Matan K.Ono T.Ohira-Kawamura S.Nakajima K.Nambu Y.Sato T.J.Mahidol University2023-06-182023-06-182022-04-01Physical Review B Vol.105 No.13 (2022)24699950https://repository.li.mahidol.ac.th/handle/20.500.14594/85090The 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.Materials ScienceArticleSCOPUS10.1103/PhysRevB.105.1344032-s2.0-8512841921124699969