Spin reorientation in FeCrAs revealed by single-crystal neutron diffraction
Bibliographic record
Abstract
The magnetic structure of the ``nonmetallic metal'' FeCrAs, a compound with the characters of both metals and insulators, was examined as a function of temperature using single-crystal neutron diffraction. The magnetic propagation vector was found to be $k=(1/3,1/3,0)$, and the magnetic reflections disappeared above ${T}_{N}=116(1)\phantom{\rule{0.28em}{0ex}}\mathrm{K}$. In the ground state, the Cr sublattice shows an in-plane spiral antiferromagnetic order. The moment sizes of the Cr ions were found to be small due to strong magnetic frustration in the distorted kagome lattice or the itinerant nature of the Cr magnetism and vary between 0.8 and $1.4\phantom{\rule{0.16em}{0ex}}{\ensuremath{\mu}}_{B}$ on different sites as expected for a spin-density-wave- (SDW-) type order. The upper limit of the moment on the Fe sublattice is estimated to be less than $0.1\phantom{\rule{0.16em}{0ex}}{\ensuremath{\mu}}_{B}$. With increasing temperature up to 95 K, the Cr moments cant out of the $ab$ plane gradually with the in-plane components being suppressed and the out-of-plane components increasing in contrast. This spin reorientation of Cr moments can explain the dip in the $\mathit{c}$-direction magnetic susceptibility and the kink in the magnetic order parameter at ${T}_{O}\ensuremath{\sim}100\phantom{\rule{0.28em}{0ex}}\mathrm{K}$, a second magnetic transition which was ignored before. We have also discussed the similarity between FeCrAs and the model itinerant magnet Cr, which exhibits spin-flip transitions and SDW-type antiferromagnetism.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.006 |
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 teacher head, 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".