NMR Search for the Spin Nematic State in a LaFeAsO Single Crystal
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Bibliographic record
Abstract
We report a $^{75}\mathrm{As}$ single crystal NMR investigation of LaFeAsO, the parent phase of a pnictide high ${T}_{c}$ superconductor. We demonstrate that spin dynamics develop a strong twofold anisotropy within each orthorhombic domain below the tetragonal-orthorhombic structural phase transition at ${T}_{\mathrm{TO}}\ensuremath{\approx}156\text{ }\text{ }\mathrm{K}$. This intermediate state with a dynamical breaking of the rotational symmetry freezes progressively into a spin density wave below ${T}_{\mathrm{SDW}}\ensuremath{\approx}142\text{ }\text{ }\mathrm{K}$. Our findings are consistent with the presence of a spin nematic state below ${T}_{\mathrm{TO}}$ with an incipient magnetic order.
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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 | 0.002 | 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) | 0.000 | 0.000 |
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 it