Evidence for Magnetic Fractional Excitations in a Kitaev Quantum-Spin-Liquid Candidate alpha-RuCl3
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10439369" target="_blank" >RIV/00216208:11320/22:10439369 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=L9dH597-ec" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=L9dH597-ec</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/0256-307X/39/2/027501" target="_blank" >10.1088/0256-307X/39/2/027501</a>
Alternative languages
Result language
angličtina
Original language name
Evidence for Magnetic Fractional Excitations in a Kitaev Quantum-Spin-Liquid Candidate alpha-RuCl3
Original language description
It is known that alpha-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 alpha-RuCl3 single crystals to explore the scattering continuum around the Gamma 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 Gamma 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-Gamma 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 Gamma point. These results provide evidence for the existence of fractional excitations around the Gamma point originating from the Kitaev QSL state, and further support the validity of the K-Gamma model as the effective minimal spin model to describe alpha-RuCl3.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Chinese Physics Letters
ISSN
0256-307X
e-ISSN
1741-3540
Volume of the periodical
39
Issue of the periodical within the volume
2
Country of publishing house
GB - UNITED KINGDOM
Number of pages
6
Pages from-to
027501
UT code for WoS article
000752027200001
EID of the result in the Scopus database
2-s2.0-85125754438