CaIrO3: a Spin-Orbit Mott Insulator Beyond the jeff = 1/2 Ground State

Abstract

In CaIrO3 electronic correlation, spin-orbit coupling, and tetragonal crystal field splitting are predicted to be of comparable strength. However, the nature of its ground state is still object of debate, with contradictory experimental and theoretical results. We probe the ground state of CaIrO3 and assess the effective tetragonal crystal field splitting and spin-orbit coupling at play in this system by means of resonant inelastic x-ray scattering. We conclude that insulating CaIrO3 is not a jeff = 1/2 iridate and discuss the consequences of our finding to the interpretation of previous experiments. In particular, we clarify how the Mott insulating state in iridates can be readily extended beyond the jeff = 1/2 ground state.

5 pages, 4 figures

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• Theoretical Understanding of Photon Spectroscopies in Correlated Materials In and Out of Equilibrium
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• Mechanism of basal-plane antiferromagnetism in the spin-orbit driven iridate Ba2IrO4
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• Spin-orbit coupled systems in the "atomic" limit: rhenates, osmates, iridates
• Influence of structural distortions on the Ir magnetism in Ba2-xSrxYIrO6 double perovskites
• Hopping induced ground-state magnetism in 6H perovskite iridates
• $J_{eff}=1/2$ Mott Insulating State in Rh and Ir Fluorides
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• Interplay of the Jahn--Teller Effect and Spin-Orbit Coupling: The Case of Trigonal Vibronic Modes
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• Substrate-tuning of correlated spin-orbit oxides
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• Direct detection of dimer orbitals in Ba${}_5$AlIr${}_2$O${}_{11}$
• Orbital ordering of Ir-t2g states in the double perovskite Sr2CeIrO6
• Toward cubic symmetry for Ir${}^{4+}$: structure and magnetism of antifluorite K${}_2$IrBr${}_6$
• A new material for probing spin-orbit coupling in Iridates
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• Possibility to realize spin-orbit-induced correlated physics in iridium fluorides
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• High-pressure insulator-to-metal transition in Sr${}_3$Ir${}_2$O${}_7$ studied by x-ray absorption spectroscopy
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• Resonant inelastic x-ray scattering on single-magnons at oxygen $K$-edges
• Mott insulator-to-metal transition in yttrium-doped CaIrO3
• Anisotropic antiferromagnetic order in spin-orbit coupled trigonal lattice Ca2Sr2IrO6
• Spin-orbital-lattice entanglement in the ideal j=1/2 compound K${}_2$IrCl${}_6$
• Selective probing of magnetic order on Tb and Ir sites in stuffed Tb${}_{2+x}$Ir${}_{2-x}$O${}_{7-y}$ using resonant X-ray scattering
• Novel Block Excitonic Condensate at $n=3.5$ in a Spin-Orbit Coupled $t_{2g}$ Multiorbital Hubbard Model
• A $j_{\mathrm{eff}}=1/2$ pseudospinon continuum in CaIrO${}_3$
• Quantum magnetic properties and metal-to-insulator transition in chemically doped calcium ruthenate perovskite
• Coexistence of insulator-like paramagnon and metallic spin-orbit exciton modes in SrIrO${}_3$