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Journal Articles

Coupled dimerized alternating-bond quantum spin chains in the distorted honeycomb-lattice magnet Cu$$_{5}$$SbO$$_{6}$$

Piyakulworawat, C.*; Morita, Katsuhiro*; Fukumoto, Yoshiyuki*; Hsieh, W.-Y.*; Chen, W.-T.*; Nakajima, Kenji; Kawamura, Seiko; Zhao, Y.*; Wannapaiboon, S.*; Piyawongwatthana, P.; et al.

Physical Review Research (Internet), 8(1), p.013247_1 - 013247_16, 2026/03

https://doi.org/10.1103/vdgg-d128

We analyze powder-averaged inelastic neutron scattering and magnetization data for the distorted honeycomb compound Cu$$_{5}$$SbO$$_{6}$$ using a first-order dimer expansion calculation and quantum Monte Carlo simulations. We show that, in contrast to the previously proposed honeycomb lattice model, Cu$$_{5}$$SbO$$_{6}$$ accommodates interacting dimerized spin chains with alternating ferromagnetic-antiferromagnetic couplings along the chain. Moreover, unlike the typical couplings observed in other Cu$$^{2+}$$-based distorted honeycomb magnets, the spin chains in Cu$$_{5}$$SbO$$_{6}$$ primarily couple through an antiferromagnetic coupling that arises between the honeycomb layers, rather than the expected interchain coupling in the layers. This finding reveals a different magnetic coupling scheme for Cu$$_{5}$$SbO$$_{6}$$. In addition, utilizing X-ray spectroscopy and transmission electron microscopy, we also refine the crystal structure and stacking-fault model of the compound.

Journal Articles

Breakdown of linear spin-wave theory and existence of spinon bound states in the frustrated kagome-lattice antiferromagnet

Matan, K.*; Ono, Toshio*; Kawamura, Seiko; Nakajima, Kenji; Nambu, Yusuke*; Sato, Taku*

Physical Review B, 105(13), p.134403_1 - 134403_8, 2022/04

https://doi.org/10.1103/PhysRevB.105.134403
 Times Cited Count：4 Percentile：26.33(Materials Science, Multidisciplinary)

Spin dynamics of the spin-1/2 kagome-lattice antiferromagnet Cs$$_{2}$$Cu$$_{3}$$SnF$$_{12}$$ was 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.

Journal Articles

Polarized neutron scattering studies of the Kagom$'e$ lattice antiferromagnet KFe$$_3$$(OH)$$_6$$(SO$$_4$$)$$_2$$

Matan, K.*; Helton, J. S.*; Grohol, D.*; Nocera, D. G.*; Wakimoto, Shuichi; Kakurai, Kazuhisa; Lee, Y. S.*

Physica B; Condensed Matter, 404(17), p.2529 - 2531, 2009/09

https://doi.org/10.1016/j.physb.2009.06.053
 Times Cited Count：4 Percentile：19.97(Physics, Condensed Matter)

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