Dataset
Bond-dependent exchange, order-by-disorder and nodal quasiparticles' intensity signature in a honeycomb cobaltate
- Documentation:
- Recent theoretical proposals have argued that cobaltates with edge-sharing octahedral coordination can have significant bond-dependent exchange couplings thus offering a platform in 3d ions for such physics beyond the much-explored realizations in 4d and 5d materials. Here we present high-resolution inelastic neutron scattering data within the magnetically ordered phase of the stacked honeycomb magnet CoTiO3 revealing the presence of a finite energy gap and demonstrate that this implies the presence of bond-dependent anisotropic couplings. We also show through an extensive theoretical analysis that the gap further implies the existence of a quantum order-by-disorder mechanism that, in this material, crucially involves virtual crystal field fluctuations. Our data also provide an experimental observation of a universal winding of the scattering intensity in angular scans around linear band-touching points for both magnons and dispersive spin-orbit excitons, which is directly related to the non-trivial topology of the quasiparticle wavefunction in momentum space near nodal points. The deposited data package contains neutron powder diffraction and single crystal inelastic neutron scattering data to probe the magnetic ordering and dynamics. The zip archive contains the data in the format of multi-column ASCII files, a README.txt that explains the content of all the files and matlab code to plot the data in all the files, together with relevant RGB colourmap.
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Authors/Creators
+ H2020 European Research Council
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- Funder identifier:
- http://dx.doi.org/10.13039/100010663
- Funding agency for:
- Prabhakaran, D
- Coldea, R
- Grant:
- 788814 (EQFT )
+ Royal Society
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- Funding agency for:
- Johnson, R D
- Grant:
- Royal Society University Research Fellowship
+ National Science Foundation
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- Funding agency for:
- Coldea, R
- Grant:
- PHY-1748958
- Publisher:
- University of Oxford
- Publication date:
- 2021
- DOI:
- Language:
-
English
- Keywords:
- Subjects:
- Deposit date:
-
2021-04-07
Terms of use
- Copyright holder:
- Radu Coldea
- Copyright date:
- 2021
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