Theoretical Model for Optical Spectrum and Structural Dynamics of La2-xSrxCuO4
Bibliographic record
Abstract
Superconductivity in cuprates cannot be fully understood using free-electron theory and the BCS model. Experiments during the last thirty years have shown that structural dynamics and localization cannot be ignored. The Marcus model is applied here for a theoretical assignment of the optical spectra. Hubbard-U absorption at »2 eV is assigned as metal/metal (MM) charge transfer transition of type 2Cu(II) + hn ® Cu(I) + Cu(III). The mid-infrared (MIR) sharp line at 0.35 eV in La2CuO4 is interpreted as a vibrational transition with intensity borrowing from the crossing Cu(I) + Cu(III) energy curve. Hole-doping decreases U, since holes become available as acceptors. The relationship between the pseudogap and U in the doped cuprate is discussed. The absorption at 0.13 eV and the activation energy at 0.035 eV, existing only after doping, are very likely due to vertical and adiabatic electron exchange of type Cu(III)+Cu(II)® Cu(II)+Cu(III). The pseudogap involves two-electron states.
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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 | 0.000 | 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 | 0.001 |
| 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".