Breakdown of linear spin-wave theory and existence of spinon bound states in the frustrated kagome-lattice antiferromagnet
Issued Date
2022-04-01
Resource Type
ISSN
24699950
eISSN
24699969
Scopus ID
2-s2.0-85128419211
Journal Title
Physical Review B
Volume
105
Issue
13
Rights Holder(s)
SCOPUS
Bibliographic Citation
Physical Review B Vol.105 No.13 (2022)
Suggested Citation
Matan K., Ono T., Ohira-Kawamura S., Nakajima K., Nambu Y., Sato T.J. Breakdown of linear spin-wave theory and existence of spinon bound states in the frustrated kagome-lattice antiferromagnet. Physical Review B Vol.105 No.13 (2022). doi:10.1103/PhysRevB.105.134403 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/85090
Title
Breakdown of linear spin-wave theory and existence of spinon bound states in the frustrated kagome-lattice antiferromagnet
Author(s)
Other Contributor(s)
Abstract
The spin dynamics of the spin-1/2 kagome-lattice antiferromagnet Cs2Cu3SnF12 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.