Hidden spin liquid in an antiferromagnet: Applications to FeCrAs
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Bibliographic record
Abstract
The recently studied material FeCrAs exhibits a surprising combination of experimental signatures, with metallic, Fermi-liquid-like specific heat but resistivity showing strong nonmetallic character. The $\mathrm{Cr}$ sublattice posseses local magnetic moments, in the form of stacked (distorted) kagome lattices. Despite the high degree of magnetic frustration, antiferromagnetic order develops below ${T}_{N}\ensuremath{\sim}125\phantom{\rule{0.28em}{0ex}}\text{K}$ suggesting the nonmagnetic $\mathrm{Fe}$ sublattice may play a role in stabilizing the ordering. From the material properties we propose a microscopic Hamiltonian for the low-energy degrees of freedom, including the nonmagnetic $\mathrm{Fe}$ sublattice, and study its properties using slave-rotor mean-field theory. Using this approach we find a spin-liquid phase on the $\mathrm{Fe}$ sublattice, which survives even in the presence of the magnetic $\mathrm{Cr}$ sublattice. Finally, we suggest that the features of FeCrAs can be qualitatively explained by critical fluctuations in the nonmagnetic Fe sublattice due to proximity to a metal-insulator transition.
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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 | 0.000 | 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.005 |
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