Crystal Growth and Neutron Scattering Study on High Tc Superconductors La_{1.6-x}Nd_{0.4}Sr_{x}CuO_{4}
Bibliographic record
Abstract
Superconductivity has been a topical dicovery of materials research and condensed matter physics since its discovery in 1911. It has seen applications appear within cutting edge technology, yet the mechanism for this exotic quantum phenomena remains unclear. This thesis is centred on the preliminary study on one family of the cuprate high Tc superconductors, the La1.6−xNd0.4SrxCuO4 (Nd-LSCO) system. We were able to synthesize single phase polycrystalline material of Nd-LSCO across its phase diagram from x 0.02 to x 0.4. We were also able to grown three large, high quality single crystal samples of this system at high doping, for the first time. Large single crystals of La1.6−xNd0.4SrxCuO4 (x=0.17, 0.19 and 0.24) were successfully grown using the traveling solvent floating zone technique. This thesis focuses on an introduction to the relevant materials preparation and crystal growth techniques and a discussion of some of the characterization of the samples which necessarily is involved in such a systematic study.
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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 | 0.000 | 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".