Abstract
The spin dynamics of the spin-1/2 kagome-lattice antiferromagnet is studied using high-resolution, time-of-flight inelastic neutron scattering. The flat mode, a characteristic of the frustrated kagome antiferromagnet, and the low-energy dispersive mode, which is dominated by magnons, can be well described by the linear spin-wave theory. However, the theory fails to describe three weakly dispersive modes between 9 and 14 meV. These modes could be attributed to two-spinon bound states, which decay into free spinons away from the zone center and at a high temperature, giving rise to continuum scattering.
- Received 2 February 2022
- Revised 3 March 2022
- Accepted 18 March 2022
DOI:https://doi.org/10.1103/PhysRevB.105.134403
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Physics Subject Headings (PhySH)
Condensed Matter, Materials & Applied Physics
