Anomalous Quasiparticle Renormalization in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Na</mml:mi><mml:mn>0.73</mml:mn></mml:msub><mml:msub><mml:mi>CoO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>: Role of Interorbital Interactions and Magnetic Correlations
Bibliographic record
Abstract
We report an angular resolved photoemission study of ${\mathrm{Na}}_{x}{\mathrm{CoO}}_{2}$ with $x\ensuremath{\simeq}0.73$ where it is found that the renormalization of the quasiparticle (QP) dispersion changes dramatically upon a rotation from $\ensuremath{\Gamma}\mathrm{M}$ to $\ensuremath{\Gamma}\mathrm{K}$. The comparison of the experimental data to the calculated band structure reveals that the quasiparticle renormalization is most pronounced along the $\ensuremath{\Gamma}\mathrm{K}$ direction, while it is significantly weaker along the $\ensuremath{\Gamma}\mathrm{M}$ direction. We discuss the observed anisotropy in terms of multiorbital effects and point out the relevance of magnetic correlations for the band structure of ${\mathrm{Na}}_{x}{\mathrm{CoO}}_{2}$ with $x\ensuremath{\simeq}0.75$.
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.000 |
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".