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A relativistic spin-orbit coupling may drive unusual interactions and
orderings in Mott insulators [1,2]. This coupling entangles the spin and
orbital subspaces leading to a rich variety of effective Hamiltonians
depending on the lattice geometry and orbital structure. Particular examples
to be discussed are: (i)Iridium perovskite Sr2IrO4 with an anomalously
large spin canting; (ii)The recently synthesized honeycomb lattice Na2IrO3
where the celebrated Kitaev model might be at work.
[1] G. Jackeli, G. Khaliullin, PRL 102, 017205 (2009). [2] J. Chaloupka, G. Jackeli, G. Khaliullin, PRL 105, 027204 (2010). |
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