Atomic-scale mapping of interfacial phonon modes in epitaxial <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>YB</mml:mi> <mml:msub> <mml:mi mathvariant="normal">a</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:mi mathvariant="normal">C</mml:mi> <mml:msub> <mml:mi mathvariant="normal">u</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:msub> <mml:mi mathvariant="normal">O</mml:mi> <mml:mrow> <mml:mn>7</mml:mn> <mml:mtext>−</mml:mtext> <mml:mi>δ</mml:mi> </mml:mrow> </mml:msub> <mml:mo>/</mml:mo> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>La</mml:mi> <mml:mo>,</mml:mo> <mml:mi>Sr</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>Al</mml:mi> <mml:mo>,</mml:mo> <mml:mi>Ta</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:msub> <mml:mi mathvariant="normal">O</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> thin films: The role of surface phonons
Bibliographic record
Abstract
We investigate the behavior of phonons at the epitaxial interface between $\mathrm{YB}{\mathrm{a}}_{2}\mathrm{C}{\mathrm{u}}_{3}{\mathrm{O}}_{7\text{\ensuremath{-}}\ensuremath{\delta}}$ thin film and $(\mathrm{La},\mathrm{Sr})(\mathrm{Al},\mathrm{Ta}){\mathrm{O}}_{3}$ substrate using vibrational electron energy loss spectroscopy. Interfacial phonon modes with different degrees of scattering localization were identified. We find evidence that surface contributions from the surrounding environment can impose additional scattering modulation onto local EELS measurements at the interface. A method to remove those contributions is then used to isolate the phonon information at the interface. This work unveils interfacial phonon modes in a high-$T{}_{c}$ cuprate superconductor, that are not accessible with traditional phonon spectroscopy techniques, and provides a method for probing interfacial phonons in complex oxide heterostructures.
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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 | 0.015 | 0.008 |
| Meta-epidemiology (narrow) | 0.008 | 0.015 |
| Meta-epidemiology (broad) | 0.004 | 0.014 |
| Bibliometrics | 0.005 | 0.010 |
| Science and technology studies | 0.011 | 0.013 |
| Scholarly communication | 0.011 | 0.013 |
| Open science | 0.018 | 0.017 |
| Research integrity | 0.015 | 0.013 |
| Insufficient payload (model declined to judge) | 0.724 | 0.012 |
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".