Phonons in the 214 high temperature cuprate superconductors at x = 1/8 hole doping
Bibliographic record
Abstract
The problem of phonons and their influence on superconductivity in high temperature cuprate superconductors is a long standing one. However, advances in neutron scattering, especially at the Spallation Neutron Source, make it timely to revisit this problem. Neutron techniques are also sensitive to spin fluctuations and crystal electric field (CEF) levels. Understanding any of these degrees of freedom individually involves some quantitative understanding of all of them as there is very significant overlap in Q and energy, and their relative intensities are comparable. Neutron spectroscopic measurements have been carried out on a family of 214 cuprate superconductors of the form La(2−x−y)Nd(y)Sr(x)CuO4 with hole doping x = 1/8 and the isoelectronic Nd doping such that y varies from y = 0 to y = 0.4. This system shows superconducting TCs that vary by a factor of 9 (TC∼ 3 K for y = 0.4 to TC∼ 28 K for y = 0) even though the hole doping does not change. Our measurements of the phonon dispersions using time-of-flight neutron spectrometers shows both common features and interesting variations across this series. In particular, there is a low-lying optic phonon near 19 meV which is strong in the y = 0 member (LCSO) but absent in the y = 0.4 member.
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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 | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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".