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arXiv · 1312.6264

Antiferromagnetic Slater Insulator Phase of Na2IrO3

Hyun-Jung Kim·Jun-Ho Lee·Jun-Hyung Cho
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Abstract

Using a hybrid density-functional theory (DFT) calculation including spin-orbit coupling (SOC), we predict that the zigzag antiferromagnetic (AFM) ground state of the honeycomb layered compound Na2IrO3 opens the observed insulating gap through a long-range magnetic order. We show that the effect of SOC and the correction of self-interaction error inherent in previous local or semilocal DFT calculations play crucial roles in predicting the band gap formation in Na2IrO3. It is revealed that the itinerant AFM order with a strong suppression of the Ir magnetic moment is attributed to a considerable hybridization of the Ir 5d orbitals with the O 2p orbitals. Thus, our results suggest that the insulating phase of Na2IrO3 can be represented as a Slater insulator driven by itinerant magnetism.

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Hyun-Jung Kim, Jun-Ho Lee, Jun-Hyung Cho. 2014-05-05. Antiferromagnetic Slater Insulator Phase of Na2IrO3. https://doi.org/10.1038/srep05253

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