Magnetic and spin-orbit exciton excitations in the honeycomb lattice compound RuBr3

Youngsu Choi, Je Ho Lee, Seungyeol Lee, Dirk Wulferding, Hideyuki Fujihara, Fuki Sato, Yoshinori Imai, Kenya Ohgushi, Maeng Je Seong, Kwang Yong Choi

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number174430
JournalPhysical Review B
Issue number17
Publication statusPublished - 2022 Nov 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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