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Title: | Na 2 IrO 3 as a Novel Relativistic Mott Insulator with a 340-meV Gap |
Authors: | Singh, Yogesh |
Keywords: | Spin-orbit LDA Spectroscopy |
Issue Date: | 2013 |
Publisher: | American Physical Society |
Citation: | Physical Review Letters,109(26). |
Abstract: | We study Na 2 IrO 3 by angle-resolved photoemission spectroscopy, optics, and band structure calculations in the local-density approximation (LDA). The weak dispersion of the Ir 5 d - t 2 g manifold highlights the importance of structural distortions and spin-orbit (SO) coupling in driving the system closer to a Mott transition. We detect an insulating gap Δ gap ≃ 340 meV which, at variance with a Slater-type description, is already open at 300 K and does not show significant temperature dependence even across T N ≃ 15 K . An LDA analysis with the inclusion of SO and Coulomb repulsion U reveals that, while the prodromes of an underlying insulating state are already found in LDA + SO , the correct gap magnitude can only be reproduced by LDA + SO + U , with U = 3 eV . This establishes Na 2 IrO 3 as a novel type of Mott-like correlated insulator in which Coulomb and relativistic effects have to be treated on an equal footing. |
Description: | Only IISERM authors are available in the record. |
URI: | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.109.266406 http://hdl.handle.net/123456789/3073 |
Appears in Collections: | Research Articles |
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