Kitaev-Heisenberg-J2-J3model for the iridatesA2IrO3

摘要: A Kitaev-Heisenberg-${J}_{2}$-${J}_{3}$ model is proposed to describe the Mott-insulating layered iridates ${A}_{2}$IrO${}_{3}$ ($A=\text{Na}$, Li). The a combination of Kitaev honeycomb and Heisenberg with all three nearest-neighbor couplings ${J}_{1}$, ${J}_{2}$, ${J}_{3}$. rich phase diagram obtained at classical level, including experimentally suggested zigzag ordered phase; as well stripy phase, which extends from Kitaev-Heisenberg limit ${J}_{1}$-${J}_{2}$-${J}_{3}$ one. Combining observed spin order optimal fitting uniform magnetic susceptibility data gives an estimate possible parameter values, in turn reaffirms necessity both farther neighbor couplings.