ZhETF, Vol. 149,
p. 1222 (June 2016)
(English translation - JETP,
Vol. 122, No. 6,
available online at www.springer.com
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
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.