Second harmonic generation in ferroelectric Ba<sub>2</sub>EuFeNb<sub>4</sub>O<sub>15</sub>-based epitaxial thin films
Bibliographic record
Abstract
Ba2EuFeNb4O15-based epitaxial ferroelectric thin films with tetragonal tungsten bronze crystal structures are shown to have nonlinear optical properties at room temperature and are promising candidates for integrated optical frequency convertors and related applications. High quality epitaxial ferroelectric thin films of tetragonal tungsten bronze Ba2EuFeNb4O15 have been synthesized on MgO(100) by pulsed laser deposition. Structural investigation reveals that the c-oriented films are rotated in plane by ±18.4° and ±31° with respect to the substrate structure. Stable ferroelectric properties were obtained by microelectromechanical characterization. Second harmonic generation related to the spontaneous polarization in the films was studied and the independent components of the nonlinear susceptibility were determined. Ferroelectric films of Ba2EuFeNb4O15 having a tetragonal tungsten bronze structure are new candidate for room temperature nonlinear optical applications.
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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) | 0.001 | 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".