Resonant X-Ray Scattering and the jeff=1/2 Electronic Ground State in Iridate Perovskites

M. Moretti Sala, S. Boseggia, Desmond Francis McMorrow, G. Monaco

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Abstract

The resonant x-ray scattering (magnetic elastic, RXMS, and inelastic, RIXS) of Ir4+ at the L-2,L-3 edges relevant to spin-orbit Mott insulators A(n+1) Ir(n)O3(n+1) (A = Sr, Ba, etc.) are calculated using a single-ion model which treats the spin-orbit and tetragonal crystal-field terms on an equal footing. Both RXMS and RIXS in the spin-flip channel are found to display a nontrivial dependence on the direction of the magnetic moment, mu. Crucially, we show that for mu in the ab plane, RXMS in the cross-polarized channel at the L-2 edge is zero irrespective of the tetragonal crystal field; spin-flip RIXS, relevant to measurements of magnons, behaves reciprocally, being zero at L-2 when mu is perpendicular to the ab plane. Our results have important implications for the assignment of a j(eff) = 1/2 ground state on the basis of resonant x-ray experiments.
Original languageEnglish
Article number026403
JournalPhysical Review Letters
Volume112
Issue number2
Number of pages5
ISSN0031-9007
DOIs
Publication statusPublished - 2014

Keywords

  • Ground state
  • Magnetic moments
  • Scattering
  • Single crystals
  • X ray scattering
  • Cross-polarized
  • Electronic ground state
  • Measurements of
  • Mott insulators
  • Non-trivial dependence
  • Resonant X-ray scattering
  • Single-ion models
  • Tetragonal crystals
  • X rays
  • cond-mat.str-el

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