Influence of epitaxial strain on the ferromagnetic semiconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>EuO</mml:mi></mml:mrow></mml:math>: First-principles calculations
Bibliographic record
Abstract
From first-principles calculations we investigate the electronic structure and the magnetic properties of $\mathrm{EuO}$ under hydrostatic stress and the appropriate biaxial stress for epitaxial films. There is a complex interdependence of the $\mathrm{O}\phantom{\rule{0.3em}{0ex}}2p$ and $\mathrm{Eu}\phantom{\rule{0.3em}{0ex}}4f$ and $5d$ bands on the magnetism in $\mathrm{EuO}$, and decreasing lattice parameters is an ideal method to increase the Curie temperature ${T}_{c}$. Compared to hydrostatic pressure, the out-of-plane compensation that is available to epitaxial films diminishes this increase in ${T}_{c}$, although the ${T}_{c}$ increase is nonetheless significant due to the small value of Poisson's ratio for $\mathrm{EuO}$. We find the semiconducting gap closes at a 6% in-plane lattice compression for epitaxy, at which point a significant conceptual change must occur in the active exchange mechanisms.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 0.001 |
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".