Periodic Structure Formed by Atomic-Disordered Lamellar Building Blocks Enables Two-Dimensional Superconductivity in SiP <sub>2</sub>
Bibliographic record
Abstract
The discovery of quasicrystals and ordered amorphous carbon clusters significantly expands our understanding of the static topological order in solids that goes beyond crystalline and amorphous phases. However, our knowledge of unconventional structures constructed from various disordered building blocks remains extremely limited. Here, we report the successful construction of an ordered-stacking amorphous layer structure in SiP 2 from its pristine crystal form using the high-pressure method, which was robustly validated through scanning transmission electron microscopy and X-ray diffraction analyses. Remarkably, typical two-dimensional superconductivity was found in the unique structure of SiP 2 bulks, as evidenced by the Berezinskii-Kosterlitz-Thouless transition and anisotropic upper critical field measurements. Theoretical calculations reveal that the mutual repulsion of the lone-pair electrons on the phosphorus atoms exposed between the SiP 2 layers hinders the interlayer bonding, stabilizing the layered stacking structure and enabling 2D superconductivity under high pressure. This work introduces an unrevealed solid-state category with exotic properties according to the degree of static topological order.
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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".