Static and dynamic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>X</mml:mi><mml:mi>Y</mml:mi></mml:mrow></mml:math>-like short-range order in a frustrated magnet with exchange disorder
Bibliographic record
Abstract
A single crystal of the ${\mathrm{Co}}^{2+}\text{\ensuremath{-}}\mathrm{based}$ pyrochlore ${\mathrm{NaCaCo}}_{2}{\mathrm{F}}_{7}$ was studied by inelastic neutron scattering. This frustrated magnet with quenched exchange disorder remains in a strongly correlated paramagnetic state down to 1/60th of the Curie-Weiss temperature. Below ${T}_{f}=2.4$ K, diffuse elastic scattering develops and comprises $30\ifmmode\pm\else\textpm\fi{}10\phantom{\rule{0.16em}{0ex}}%$ of the total magnetic scattering, as expected for ${J}_{\text{eff}}=1/2$ moments frozen on a time scale that exceeds $\ensuremath{\hbar}/\ensuremath{\delta}E=3.8$ ps. The diffuse scattering is consistent with short range $XY$ antiferromagnetism with a correlation length of 16 \AA{}. The momentum $(\mathbit{Q})$ dependence of the inelastic intensity indicates relaxing $XY$-like antiferromagnetic clusters at energies below $\ensuremath{\sim}5.5$ meV, and collinear antiferromagnetic fluctuations above this energy. The relevant $XY$ configurations form a continuous manifold of symmetry-related states. Contrary to well-known models that produce this continuous manifold, order-by-disorder does not select an ordered state in ${\mathrm{NaCaCo}}_{2}{\mathrm{F}}_{7}$ despite evidence for weak $(\ensuremath{\sim}12%)$ exchange disorder. Instead, ${\mathrm{NaCaCo}}_{2}{\mathrm{F}}_{7}$ freezes into short range ordered clusters that span this manifold.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.006 | 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".