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 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 | 0.011 | 0.009 |
| Meta-epidemiology (narrow) | 0.007 | 0.013 |
| Meta-epidemiology (broad) | 0.003 | 0.013 |
| Bibliometrics | 0.004 | 0.010 |
| Science and technology studies | 0.011 | 0.011 |
| Scholarly communication | 0.009 | 0.009 |
| Open science | 0.015 | 0.013 |
| Research integrity | 0.010 | 0.013 |
| Insufficient payload (model declined to judge) | 0.394 | 0.015 |
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".