Potential superconducting interfaces in polar <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:mi>B</mml:mi></mml:mrow><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:mi>Ba</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mi>Sr</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mi mathvariant="normal">BiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> heterostructures
Bibliographic record
Abstract
We predict that interfacing the known superconducting oxide $\mathrm{Ba}(\mathrm{Sr}){\mathrm{BiO}}_{3}$ with a polar terminated perovskite oxide leads to a two-dimensional (2D) electron and/or hole gasses with a density similar to superconducting K-doped bismuthates. These interfaces have the potential for high-${T}_{\text{c}}$ superconductivity without the strong scattering present in randomly chemically substituted bismuthates. We present a detailed density functional theory (DFT) based study of the electronic structure of heterostructures involving polar 001 oriented ${\mathrm{LaLuO}}_{3}$ (LLO) and ${\mathrm{SrBiO}}_{3}$ (SBO) alternating layers. Beyond the thickness of four unit cells, 2D electron and hole gasses are formed at opposite interfaces of ${\mathrm{SrBiO}}_{3}$ with sheet charge densities on the order of ${10}^{14}\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{\ensuremath{-}2}$. The electron and hole gasses exist around the $Y$ ($X$) and $M$ points of the Brillouin zone, respectively. The separation of the gasses and therefore their interactions can be regulated by the SBO layer thickness. This provides a platform in which charge density waves, excitonic insulators or condensates, and superconductors compete for the ground state with the potential for new physical properties including high-${T}_{\text{c}}$ superconductivity.
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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 | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.009 | 0.002 |
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".