<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Na</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>IrO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>as a Novel Relativistic Mott Insulator with a 340-meV Gap
Why this work is in the frame
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Bibliographic record
Abstract
We study ${\mathrm{Na}}_{2}{\mathrm{IrO}}_{3}$ by angle-resolved photoemission spectroscopy, optics, and band structure calculations in the local-density approximation (LDA). The weak dispersion of the Ir $5d$-${t}_{2g}$ 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 ${\ensuremath{\Delta}}_{\mathrm{gap}}\ensuremath{\simeq}340\text{ }\text{ }\mathrm{meV}$ which, at variance with a Slater-type description, is already open at 300 K and does not show significant temperature dependence even across ${T}_{N}\ensuremath{\simeq}15\text{ }\text{ }\mathrm{K}$. 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 $\mathrm{LDA}+\mathrm{SO}$, the correct gap magnitude can only be reproduced by $\mathrm{LDA}+\mathrm{SO}+U$, with $U=3\text{ }\text{ }\mathrm{eV}$. This establishes ${\mathrm{Na}}_{2}{\mathrm{IrO}}_{3}$ as a novel type of Mott-like correlated insulator in which Coulomb and relativistic effects have to be treated on an equal footing.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.003 |
| Meta-epidemiology (broad) | 0.001 | 0.003 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.001 | 0.003 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.033 | 0.007 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it