TY - JOUR A1 - Razpopov, Aleksandar A1 - Kaib, David Andreas Songzi A1 - Backes, Steffen A1 - Balents, Leon A1 - Wilson, Stephen D. A1 - Ferrari, Francesco A1 - Riedl, Kira Marina A1 - Valentí, Roser T1 - A jeff = 1/2 Kitaev material on the triangular lattice: the case of NaRuO2 T2 - npj Quantum Materials N2 - Motivated by recent reports of a quantum-disordered ground state in the triangular lattice compound NaRuO2, we derive a jeff = 1/2 magnetic model for this system by means of first-principles calculations. The pseudospin Hamiltonian is dominated by bond-dependent off-diagonal Γ interactions, complemented by a ferromagnetic Heisenberg exchange and a notably antiferromagnetic Kitaev term. In addition to bilinear interactions, we find a sizable four-spin ring exchange contribution with a strongly anisotropic character, which has been so far overlooked when modeling Kitaev materials. The analysis of the magnetic model, based on the minimization of the classical energy and exact diagonalization of the quantum Hamiltonian, points toward the existence of a rather robust easy-plane ferromagnetic order, which cannot be easily destabilized by physically relevant perturbations. Y1 - 2023 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/81963 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-819631 SN - 2397-4648 VL - 8 IS - 36 PB - Nature Publishing Group CY - [London] ER -