Oxygen Isotope Effect in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>a</mml:mi><mml:mi>b</mml:mi></mml:math>-Plane Reflectance of Underdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Y</mml:mi><mml:mi mathvariant="normal">B</mml:mi><mml:msub><mml:mi mathvariant="normal">a</mml:mi><mml:mn mathvariant="normal">2</mml:mn></mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:msub><mml:mi mathvariant="normal">u</mml:mi><mml:mn mathvariant="normal">3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn mathvariant="normal">7</mml:mn><mml:mo mathvariant="normal">−</mml:mo><mml:mi mathvariant="normal">δ</mml:mi></mml:mrow></mml:msub></mml:math>
Bibliographic record
Abstract
We have measured the effect of oxygen isotope substitution on the $ab$-plane reflectance of underdoped $\mathrm{Y}\mathrm{B}{\mathrm{a}}_{\mathrm{2}}\mathrm{C}{\mathrm{u}}_{\mathrm{3}}{\mathrm{O}}_{\mathrm{7}\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$. The frequency shift of the transverse optic phonons due to the substitution of $^{\mathrm{16}}\mathrm{O}$ by $^{\mathrm{18}}\mathrm{O}$ yields an isotope effect of the expected magnitude for copper-oxygen stretching modes with $\ensuremath{\alpha}=0.5\ifmmode\pm\else\textpm\fi{}0.1$. The reflectance shoulder at $400--500\text{ }\mathrm{c}{\mathrm{m}}^{\mathrm{\ensuremath{-}}\mathrm{1}}$ shows a much smaller exponent of $\ensuremath{\alpha}=0.1\ifmmode\pm\else\textpm\fi{}0.1$ in the normal state and $\ensuremath{\alpha}=0.23\ifmmode\pm\else\textpm\fi{}0.1$ in the superconducting state. These observations suggest that the shoulder is of electronic origin and not due to a phonon mode as has been suggested recently.
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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 | 0.012 | 0.004 |
| Meta-epidemiology (narrow) | 0.006 | 0.012 |
| Meta-epidemiology (broad) | 0.003 | 0.010 |
| Bibliometrics | 0.003 | 0.008 |
| Science and technology studies | 0.009 | 0.008 |
| Scholarly communication | 0.009 | 0.013 |
| Open science | 0.014 | 0.011 |
| Research integrity | 0.009 | 0.012 |
| Insufficient payload (model declined to judge) | 0.528 | 0.015 |
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".