@article{discovery10134049,
       publisher = {AMER PHYSICAL SOC},
          volume = {110},
           month = {March},
            note = {This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.},
         journal = {Physical Review Letters},
          number = {11},
            year = {2013},
           title = {Robustness of Basal-Plane Antiferromagnetic Order and the J(eff)=1/2 State in Single-Layer Iridate Spin-Orbit Mott Insulators},
          author = {Boseggia, S and Springell, R and Walker, HC and Ronnow, HM and Rueegg, C and Okabe, H and Isobe, M and Perry, RS and Collins, SP and McMorrow, DF},
        abstract = {The magnetic structure and electronic ground state of the layered perovskite 
Ba
2
IrO
4
 have been investigated using x-ray resonant magnetic scattering. Our results are compared with those for 
Sr
2
IrO
4
, for which we provide supplementary 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 ground state in 
Ba
2
IrO
4
, deduced from an investigation of the x-ray resonant magnetic scattering 
L
3
/
L
2
 intensity ratio, is consistent with a 
J
eff
=
1
/
2
 description. The robustness of these two key electronic properties to the considerable structural differences between the Ba and Sr analogues is discussed in terms of the enhanced role of the spin-orbit interaction in 
5
d
 transition metal oxides.},
             url = {https://doi.org/10.1103/PhysRevLett.110.117207}
}