Periodic microtwinning as a possible mechanism for the accommodation of the epitaxial film-substrate mismatch in the La1-xSrxMnO3/SrTiO3 system
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Bibliographic record
Abstract
Abstract The structure and microstructure of laser-deposited La1−xSr x MnO3(x ≈ 0.1) films on SrTiO3(100) single-crystal substrates have been studied by means of electron diffraction and high-resolution transmission electron microscopy. The film–substrate interfaces are found to be perfectly coherent and in particular to be free of interfacial dislocations, the small misfit being accommodated either elastically or by the formation of periodic microtwins. Cross-section as well as plan-view specimens of films of four different thicknesses (9, 50, 100 and 220 nm) were studied in detail. The thinnest films were found to be rhombohedral when present as coherent epitaxial films in cross-section specimens, the misfit being accommodated by periodic microtwinning. When released from their substrate, as in plan-view specimens, films of the same thickness are domain-fragmented orthorhombic. It is suggested that the misfit stresses tend to favour a microtwinned rhombohedral structure, whereas unstressed films of the same thickness, released from the substrate, tend to become domain-fragmented orthorhombic. The observations illustrate in a striking manner the effect of misfit stresses on the microstructure of thin epitaxial films, explaining also the dependence of the physical properties on the film thickness and on the misfit.
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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 | 0.000 |
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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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 it