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  • Title: Resonant x-ray diffraction study of the strongly spin-orbit-coupled mott insulator CaIrO3.
    Author: Ohgushi K, Yamaura J, Ohsumi H, Sugimoto K, Takeshita S, Tokuda A, Takagi H, Takata M, Arima TH.
    Journal: Phys Rev Lett; 2013 May 24; 110(21):217212. PubMed ID: 23745928.
    Abstract:
    We performed resonant x-ray diffraction experiments at the L absorption edges for the post-perovskite-type compound CaIrO(3) 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 J(eff)=1/2 state. The observed spin arrangement is consistent with theoretical work predicting a unique superexchange interaction in the J(eff)=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.
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