Magnetic excitations in the double-perovskite iridates <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>M</mml:mi><mml:msub><mml:mi>IrO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow><mml:mo> </mml:mo><mml:mo>(</mml:mo><mml:mi>M</mml:mi><mml:mo>=</mml:mo><mml:mi>Co</mml:mi><mml:mo>,</mml:mo><mml:mi>Ni</mml:mi><mml:mo>,</mml:mo><mml:mspace width="0.28em"/><mml:mtext>and</mml:mtext><mml:mspace width="0.28em"/><mml:mi>Zn</mml:mi><mml:mo>)</mml:mo></mml:math> mediated by <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>3</mml:mn><mml:mi>d</mml:mi><mml:mtext>−</mml:mtext><mml:mn>5</mml:mn><mml:mi>d</mml:mi></mml:mrow></mml:math> hybridization
Bibliographic record
Abstract
By performing resonant inelastic x-ray scattering (RIXS) measurements at the Ir ${\mathit{L}}_{3}$ edge, we have investigated the low-energy elementary excitations in a series of double-perovskite iridate single crystals, ${\mathrm{La}}_{2}\mathit{M}{\mathrm{IrO}}_{6} (\mathit{M}=\mathrm{Co},\mathrm{Ni},\phantom{\rule{0.28em}{0ex}}\text{and}\phantom{\rule{0.28em}{0ex}}\mathrm{Zn})$. Almost dispersionless magnetic excitations at $\ensuremath{\sim}42(6)$ meV and $\ensuremath{\sim}35$(5) meV have been observed in crystals containing magnetic $3\mathit{d}$ ions, ${\mathrm{La}}_{2}{\mathrm{CoIrO}}_{6}$ and ${\mathrm{La}}_{2}{\mathrm{NiIrO}}_{6}$, respectively. In contrast, this low-energy magnetic excitation is absent in ${\mathrm{La}}_{2}{\mathrm{ZnIrO}}_{6}$ in which the $3\mathit{d}$ ions are nonmagnetic, suggesting the importance of $3\mathit{d}\ensuremath{-}5\mathit{d}$ hybridization in the magnetic properties of these double-perovskite iridates. The magnetic excitation is suppressed completely above the magnetic ordering temperature, suggesting the inadequacy of using a simple spin Hamiltonian to describe magnetism of these materials.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.021 | 0.001 |
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; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
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".