Synthesis and Characterization of Frustrated Spin Ladders SrFe<sub>2</sub>S<sub>2</sub>O and SrFe<sub>2</sub>Se<sub>2</sub>O
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Chemical pressure was introduced by replacing Ba atoms with Sr atoms in the spin‐ladder compounds AEFe 2 Ch 2 O (AE = Ba, Sr; Ch = S, Se). Powders and small single crystals of SrFe 2 S 2 O and SrFe 2 Se 2 O were synthesized from SrO, Fe, and Ch (S, Se). X‐ray diffraction data were used to determine the crystal structures, which showed prominent magnetic ladderlike sublattices. The Mössbauer spectra of SrFe 2 S 2 O and SrFe 2 Se 2 O suggest the presence of localized divalent Fe ions in the FeCh 3 O structural units (distorted e 3 t 2 3 configuration, S = 2). Single sharp hyperfine patterns at 5 K indicate the formation of simple antiferromagnetic ground states. The spin‐ordering transitions ( T N ) were determined by magnetic, resistivity, and specific heat data to be 216 and 228 K for SrFe 2 S 2 O and SrFe 2 Se 2 O, respectively. At ca. 540 K, both compounds exhibit a similar broad maximum in χ ( Tχ max ). In comparison with BaFe 2 S 2 O and BaFe 2 Se 2 O, the Sr homologues have higher T χ max values, which suggest stronger intersite exchange interactions in accordance with the chemical pressure from the replacement of Sr atoms with Ba atoms. However, the lower Néel temperatures for the Sr homologues supports the idea that magnetic frustration is present, and it clearly has to be considered for this group of compounds.
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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 | 0.004 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.002 |
| 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