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The nature of the electronic groundstate of Ba2IrO4 has been addressed usingsoft X-ray absorption and inelastic scattering techniques in the vicinity ofthe oxygen K edge. From the polarization and angular dependence of XAS wededuce an approximately equal superposition of xy, yz and zx Ir4+ 5d orbitals.By combining the measured orbital occupancies, with the value of the spin-orbitcoupling provided by RIXS, we estimate the crystal field splitting associatedwith the tetragonal distortion of the IrO6 octahedra to be small, \Delta=50(50)meV. We thus conclude definitively that Ba2IrO4 is a close realization of aspin-orbit Mott insulator with a jeff = 1/2 groundstate, thereby overcomingambiguities in this assignment associated with the interpretation of X-rayresonant scattering experiments.

Orbital occupancies and the putative jeff = 1/2 groundstate in Ba2IrO4: a combined oxygen K edge XAS and RIXS study