Abstract
We present genuine bulk Ir states of layered perovskite iridates obtained by hard-x-ray photoemission spectroscopy (HAXPES) with - and -polarized lights. HAXPES spectra of SrIrO and BaIrO are well reproduced by the quasiparticle density of states calculated by the local density approximation with dynamical mean-field theory (). It is demonstrated that the insulating nature of the iridates is triggered by antiferromagnetic correlation (Slater type) combined with electron correlation (Mott type). The extremely-low-energy bulk-sensitive photoemission spectroscopy reveals “bad metallic” states in the paramagnetic phase of the iridates, suggesting strongly renormalized metallic states above the Néel temperature as predicted by the .
- Received 27 October 2013
- Revised 2 March 2014
DOI:https://doi.org/10.1103/PhysRevB.89.121111
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