Crystal-Field Splitting and Correlation Effect on the Electronic Structure ofA2IrO3 Academic Article uri icon

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  • 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).


  • Clancy, Pat
  • Gretarsson, H
  • Clancy, JP
  • Liu, X
  • Hill, JP
  • Bozin, Emil
  • Singh, Yogesh
  • Manni, S
  • Gegenwart, P
  • Kim, Jungho
  • Said, AH
  • Casa, D
  • Gog, T
  • Upton, MH
  • Kim, Heung-Sik
  • Yu, J
  • Katukuri, Vamshi M
  • Hozoi, L
  • van den Brink, Jeroen
  • Kim, Young-June

publication date

  • February 15, 2013