Kitaev-Heisenberg-J2-J3 model for the iridates A2IrO3

Details Kitaev-Heisenberg-J2-J3 model for the iridates A2IrO3 Kitaev-Heisenberg-J2-J3 model for the iridates A2IrO3

2011-08-11

arxiv.org/abs/1108.2481v3

Phys. Rev. B 84, 180407(R) (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4+epsilon pages, 3 figures, 1 table. Published version

Scientific paper

10.1103/PhysRevB.84.180407

A Kitaev-Heisenberg-J2-J3 model is proposed to describe the Mott-insulating layered iridates A2IrO3 (A=Na,Li). The model is a combination of the Kitaev honeycomb model and the Heisenberg model with all three nearest neighbor couplings J1, J2 and J3. A rich phase diagram is obtained at the classical level, including the experimentally suggested zigzag ordered phase; as well as the stripy phase, which extends from the Kitaev-Heisenberg limit to the J1-J2-J3 one. Combining the experimentally observed spin order with the optimal fitting to the uniform magnetic susceptibility data gives an estimate of possible parameter values, which in turn reaffirms the necessity of including both the Kitaev and farther neighbor couplings.

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