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

doi:10.1103/PhysRevB.106.174430

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

SCI - Physics

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	174430
Journal	Physical Review B
Volume	106
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.106.174430
Publication status	Published - 2022 Nov 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.106.174430

Cite this

@article{34b53951111541488c556a3a4aa8807e,

title = "Magnetic and spin-orbit exciton excitations in the honeycomb lattice compound RuBr3",

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.",

author = "Youngsu Choi and Lee, {Je Ho} and Seungyeol Lee and Dirk Wulferding and Hideyuki Fujihara and Fuki Sato and Yoshinori Imai and Kenya Ohgushi and Seong, {Maeng Je} and Choi, {Kwang Yong}",

note = "Funding Information: The work at SKKU was supported by the National Research Foundation (NRF) of Korea (Grants No. 2020R1A2C3012367, No. 2020K1A3A1A21041903, and No. 2020R1A5A1016518). The work at CAU was supported by NRF of Korea (Grants No. 2022R1A2C1003959 and No. 2020R1A5A1016518). D.W. acknowledges support from the Institute of Basic Science (IBS-R009-Y3). The work at Tohoku University is financially supported by JSPS KAKENHI (Grants No. JP19H05823, No. JP19H05822, No. JP20H01850, No. JP22H00102, No. JP22K18680, and No. JP22H01175) and JST CREST (Grant No. JP19198318) Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

year = "2022",

month = nov,

day = "1",

doi = "10.1103/PhysRevB.106.174430",

language = "English",

volume = "106",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "17",

}

TY - JOUR

T1 - Magnetic and spin-orbit exciton excitations in the honeycomb lattice compound RuBr3

AU - Choi, Youngsu

AU - Lee, Je Ho

AU - Lee, Seungyeol

AU - Wulferding, Dirk

AU - Fujihara, Hideyuki

AU - Sato, Fuki

AU - Imai, Yoshinori

AU - Ohgushi, Kenya

AU - Seong, Maeng Je

AU - Choi, Kwang Yong

N1 - Funding Information: The work at SKKU was supported by the National Research Foundation (NRF) of Korea (Grants No. 2020R1A2C3012367, No. 2020K1A3A1A21041903, and No. 2020R1A5A1016518). The work at CAU was supported by NRF of Korea (Grants No. 2022R1A2C1003959 and No. 2020R1A5A1016518). D.W. acknowledges support from the Institute of Basic Science (IBS-R009-Y3). The work at Tohoku University is financially supported by JSPS KAKENHI (Grants No. JP19H05823, No. JP19H05822, No. JP20H01850, No. JP22H00102, No. JP22K18680, and No. JP22H01175) and JST CREST (Grant No. JP19198318) Publisher Copyright: © 2022 American Physical Society.

PY - 2022/11/1

Y1 - 2022/11/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85143201110&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85143201110&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.106.174430

DO - 10.1103/PhysRevB.106.174430

M3 - Article

AN - SCOPUS:85143201110

SN - 2469-9950

VL - 106

JO - Physical Review B

JF - Physical Review B

IS - 17

M1 - 174430

ER -

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

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this