Magnetic and spin-orbit exciton excitations in the honeycomb lattice compound RuBr3
- Authors
- Choi, Youngsu; Lee, Je-Ho; Lee, Seungyeol; Wulferding, Dirk; Fujihara, Hideyuki; Sato, Fuki; Imai, Yoshinori; Ohgushi, Kenya; Seong, Maeng-Je; Choi, Kwang-Yong
- Issue Date
- Nov-2022
- Publisher
- American Physical Society
- Citation
- Physical Review B, v.106, no.17
- Journal Title
- Physical Review B
- Volume
- 106
- Number
- 17
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/60542
- DOI
- 10.1103/PhysRevB.106.174430
- ISSN
- 2469-9950
2469-9969
- Abstract
- RuX3 trihalides (X=halogen atoms) offer a prominent platform for exploring the Kitaev spin liquid. Using polarization-resolved Raman spectroscopy, we report a comparative study of lattice, magnetic, and electronic excitations on X=Cl and Br. Our phonon Raman spectra show that RuBr3 retains a three-layer honeycomb lattice without structural transition, unlike ?-RuCl3 that undergoes a monoclinic-to-rhombohedral structural transition at ?150K. In addition, both RuX3 compounds commonly feature single and double spin-orbit excitons of almost identical energies, alluding to the realization of a jeff=1/2 state to the same degree. In contrast to ?-RuCl3 two-magnon scattering dominates over fractionalized excitations in RuBr3. Our results suggest that a Br-for-Cl substitution moves RuX3 further away from a pure Kitaev phase despite enhanced p-d hybridization. © 2022 American Physical Society.
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