordered state of Rb4O6, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1820363

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