Optical study of electronic structure and electron-phonon coupling in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Zr</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
We report the optical $(6\phantom{\rule{0.3em}{0ex}}\mathrm{meV}--4\phantom{\rule{0.3em}{0ex}}\mathrm{eV})$ properties of a boride superconductor $\mathrm{Zr}{\mathrm{B}}_{12}$ $({T}_{c}=6\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ in the normal state from $20\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ measured on high-quality single crystals by a combination of reflectivity and ellipsometry. The Drude plasma frequency and interband optical conductivity calculated by the self-consistent, full-potential linear muffin-tin orbital method agree well with experimental data. The Eliashberg function ${\ensuremath{\alpha}}_{\mathrm{tr}}^{2}F(\ensuremath{\omega})$ extracted from optical spectra features two peaks at about 25 and $80\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$, in agreement with specific heat data. The total coupling constant is ${\ensuremath{\lambda}}_{\mathrm{tr}}=1.0\ifmmode\pm\else\textpm\fi{}0.35$. The low-energy peak presumably corresponds to the displacement mode of Zr inside ${B}_{24}$ cages, while the second one involves largely boron atoms. In addition to the usual narrowing of the Drude peak with cooling down, we observed an unexpected removal of about 10% of the Drude spectral weight, which was partially transferred to the region of the lowest-energy interband transition $(\ensuremath{\sim}1\phantom{\rule{0.3em}{0ex}}\mathrm{eV})$. This effect may be caused by the delocalization of the metal ion from the center of the ${B}_{24}$ cluster.
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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 | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.015 | 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; 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".