AI Article Synopsis
- The study explores the electronic structure of honeycomb lattice iridates Na(2)IrO(3) and Li(2)IrO(3) using resonant inelastic x-ray scattering (RIXS), revealing detailed d-d excitations.
- The research highlights that the crystal-field splitting of j(eff)=3/2 states is notably smaller than the typical spin-orbit energy scale, supporting the application of j(eff) physics in these materials.
- It also notes an excitonic enhancement of the particle-hole excitation gap, suggesting significant nearest-neighbor Coulomb interactions, characterizing both compounds as spin-orbit Mott insulators similar to Sr(2)IrO(4).
Article Abstract
The electronic structure of the honeycomb lattice iridates Na(2)IrO(3) and Li(2)IrO(3) has been investigated using resonant inelastic x-ray scattering (RIXS). Crystal-field-split d-d excitations are resolved in the high-resolution RIXS spectra. In particular, the splitting due to noncubic crystal fields, derived from the splitting of j(eff)=3/2 states, is much smaller than the typical spin-orbit energy scale in iridates, validating the applicability of j(eff) physics in A(2)IrO(3). We also find excitonic enhancement of the particle-hole excitation gap around 0.4 eV, indicating that the nearest-neighbor Coulomb interaction could be large. These findings suggest that both Na(2)IrO(3) and Li(2)IrO(3) can be described as spin-orbit Mott insulators, similar to the square lattice iridate Sr(2)IrO(4).
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| http://dx.doi.org/10.1103/PhysRevLett.110.076402 | DOI Listing |
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