Perfect Domain-Lattice Matching between MgB<sub>2</sub>and Al<sub>2</sub>O<sub>3</sub>: Single-Crystal MgB<sub>2</sub>Thin Films Grown on Sapphire
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Bibliographic record
Abstract
We have found that single-crystal films can be grown on (0001) Al 2 O 3 substrates through the golden relation of a perfect lattice-matching ratio (8:3√3) between the a -axis lattice constants of MgB 2 and Al 2 O 3 . Selected-area electron diffraction patterns evidently indicate hexagonal MgB 2 film with a 30° in-plane rotation with respect to the Al 2 O 3 substrate. The critical current density at zero field is comparable to the depairing critical current density and rapidly decreases with increasing applied field owing to the lack of pinning sites, as observed for high-quality MgB 2 single crystals.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.003 |
| 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