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Evidence for a phase transition in the quantum spin liquid state of a Kitaev candidate α-RuCl3

祥大 末次, S. Suetsugu, 柚希 鵜飼, Yuzuki Ukai, 真輝 下邨, Shimomura, Masaki, 真志 神村, Masashi Kamimura, 智也 浅場, Tomoya Asaba, 裕一 笠原, Y. Kasahara, 伸之 栗田, Nobuyuki Kurita, 秀数 田中, HIDEKAZU TANAKA, 孝禎 芝内, T. Shibauchi, 譲治 那須, 幸年 求, Yukitoshi Motome, 祐司 松田, Y. Matsuda

Published Nov 1, 2022• 0 citations
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Inelastic neutron scattering evidence for Kitaev quantum spin liquid physics in $\alpha$-RuCl$_{3}$

S. E. Nagler

Bulletin of the American Physical Society•Mar 15, 2016•0 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 first polarized inelastic neutron scattering study on α-RuCl3 single crystals to explore the scattering continuum around the Γ point at the Brillouin zone center, which was hypothesized to be resulting from the Kitaev QSL state but without concrete evidence. With polarization analyses, we find that, while the spin-wave excitations around the M point vanish above the transition temperature T N, the pure magnetic continuous excitations around the Γ point are robust against temperature. Furthermore, by calculating the dynamical spin-spin correlation function using the cluster perturbation theory, we derive magnetic dispersion spectra based on the K–Γ model, which involves with a ferromagnetic Kitaev interaction of –7.2 meV and an off-diagonal interaction of 5.6 meV. We find this model can reproduce not only the spin-wave excitation spectra around the M point, but also the non-spin-wave continuous magnetic excitations around the Γ point. These results provide evidence for the existence of fractional excitations around the Γ point originating from the Kitaev QSL state, and further support the validity of the K–Γ model as the effective minimal spin model to describe α-RuCl3.
Abstract The spin liquid phase is one of the prominent strongly interacting topological phases of matter whose unambiguous confirmation is yet to be reached despite intensive experimental efforts on numerous candidate materials. Recently, a new family of correlated honeycomb materials, in which strong spin-orbit coupling allows for various bond-dependent spin interactions, have been promising candidates to realize the Kitaev spin liquid. Here we study a model with bond-dependent spin interactions and show numerical evidence for the existence of an extended quantum spin liquid region, which is possibly connected to the Kitaev spin liquid state. These results are used to provide an explanation of the scattering continuum seen in neutron scattering on α-RuCl3.
Inelastic neutron scattering evidence for Kitaev quantum spin liquid physics in α\alphaα-RuCl3_{3}3​