Field-Dependent Diamagnetic Transition in Magnetic Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">S</mml:mi><mml:mi mathvariant="normal">m</mml:mi></mml:mrow><mml:mn>1.85</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mn>0.15</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">u</mml:mi><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:math>
Bibliographic record
Abstract
The magnetic penetration depth of single crystal ${\mathrm{S}\mathrm{m}}_{1.85}{\mathrm{C}\mathrm{e}}_{0.15}{\mathrm{C}\mathrm{u}\mathrm{O}}_{4\ensuremath{-}y}$ was measured down to 0.4 K in dc fields up to 7 kOe. For insulating ${\mathrm{S}\mathrm{m}}_{2}{\mathrm{C}\mathrm{u}\mathrm{O}}_{4}$, ${\mathrm{S}\mathrm{m}}^{3+}$ spins order at the N\'eel temperature, ${T}_{N}=6\text{ }\text{ }\mathrm{K}$, independent of the applied field. Superconducting ${\mathrm{S}\mathrm{m}}_{1.85}{\mathrm{C}\mathrm{e}}_{0.15}{\mathrm{C}\mathrm{u}\mathrm{O}}_{4\ensuremath{-}y}$ (${T}_{c}\ensuremath{\approx}23\text{ }\text{ }\mathrm{K}$) shows a sharp increase in diamagnetic screening below ${T}^{*}(H)$ which varied from 4.0 K ($H=0$) to 0.5 K ($H=7\text{ }\text{ }\mathrm{k}\mathrm{O}\mathrm{e}$) for a field along the $c$ axis. If the field was aligned parallel to the conducting planes, ${T}^{*}$ remained unchanged. The unusual field dependence of ${T}^{*}$ indicates a spin-freezing transition that dramatically increases the superfluid density.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.032 | 0.004 |
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".