Evidence for conventional superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">PdPt</mml:mi></mml:math> and prediction of possible topological superconductivity in disorder-free <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>γ</mml:mi><mml:mtext>−</mml:mtext><mml:mi>BiPd</mml:mi></mml:mrow></mml:math>
Bibliographic record
Abstract
We present comprehensive investigations into the structural, superconducting, and topological properties of ${\mathrm{Bi}}_{2}\mathrm{PdPt}$. Magnetization and heat-capacity measurements performed on polycrystalline ${\mathrm{Bi}}_{2}\mathrm{PdPt}$ demonstrate a superconducting transition at $\ensuremath{\simeq}$ 0.8 K. Moreover, muon spin relaxation/rotation ($\textmu{}\mathrm{SR}$) measurements present evidence for a time-reversal symmetry preserving, isotropically gapped superconducting state in ${\mathrm{Bi}}_{2}\mathrm{PdPt}$. We have also performed density-functional theory (DFT) calculations on ${\mathrm{Bi}}_{2}\mathrm{PdPt}$ alongside the more general isostructural systems ${\mathrm{BiPd}}_{x}{\mathrm{Pt}}_{1\ensuremath{-}x}$, of which ${\mathrm{Bi}}_{2}\mathrm{PdPt}$ and $\ensuremath{\gamma}$-BiPd are special cases for $x=0.5$ and $x=1$, respectively. We have calculated the ${Z}_{2}$ topological index from our DFT calculations for a range of substitution fractions $x$, between $x=0$ and $x=1$, characterizing the topology of the band structure. We find a nontrivial topological state when $x>0.75$ and a trivial topological state when $x<0.75$. Therefore our results indicate that ${\mathrm{BiPd}}_{x}{\mathrm{Pt}}_{1\ensuremath{-}x}$ could be a topological superconductor for $x>0.75$.
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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) | 0.006 | 0.001 |
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".