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
Bibliographic record
Abstract
Abstract Chemical pressure was introduced by replacing Ba atoms with Sr atoms in the spin‐ladder compounds AEFe2Ch2O (AE = Ba, Sr; Ch = S, Se). Powders and small single crystals of SrFe2S2O and SrFe2Se2O 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 SrFe2S2O and SrFe2Se2O suggest the presence of localized divalent Fe ions in the FeCh3O structural units (distorted e3t23 configuration, S = 2). Single sharp hyperfine patterns at 5 K indicate the formation of simple antiferromagnetic ground states. The spin‐ordering transitions (TN) were determined by magnetic, resistivity, and specific heat data to be 216 and 228 K for SrFe2S2O and SrFe2Se2O, respectively. At ca. 540 K, both compounds exhibit a similar broad maximum in χ (Tχmax). In comparison with BaFe2S2O and BaFe2Se2O, the Sr homologues have higher Tχmax 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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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".