Spectroscopic evidence for polaronic behaviour of the strong spin-orbit insulator Sr${}_3$Ir${}_2$O${}_7$

Abstract

We investigate the bilayer Ruddlesden-Popper iridate Sr${}_3$Ir${}_2$O${}_7$ by temperature-dependent angle-resolved photoemission. We find a narrow-gap correlated insulator, with spectral features indicative of a polaronic ground state, strikingly similar to that observed previously for the parent compounds of the cuprate superconductors. We additionally observe similar behaviour for the single-layer cousin Sr${}_2$IrO${}_4$, indicating that strong electron-boson coupling dominates the low-energy excitations of this exotic family of materials, and providing a microscopic link between the insulating ground states of the seemingly-disparate 3d cuprates and 5d iridates.

6 pages, 4 figures. A high resolution version is available at http://www.st-andrews.ac.uk/~pdk6/pub_files/Ir327_cond_mat_HiRes.pdf

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Cited by in corpus (33)

• Correlated quantum phenomena in the strong spin-orbit regime
• Interplay of Spin-Orbit Interactions, Dimensionality, and Octahedral Rotations in Semimetallic SrIrO${}_3$
• Electronic correlations and superconducting instability in La${}_3$Ni${}_2$O${}_7$ under high pressure
• Quadratic Fermi Node in a 3D Strongly Correlated Semimetal
• Effective J=1/2 insulating state in Ruddlesden-Popper iridates: An LDA+DMFT study
• Excitonic quasiparticles in a spin-orbit Mott insulator
• Slater to Mott crossover in the metal to insulator transition of Nd2Ir2O7
• Direct observation of the Dirac nodes lifting in semimetallic perovskite SrIrO3 thin films
• A charge density wave-like instability in a doped spin-orbit-assisted weak Mott insulator
• Spectroscopic evidence for negative electronic compressibility in a quasi-three-dimensional spin-orbit correlated metal
• Pressure-Induced Confined Metal from the Mott Insulator Sr3Ir2O7
• A weakly correlated Fermi liquid state with a small Fermi surface in lightly doped Sr${}_3$Ir${}_2$O${}_7$
• Dimensionality-strain phase diagram of strontium iridates
• Structural investigation of the bilayer iridate Sr3Ir2O7
• Phonon-assisted optical excitation in the narrow bandgap Mott insulator Sr3Ir2O7
• Correlated vs. conventional insulating behavior in the Jeff=1/2 vs. 3/2 bands in the layered iridate Ba2IrO4
• Properties of the non-linear Holstein polaron at finite doping and temperature
• Antiferromagnetic Excitonic Insulator State in Sr3Ir2O7
• Thermoelectric behavior of Ruddlesden-Popper series iridates
• Temperature-induced band selective localization and coherent-incoherent crossover in single-layer FeSe/Nb:BaTiO3 /KTaO3
• Magnetic properties of bilayer Sr${}_3$Ir${}_2$O${}_7$: role of epitaxial strain and oxygen vacancies
• Three-dimensional electronic structures and the metal-insulator transition in Ruddlesden-Popper iridates
• High-pressure insulator-to-metal transition in Sr${}_3$Ir${}_2$O${}_7$ studied by x-ray absorption spectroscopy
• Spin correlated electronic state on the surface of a spin-orbit Mott system (Layered Iridates)
• Quasiparticles and charge transfer at the two surfaces of the honeycomb iridate Na${}_2$IrO${}_3$
• Mott transition and collective charge pinning in electron doped Sr2IrO4
• Cooperative effects of lattice and spin-orbit coupling on the electronic structure of orthorhombic SrIrO3
• Coherent and incoherent bands in La and Rh doped Sr3Ir2O7
• Observation of excitons bound by antiferromagnetic correlations
• Electron doping in ${\text{Sr}}_3{\text{Ir}}_2{\text{O}}_7$: collapse of band gap and magnetic order
• Strain tunable electronic ground states in two-dimensional iridate thin films
• Evolution of the spectral lineshape at the magnetic transition in Sr2IrO4 and Sr3Ir2O7
• Fingerprints of Mott and Slater gaps in the core-level photoemission spectra of antiferromagnetic iridates