Magnetic order and spin excitations in the Kitaev-Heisenberg model on a honeycomb lattice
Vladimirov A.A., Ihle D., Plakida N.M.

Received: December 24, 2015

DOI: 10.7868/S0044451016060122

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We consider the quasi-two-dimensional pseudo-spin-1/2 Kitaev-Heisenberg model proposed for A₂IrO₃ (A = Li, Na) compounds. The spin-wave excitation spectrum, the sublattice magnetization, and the transition temperatures are calculated in the random phase approximation for four different ordered phases observed in the parameter space of the model: antiferomagnetic, stripe, ferromagnetic, and zigzag phases. The Néel temperature and temperature dependence of the sublattice magnetization are compared with the experimental data on Na₂IrO₃.