Crystal field splitting in Sr${}_{n+1}$Ir${}_n$O${}_{3n+1}$ ($n$ = 1, 2) iridates probed by x-ray Raman spectroscopy

Abstract

Non-resonant Raman spectroscopy in the hard X-ray regime has been used to explore the electronic structure of the first two members of the Ruddlesden-Popper series Sr${}_{n+1}$Ir${}_n$O${}_{3n+1}$ of iridates. By tuning the photon energy transfer around 530 eV we have been able to explore the oxygen K near edge structure with bulk sensitivity. The angular dependence of the spectra has been exploited to assign features in the 528-535 eV energy range to specific transitions involving the Ir 5d orbitals. This has allowed us to extract reliable values for both the t2g-eg splitting arising from the cubic component of the crystal field (10Dq), in addition to the splitting of the eg orbitals due to tetragonal distortions. The values we obtain are (3.8, 1.6) eV and (3.55, 1.9) eV for Sr${}_2$IrO${}_4$ and Sr${}_3$Ir${}_2$O${}_7$, respectively.

arXiv comment6 pages, 4 figures, 2 tables

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• Evidence of quantum dimer excitations in Sr${}_3$Ir${}_2$O${}_7$
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• Pressure dependence of the structure and electronic properties of Sr3Ir2O7
• Correlation induced electron-hole asymmetry in quasi-2D iridates
• Thermoelectric behavior of Ruddlesden-Popper series iridates
• Anisotropic interactions opposing magnetocrystalline anisotropy in Sr${}_3$NiIrO${}_6$
• High-pressure insulator-to-metal transition in Sr${}_3$Ir${}_2$O${}_7$ studied by x-ray absorption spectroscopy
• Possibility to realize spin-orbit-induced correlated physics in iridium fluorides
• Spin-lattice and electron-phonon coupling in 3$d$/5$d$ hybrid Sr${}_3$NiIrO${}_6$
• Multiband $d-p$ model and self-doping in the electronic structure of Ba${}_2$IrO${}_4$
• Precise control of $J_{\mathrm{eff}}=1/2$ magnetic properties in Sr${}_2$IrO${}_4$ epitaxial thin films by variation of strain and thin film thickness
• A $j_{\mathrm{eff}}=1/2$ pseudospinon continuum in CaIrO${}_3$