Doping dependence of the superconducting gap in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ crystals with varying hole concentrations $(0.12<p<0.23)$ were studied to investigate the effects of doping on the symmetry and magnitude of the superconducting gap $[\ensuremath{\Delta}(\mathbf{k})].$ Electronic Raman scattering experiments that sample regions of the Fermi surface near the diagonal ${(B}_{2g})$ and principal axes ${(B}_{1g})$ of the Brillouin zone have been utilized. The frequency dependence of the Raman response function ${\ensuremath{\chi}}^{\ensuremath{''}}$ at low energies $[\ensuremath{\omega}<\ensuremath{\Delta}(\mathbf{k})]$ is found to be linear for ${B}_{2g}$ and cubic for ${B}_{1g}$ $(T<{T}_{c}).$ The latter observations have led us to conclude that the doping dependence of the superconducting gap is consistent with ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ symmetry, for slightly underdoped and overdoped crystals. Studies of the pair-breaking peak found in the ${B}_{1g}$ spectra demonstrate that the magnitude of the maximum gap $(|{\ensuremath{\Delta}}_{\mathrm{max}}|)$ decreases monotonically with increasing hole doping, for $p>0.12.$ Based on the magnitude of the ${B}_{1g}$ renormalization, it is found that the number of quasiparticles participating in pairing increases monotonically with increased doping. On the other hand, the ${B}_{2g}$ spectra show a weak ``pair-breaking peak'' that follows a paraboliclike dependence on hole concentration, for $0.12<p<0.23.$
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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 | 0.010 | 0.008 |
| Meta-epidemiology (narrow) | 0.005 | 0.012 |
| Meta-epidemiology (broad) | 0.002 | 0.012 |
| Bibliometrics | 0.004 | 0.008 |
| Science and technology studies | 0.008 | 0.011 |
| Scholarly communication | 0.009 | 0.012 |
| Open science | 0.014 | 0.013 |
| Research integrity | 0.011 | 0.011 |
| Insufficient payload (model declined to judge) | 0.990 | 0.013 |
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".