Kitaev Spin Liquid in 3d Transition Metal Compounds

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Authors

LIU Huimei CHALOUPKA Jiří KHALIULLIN Giniyat

Year of publication 2020
Type Article in Periodical
Magazine / Source Physical Review Letters
MU Faculty or unit

Faculty of Science

Citation
Web https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.125.047201
Doi http://dx.doi.org/10.1103/PhysRevLett.125.047201
Keywords Magnetic Properties; Kitaev model
Description We study the exchange interactions and resulting magnetic phases in the honeycomb cobaltates. For a broad range of trigonal crystal fields acting on Co2+ ions, the low-energy pseudospin-1/2 Hamiltonian is dominated by bond-dependent Ising couplings that constitute the Kitaev model. The non-Kitaev terms nearly vanish at small values of trigonal field Delta, resulting in spin liquid ground state. Considering Na3Co2SbO6 as an example, we find that this compound is proximate to a Kitaev spin liquid phase, and can be driven into it by slightly reducing Delta by similar to 20 meV, e.g., via strain or pressure control. We argue that, due to the more localized nature of the magnetic electrons in 3d compounds, cobaltates offer the most promising search area for Kitaev model physics.
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