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Bibliographic record
Abstract
We report an Fe $K\ensuremath{\beta}$ x-ray emission spectroscopy study of local magnetic moments in the rare-earth doped iron pnictide ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{RE}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ ($\mathrm{RE}=\mathrm{La}$, Pr, and Nd). In all samples studied the size of the Fe local moment is found to decrease significantly with temperature and goes from $\ensuremath{\sim}0.9{\ensuremath{\mu}}_{B}$ at $T=300\text{ }\text{ }\mathrm{K}$ to $\ensuremath{\sim}0.45{\ensuremath{\mu}}_{B}$ at $T=70\text{ }\text{ }\mathrm{K}$. In the collapsed tetragonal phase of Nd- and Pr-doped samples ($T<70\text{ }\text{ }\mathrm{K}$) the local moment is quenched, while the moment remains unchanged for the La-doped sample, which does not show lattice collapse. Our results show that ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{RE}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ ($\mathrm{RE}=\mathrm{Pr}$ and Nd) exhibits a spin-state transition and provide direct evidence for a nonmagnetic ${\mathrm{Fe}}^{2+}$ ion in the collapsed tetragonal phase; spin state as predicted by Yildirim. We argue that the gradual change of the spin state over a wide temperature range reveals the importance of multiorbital physics, in particular the competition between the crystal field split Fe $3d$ orbitals and the Hund's rule coupling.
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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 | 0.001 | 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 | 0.002 |
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