Electronic polarons and bipolarons in iron-based superconductors: The role of anions
Bibliographic record
Abstract
We introduce a quantum-mechanical model to describe the low-energy scale electronic structure of the Fe-based pnictides, placing a special importance on the large polarizability of the large anions, such as ${\text{As}}^{3\ensuremath{-}}$. These are modeled in terms of an atomic two-level system coupled strongly to charge fluctuations on the nearby Fe ions. This strong coupling results in electronic polaron formation, a strong effective reduction in the Fe on-site Coulomb repulsion, and the appearance of a strong attractive interaction for $d$ electrons on nearest-neighbor Fe sites, which could be an essential component of the pairing mechanism. This quantum model allows us to investigate this phenomenology away from the linear regime and to also study the dynamic properties of these polarons, as well as the binding of polaron pairs and their dynamics.
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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 | 0.001 | 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) | 0.000 | 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 teacher head, 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".