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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 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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.026 | 0.003 |
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".