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We study the exchange interactions and resulting magnetic phases in thehoneycomb cobaltates. For a broad range of trigonal crystal fields acting onCo2+ ions, the low-energy pseudospin-1/2 Hamiltonian is dominated bybond-dependent Ising couplings that constitute the Kitaev model. The non-Kitaevterms nearly vanish at small values of trigonal field \Delta, resulting in spinliquid ground state. Considering Na3Co2SbO6 as an example, we find that thiscompound is proximate to a Kitaev spin liquid phase, and can be driven into itby slightly reducing \Delta by \sim 20 meV, e.g., via strain or pressurecontrol. We argue that due to the more localized nature of the magneticelectrons in 3d compounds, cobaltates offer the most promising search area forKitaev model physics.

Kitaev Spin Liquid in 3d Transition Metal Compounds