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

Abstract

We present genuine bulk Ir 5d jeff states of layered perovskite iridates obtained by hard-x-ray photoemission spectroscopy (HAXPES) with s- and p-polarized lights. HAXPES spectra of Sr2IrO4 and Ba2IrO4 are well reproduced by the quasi-particle densities of states calculated by the local density approximation with dynamical mean-field theory (LDA+DMFT). 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 Neel temperature as predicted by the LDA+DMFT.

5 pages, 3 figures

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• Theoretical study of insulating mechanism in multi-orbital Hubbard models with a large spin-orbit coupling: Slater versus Mott scenario in Sr${}_2$IrO${}_4$
• Novel spin-orbit coupling driven emergent states in iridate-based heterostructures
• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
• Non-local Coulomb correlations in pure and electron-doped ${\mathrm{Sr}}_2{\mathrm{IrO}}_4$: spectral functions, Fermi surface and pseudogap-like spectral weight distributions from oriented cluster dynamical mean field theory
• BaOsO${}_3$: A Hund's metal in the presence of strong spin-orbit coupling
• Charge transfer energy in iridates: a hard x-ray photoelectron spectroscopy study
• High-energy electronic excitations in Sr${}_2$IrO${}_4$ observed by Raman scattering
• Optical Signature of a Crossover from Mott- to Slater-type Gap in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$
• Magnetic-order-driven metal-insulator transitions in the quasi-one-dimensional spin-ladder compounds BaFe${}_2$S${}_3$ and BaFe${}_2$Se${}_3$
• Non-collinear vs collinear description of the Ir-based one-$t_{2g}$ -hole perovskite-related compounds: SrIrO${}_3$ and Sr${}_2$IrO${}_4$
• Evidence of Slater-type mechanism as origin of insulating state in Sr2IrO4
• Possible superconductivity induced by a large spin-orbit coupling in carrier doped iridium oxide insulators: A weak coupling approach
• Spin dynamics in NaFeAs and NaFe${}_{0.53}$Cu${}_{0.47}$As probed by resonant inelastic X-ray scattering
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