ISIS Neutron and Muon Source Data Journal

Magnetic excitations in the S = 1/2 frustrated Kagome antiferromagnet Mg-Averievite Cu3Mg2V2O10CsCl

Abstract: We propose inelastic neutron scattering measurements on the MARI spectrometer to determine the magnetic excitation spectrum of Mg2Cu3V2O10CsCl (Mg2-averievite), a new oxide S = 1/2 kagome Heisenberg antiferromagnet and promising quantum spin liquid (QSL) candidate. Building on our previous neutron studies of Zn-doped averievite, which revealed an evolution from long-range magnetic order to diffuse magnetic excitations consistent with increasing frustration, we have developed an alternative route to an ideal Cu2+ kagome lattice through Mg substitution. Combined X-ray, electron diffraction, EDX and bulk magnetometry demonstrate successful preferential Mg occupation of the interlayer hexagonal Cu site, minimal kagome-site disorder, suppressed magnetic order down to 2 K, and strong antiferromagnetic interactions (theta_W ~ -240 K), establishing Mg2-averievite as a highly promising new kagome model system. We propose INS measurements over 1.4 200 K and incident energies of 6 30 meV to determine whether Mg2-averievite hosts conventional spin-wave excitations, diffuse continuum-like excitations associated with fractionalised spinons, or signatures of quantum critical behavior analogous to that suggested in Zn2-averievite. These measurements will establish the magnetic energy scale, constrain exchange interactions, distinguish intrinsic kagome physics from defect contributions, and determine whether Mg2-averievite realizes a distinct QSL ground state within the averievite family.

Principal Investigator: Mr Lewis Giannelli
Experimenter: Dr Ursula Bengaard Hansen
Experimenter: Ms Barbara Jarzabek
Experimenter: Dr Ethan Lowe
Experimenter: Mr David Boldrin
Local Contact: Dr Duc Le

DOI: 10.5286/ISIS.E.RB2620779

ISIS Experiment Number: RB2620779

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:
Mr Lewis Giannelli et al; (2026): Magnetic excitations in the S = 1/2 frustrated Kagome antiferromagnet Mg-Averievite Cu3Mg2V2O10CsCl, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2620779

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