This title appears in the Scientific Report :
2022
Please use the identifier:
http://dx.doi.org/10.1088/0256-307X/39/2/027501 in citations.
Please use the identifier: http://hdl.handle.net/2128/30267 in citations.
Evidence for Magnetic Fractional Excitations in a Kitaev Quantum-Spin-Liquid Candidate α-RuCl3
Evidence for Magnetic Fractional Excitations in a Kitaev Quantum-Spin-Liquid Candidate α-RuCl3
It is known that 𝛼-RuCl3 has been studied extensively because of its proximity to the Kitaev quantum-spin-liquid(QSL) phase and the possibility of approaching it by tuning the competing interactions. Here we present the firstpolarized inelastic neutron scattering study on 𝛼-RuCl3 single crystals to...
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Personal Name(s): | Ran, Kejing |
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Wang, Jinghui / Bao, Song / Cai, Zhengwei / Shangguan, Yanyan / Ma, Zhen / Wang, Wei / Dong, Zhao-Yang / Cermak, P. / Schneidewind, A. / Meng, Siqin / Lu, Zhilun / Yu, Shun-Li / Li, Jian-Xin / Wen, Jinsheng (Corresponding author) | |
Contributing Institute: |
JARA-FIT; JARA-FIT Streumethoden; PGI-4 Heinz Maier-Leibnitz Zentrum; MLZ JCNS-4; JCNS-4 Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Chinese physics letters, 39 (2022) S. 027501 |
Imprint: |
Bristol
IOP Publ.
2022
|
DOI: |
10.1088/0256-307X/39/2/027501 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) (FZJ) Materials – Quantum, Complex and Functional Materials |
Subject (ZB): | |
Link: |
Restricted OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/30267 in citations.
It is known that 𝛼-RuCl3 has been studied extensively because of its proximity to the Kitaev quantum-spin-liquid(QSL) phase and the possibility of approaching it by tuning the competing interactions. Here we present the firstpolarized inelastic neutron scattering study on 𝛼-RuCl3 single crystals to explore the scattering continuum aroundthe 𝛤 point at the Brillouin zone center, which was hypothesized to be resulting from the Kitaev QSL state butwithout concrete evidence. With polarization analyses, we find that, while the spin-wave excitations around the𝑀 point vanish above the transition temperature 𝑇N, the pure magnetic continuous excitations around the 𝛤point are robust against temperature. Furthermore, by calculating the dynamical spin-spin correlation functionusing the cluster perturbation theory, we derive magnetic dispersion spectra based on the 𝐾–𝛤 model, whichinvolves with a ferromagnetic Kitaev interaction of −7.2meV and an off-diagonal interaction of 5.6 meV. We findthis model can reproduce not only the spin-wave excitation spectra around the 𝑀 point, but also the non-spinwavecontinuous magnetic excitations around the 𝛤 point. These results provide evidence for the existence offractional excitations around the 𝛤 point originating from the Kitaev QSL state, and further support the validityof the 𝐾–𝛤 model as the effective minimal spin model to describe 𝛼-RuCl3. |