Magnetic excitations in the square-lattice iridate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>IrO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
We report a resonant inelastic x-ray scattering investigation of ultrathin epitaxial films of ${\mathrm{Ba}}_{2}{\mathrm{IrO}}_{4}$, and compare their low-energy magnetic and spin-orbit excitations to those of their sister compound ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$. Due to the ${180}^{\ensuremath{\circ}}$ Ir-O-Ir bond, the bandwidth of the magnon and spin orbiton is significantly larger in ${\mathrm{Ba}}_{2}{\mathrm{IrO}}_{4}$, making it difficult to describe these two types of excitations as separate well-defined quasiparticles. Both types of excitations are found to be quite sensitive to the effect of epitaxial strain. In addition, we find that the $d$-level inversion observed in ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$ is absent in ${\mathrm{Ba}}_{2}{\mathrm{IrO}}_{4}$, as predicted in recent theoretical studies. Our results illustrate that the magnetic properties of ${\mathrm{Ba}}_{2}{\mathrm{IrO}}_{4}$ are substantially different from those of ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$, suggesting that these materials need to be examined more carefully with electron itinerancy taken into account.
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How this classification was reachedexpand
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 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.003 |
| Meta-epidemiology (broad) | 0.001 | 0.004 |
| Bibliometrics | 0.000 | 0.004 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.004 | 0.003 |
| Research integrity | 0.001 | 0.004 |
| Insufficient payload (model declined to judge) | 0.169 | 0.014 |
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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".