Quantum dynamics in a J_eff=1/2 isotropic triangular-lattice antiferromagnet
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.
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- 27hx22w
- 28 2
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- 3 5meV
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- 50x27
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- 65 7999999999999
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- 83 2999999999999
- 83 7
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- BCSO9
- BaCoSbO9
- H 27
- Materials
- Physics
- Rot
- Rot 48 5
- T 1 7K
- T 2 1K
- T 2K
- T 35K
- T 73K
- T 8
- V 22
- WB
- bottom
- chop1
- chop1 4
- chop1 4 5
- cooling
- horiz 27
- hz
- jaws
- only
- open
- top
- vgap
| Provenance | |
|---|---|
| Creator | Miss Stephanie Williams; Professor Radu Coldea; Dr Alun Biffin |
| Publisher | ISIS Neutron and Muon Source |
| Publication Year | 2018 |
| Rights | CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/ |
| OpenAccess | true |
| Contact | isisdata(at)stfc.ac.uk |
| Representation | |
|---|---|
| Resource Type | Dataset |
| Discipline | Natural Sciences; Physics |
| Temporal Coverage Begin | 2015-06-04T09:00:00Z |
| Temporal Coverage End | 2015-10-01T07:00:00Z |