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Bibliographic record
Abstract
In order to access the overdoped regime of the ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{y}$ phase diagram, 2% Ca is substituted for Y in ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{y}$ $(y=7.00,6.93,6.88,6.76).$ Raman scattering studies have been carried out on these four single crystals. Measurements of the superconductivity-induced renormalization in frequency $(\ensuremath{\Delta}\ensuremath{\omega})$ and linewidth $(\ensuremath{\Delta}2\ensuremath{\gamma})$ of the $340\ensuremath{-}{\mathrm{cm}}^{\ensuremath{-}1}$ ${B}_{1g}$ phonon demonstrate that the magnitude of the renormalization is directly related to the hole concentration p and not simply the oxygen content. The changes in $\ensuremath{\Delta}\ensuremath{\omega}$ with p imply that the superconducting gap $({\ensuremath{\Delta}}_{\mathrm{max}})$ decreases monotonically with increasing hole concentration in the overdoped regime, and $\ensuremath{\Delta}\ensuremath{\omega}$ falls to zero in the underdoped regime. The linewidth renormalization $\ensuremath{\Delta}2\ensuremath{\gamma}$ is negative in the underdoped regime, crossing over at optimal doping to a positive value in the overdoped state.
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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 | 0.014 | 0.012 |
| Meta-epidemiology (narrow) | 0.008 | 0.017 |
| Meta-epidemiology (broad) | 0.003 | 0.016 |
| Bibliometrics | 0.005 | 0.011 |
| Science and technology studies | 0.012 | 0.015 |
| Scholarly communication | 0.013 | 0.014 |
| Open science | 0.018 | 0.017 |
| Research integrity | 0.017 | 0.014 |
| Insufficient payload (model declined to judge) | 0.884 | 0.014 |
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".