Magnetism and spin-orbit coupling in Ir-based double perovskites La_{2−x}Sr_{x}CoIrO_{6}
- Kolchinskaya, A.
- Komissinskiy, P.
- Yazdi, M. Baghaie
- Vafaee, M.
- Mikhailova, D.
- Narayanan, N.
- Ehrenberg, H.
- Wilhelm, F.
- Rogalev, A.
- Alff, L.
DOIAbstract
We have studied Ir spin and orbital magnetic moments in the double perovskites La2−xSrxCoIrO6 by x-ray magnetic circular dichroism. In La2CoIrO6, Ir4+ couples antiferromagnetically to the weak ferromagnetic moment of the canted Co2+ sublattice and shows an unusually large negative total magnetic moment (−0.38 μB/f.u.) combined with strong spin-orbit interaction. In contrast, in Sr2CoIrO6, Ir5+ has a paramagnetic moment with almost no orbital contribution. A simple kinetic-energy-driven mechanism including spin-orbit coupling explains why Ir is susceptible to the induction of substantial magnetic moments in the double perovskite structure
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