Raman spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ru</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>: Phonon line assignment and electron scattering
Bibliographic record
Abstract
The polarized Raman spectra of layered ruthenate ${\mathrm{Ca}}_{3}{\mathrm{Ru}}_{2}{\mathrm{O}}_{7}$ were measured between 5 and $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ in several exact scattering configurations. All observed Raman lines were assigned to definite phonon modes of ${A}_{1}$ or ${A}_{2}$ symmetry on the basis of their polarization properties and by comparison to the results of lattice dynamical calculations for the orthorhombic $A{2}_{1}ma$ structure. It is established that the Fano-shaped ${A}_{2}$ mode, which exhibits a strong anomaly near the metal-nonmetal transition at ${T}_{M}=48\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, involves mainly in-plane breathing-type oxygen vibrations. Other ${A}_{2}$ modes also exhibit detectable anomalies near ${T}_{M}$. We argue that the phonon softening below ${T}_{M}$ is largely due to the orbital ordering and related structural changes.
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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 | 0.004 | 0.001 |
| Meta-epidemiology (narrow) | 0.003 | 0.005 |
| Meta-epidemiology (broad) | 0.001 | 0.005 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.003 | 0.003 |
| Scholarly communication | 0.003 | 0.004 |
| Open science | 0.005 | 0.005 |
| Research integrity | 0.003 | 0.005 |
| Insufficient payload (model declined to judge) | 0.482 | 0.006 |
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".