The J_{eff}=1/2 insulator Sr3Ir2O7 studied by means of angle-resolved   photoemission spectroscopy
  The low-energy electronic structure of the J_{eff}=1/2 spin-orbit insulator Sr3Ir2O7 has been studied by means of angle-resolved photoemission spectroscopy. A comparison of the results for bilayer Sr3Ir2O7 with available literature data for the related single-layer compound Sr2IrO4 reveals qualitative similarities and similar J_{eff}=1/2 bandwidths for the two materials, but also pronounced differences in the distribution of the spectral weight. In particuar, photoemission from the J_{eff}=1/2 states appears to be suppressed. Yet, it is found that the Sr3Ir2O7 data are in overall better agreement with band-structure calculations than the data for Sr2IrO4. 
B. M. Wojek and M. H. Berntsen and S. Boseggia and A. T. Boothroyd and   D. Prabhakaran and D. F. McMorrow and H. M. R{\o}nn...
cond-mat.str-el