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 - Funding Information:
We would like to thank H. Tanaka for fruitful discussion and for providing us with high-quality samples. Work at Mahidol University was supported in part by the National Research Council of Thailand (Grant No. N41A640158) and the Thailand Center of Excellence in Physics (ThEP). The experiment on Amateras was performed with the approval of J-PARC (Proposal No. 2012A0090).
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 -