ISIS Neutron and Muon Source Data Journal

Quantum dynamics in a J_eff=1/2 isotropic triangular-lattice antiferromagnet

Abstract: This proposal is part of our research programme to explore the spin dynamics of strongly-frustrated quantum antiferromagnets. A canonical model system is the spin-1/2 triangular antiferromagnet for which many theoretical predictions such as quantum-fluctuations induced anomalous lineshape broadenings and roton-like minima in the dispersion have not been experimentally explored. In recent powder experiments we found that Ba3CoSb2O9 is a unique realization of such as system with i) a density of states consistent with an anomalous softening at the zone boundary as expected for roton-like minima and ii) strong scattering continuum at high energies indicating quantum dynamics beyond the linear spin-wave approximation. To explore such effects in detail we propose a single crystal experiment to map the excitations in the full Brillouin zone and compare with theories of quantum dynamics.

Principal Investigator: Professor Radu Coldea
Experimenter: Miss Stephanie Williams
Experimenter: Dr Alun Biffin

DOI: 10.5286/ISIS.E.RB1510491

ISIS Experiment Number: RB1510491

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:
Professor Radu Coldea et al; (2015): Quantum dynamics in a J_eff=1/2 isotropic triangular-lattice antiferromagnet, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1510491

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