TY - JOUR
T1 - Breakdown of linear spin-wave theory and existence of spinon bound states in the frustrated kagome-lattice antiferromagnet
AU - Matan, K.
AU - Ono, T.
AU - Ohira-Kawamura, S.
AU - Nakajima, K.
AU - Nambu, Y.
AU - Sato, T. J.
N1 - Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.105.134403
DO - 10.1103/PhysRevB.105.134403
M3 - Article
AN - SCOPUS:85128419211
SN - 2469-9950
VL - 105
JO - Physical Review B
JF - Physical Review B
IS - 13
M1 - 134403
ER -