Observation of van der Waals phonons in the single-layer cuprate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>Bi</mml:mi><mml:mo>,</mml:mo><mml:mi>Pb</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>Sr</mml:mi><mml:mo>,</mml:mo><mml:mi>La</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
Interlayer van der Waals (vdW) coupling is ubiquitous in two-dimensional materials. The authors explore these interactions in the cuprate (Bi, Pb)${}_{2}$(Sr,La)${}_{2}$CuO${}_{6+\ensuremath{\delta}}$, revealing ultra-low energy phonon modes similar to graphene and transition metal dichalcogenides. Using high-resolution inelastic hard x-ray scattering and first-principles simulations, they reveal vdW phonons from the shear motion of adjacent Bi-O layers. These findings deepen our understanding of the vibrational properties of cuprates and suggest opportunities for the design of novel heterostructures. These results highlight the generic nature of vdW modes in layered materials, including doped copper oxides, and provide insights for future materials design and research.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
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 | 0.012 | 0.008 |
| Meta-epidemiology (narrow) | 0.006 | 0.012 |
| Meta-epidemiology (broad) | 0.003 | 0.012 |
| Bibliometrics | 0.004 | 0.008 |
| Science and technology studies | 0.008 | 0.010 |
| Scholarly communication | 0.010 | 0.010 |
| Open science | 0.013 | 0.011 |
| Research integrity | 0.011 | 0.010 |
| Insufficient payload (model declined to judge) | 0.712 | 0.012 |
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; both teacher heads agree on what is shown here.
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".