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Ran, Kejing [VerfasserIn]; Wang, Jinghui [VerfasserIn]; Meng, Siqin [VerfasserIn]; Lu, Zhilun [VerfasserIn]; Yu, Shun-Li [VerfasserIn]; Li, Jian-Xin [VerfasserIn]; Wen, Jinsheng [VerfasserIn]; Bao, Song [VerfasserIn]; Cai, Zhengwei [VerfasserIn]; Shangguan, Yanyan [VerfasserIn]; Ma, Zhen [VerfasserIn]; Wang, Wei [VerfasserIn]; Dong, Zhao-Yang [VerfasserIn]; Cermak, P. [VerfasserIn]; Schneidewind, A. [VerfasserIn]

Evidence for Magnetic Fractional Excitations in a Kitaev Quantum-Spin-Liquid Candidate α-RuCl3

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  • Medientyp: E-Artikel
  • Titel: Evidence for Magnetic Fractional Excitations in a Kitaev Quantum-Spin-Liquid Candidate α-RuCl3
  • Beteiligte: Ran, Kejing [VerfasserIn]; Wang, Jinghui [VerfasserIn]; Meng, Siqin [VerfasserIn]; Lu, Zhilun [VerfasserIn]; Yu, Shun-Li [VerfasserIn]; Li, Jian-Xin [VerfasserIn]; Wen, Jinsheng [VerfasserIn]; Bao, Song [VerfasserIn]; Cai, Zhengwei [VerfasserIn]; Shangguan, Yanyan [VerfasserIn]; Ma, Zhen [VerfasserIn]; Wang, Wei [VerfasserIn]; Dong, Zhao-Yang [VerfasserIn]; Cermak, P. [VerfasserIn]; Schneidewind, A. [VerfasserIn]
  • Erschienen: IOP Publ., 2022
  • Erschienen in: Chinese physics letters 39, 027501 (2022). doi:10.1088/0256-307X/39/2/027501
  • Sprache: Englisch
  • DOI: https://doi.org/10.1088/0256-307X/39/2/027501
  • ISSN: 0256-307X
  • Entstehung:
  • Anmerkungen: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Beschreibung: 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.
  • Zugangsstatus: Freier Zugang