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We present genuine bulk Ir 5d jeff states of layered perovskite iridatesobtained by hard-x-ray photoemission spectroscopy (HAXPES) with s- andp-polarized lights. HAXPES spectra of Sr2IrO4 and Ba2IrO4 are well reproducedby the quasi-particle densities of states calculated by the local densityapproximation with dynamical mean-field theory (LDA+DMFT). It is demonstratedthat the insulating nature of the iridates is triggered by antiferromagneticcorrelation (Slater type) combined with electron correlation (Mott type). Theextremely-low-energy bulk-sensitive photoemission spectroscopy reveals "badmetallic" states in the paramagnetic phase of the iridates, suggesting stronglyrenormalized metallic states above the Neel temperature as predicted by theLDA+DMFT.

Bulk Nature of Layered Perovskite Iridates beyond the Mott Scenario : An Approach from Bulk Sensitive Photoemission Study