Resonant X-ray diffraction study of the strongly spin-orbit-coupled mott insulator CaIrO3

Kenya Ohgushi, Jun Ichi Yamaura, Hiroyuki Ohsumi, Kunihisa Sugimoto, Soshi Takeshita, Akihisa Tokuda, Hidenori Takagi, Masaki Takata, Taka Hisa Arima

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

We performed resonant x-ray diffraction experiments at the L absorption edges for the post-perovskite-type compound CaIrO3 with a (t 2g)5 electronic configuration. By observing the magnetic signals, we could clearly see that the magnetic structure was a striped ordering with an antiferromagnetic moment along the c axis and that the wave function of a t 2g hole is strongly spin-orbit entangled, the Jeff=1/2 state. The observed spin arrangement is consistent with theoretical work predicting a unique superexchange interaction in the Jeff=1/2 state and points to the universal importance of the spin-orbit coupling in Ir oxides, independent of the octahedral connectivity and lattice topology. We also propose that nonmagnetic resonant scattering is a powerful tool for unraveling an orbital state even in a metallic iridate.

Original languageEnglish
Article number217212
JournalPhysical review letters
Volume110
Issue number21
DOIs
Publication statusPublished - 2013 May 24
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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