Thermal Conductivity of the Iron-Based Superconductor FeSe: Nodeless Gap with a Strong Two-Band Character
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Bibliographic record
Abstract
The thermal conductivity $\ensuremath{\kappa}$ of the iron-based superconductor FeSe was measured at temperatures down to 75 mK in magnetic fields up to 17 T. In a zero magnetic field, the electronic residual linear term in the $T=0\text{ }\text{ }\mathrm{K}$ limit, ${\ensuremath{\kappa}}_{0}/T$, is vanishingly small. The application of a magnetic field $B$ causes an exponential increase in ${\ensuremath{\kappa}}_{0}/T$ initially. Those two observations show that there are no zero-energy quasiparticles that carry heat and therefore no nodes in the superconducting gap of FeSe. The full field dependence of ${\ensuremath{\kappa}}_{0}/T$ has the classic two-step shape of a two-band superconductor: a first rise at very low field, with a characteristic field ${B}^{\ensuremath{\star}}\ensuremath{\ll}{B}_{c2}$, and then a second rise up to the upper critical field ${B}_{c2}$. This shows that the superconducting gap is very small (but finite) on one of the pockets in the Fermi surface of FeSe. We estimate that the minimum value of the gap, ${\mathrm{\ensuremath{\Delta}}}_{\mathrm{min}}$, is an order of magnitude smaller than the maximum value, ${\mathrm{\ensuremath{\Delta}}}_{\mathrm{max}}$.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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 it