Synthesis, Structure, and Physical Properties of Mixed Valent Mo<sub>2</sub>SbS<sub>2</sub>, the First Superconducting Antimonide-Sulfide
Bibliographic record
Abstract
We identified a new ternary molybdenum antimonide-sulfide, Mo 2 SbS 2 . Black, needle-shaped crystals of Mo 2 SbS 2 can be synthesized by reacting stoichiometric amounts of the elements at 850 °C for 7 days with I 2 (<2 wt %) as the transporting reagent; however, the crystals of Mo 2 SbS 2 are too small for a single-crystal structure investigation. Therefore, the crystal structure of Mo 2 SbS 2 was analyzed by powder X-ray diffraction using Rietveld refinements. The compound crystallizes in a monoclinic system (space group P 2 1 / m, a = 6.50920(7) Å, b = 3.18231(4) Å, c = 9.3548(1) Å, β = 105.4430(8)°, Z = 2). The title compound is isostructural with Mo 2 S 3; and the Mo−Mo, Mo−Sb, and Mo−S distances are comparable with those in MoSb 2 S. The results from the Seebeck coefficient and magnetic susceptibility measurements and electronic band structure calculations suggest metallic behavior. The band structure of Mo 2 SbS 2 exhibits van Hove singularities hinting at superconductivity, which was subsequently confirmed via magnetic susceptibility measurements.
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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) | 0.000 | 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 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".