Doping dependence of the upper critical field of electron-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ce</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>thin films
Bibliographic record
Abstract
Using resistivity measurements as a function of applied magnetic field down to 38 mK, we evaluate the temperature dependence of the c-axis upper critical field ${(H}_{c2,\ensuremath{\rho}})$ for electron-doped ${\mathrm{Pr}}_{2\ensuremath{-}x}{\mathrm{Ce}}_{x}{\mathrm{CuO}}_{4}$ thin films. We compare its temperature dependence to the irreversibility line as determined by ac susceptibility $[{H}_{\mathrm{IL}}(T)]$ between 2 K and the transition temperature. For all Ce contents, ${H}_{c2,\ensuremath{\rho}}(T)$ presents an upward curvature, with no sign of the expected conventional saturation at low temperature, even down to 38 mK. The onset of resistivity follows closely the irreversibility line, and the general trend in temperature for ${H}_{c2,\ensuremath{\rho}}(T)$ is rather insensitive to the criterion used for its determination. Only a rough criterion corresponding to a full recovery of the normal-state resistivity for $x=0.15$ is bringing the characteristic field temperature dependence close to the expected description by Werthamer, Helfand and Hohenberg. Doping affects mainly the zero-temperature value of ${H}_{c2,\ensuremath{\rho}}$ and ${H}_{\mathrm{IL}}$ which are scaling with the critical temperature, but not the superconducting gap. The temperature dependence is very similar to that observed with the hole-doped cuprates, and underlines a similar physical origin related to the properties in the vortex-liquid phase and contributions of superconducting fluctuations.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.013 | 0.001 |
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".