Second harmonic generation in ferroelectric Ba<sub>2</sub>EuFeNb<sub>4</sub>O<sub>15</sub>-based epitaxial thin films
Bibliographic record
Abstract
Ba 2 EuFeNb 4 O 15 -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 Ba 2 EuFeNb 4 O 15 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 Ba 2 EuFeNb 4 O 15 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 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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
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".