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The magnetic structure and electronic groundstate of the layered perovskiteBa2IrO4 have been investigated using x-ray resonant magnetic scattering (XRMS).Our results are compared with those for Sr2IrO4, for which we providesupplementary data on its magnetic structure. We find that the dominant,long-range antiferromagnetic order is remarkably similar in the two compounds,and that the electronic groundstate in Ba2IrO4, deduced from an investigationof the XRMS $L_3/L_2$ intensity ratio, is consistent with a $J_{eff}=1/2$description. The robustness of these two key electronic properties to theconsiderable structural differences between the Ba and Sr analogues isdiscussed in terms of the enhanced role of the spin-orbit interaction in 5dtransition metal oxides.

Robustness of basal-plane antiferromagnetic order and the $J_{eff}=1/2$ state in single-layer iridate spin-orbit Mott insulators