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 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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.040 | 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 teacher head, 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".