Universal heat conduction and nodal gap structure of the heavy-fermion superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CeIrIn</mml:mtext></mml:mrow><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
The effect of impurity scattering on the thermal conductivity $\ensuremath{\kappa}$ of the heavy-fermion superconductor ${\text{CeIrIn}}_{5}$ was studied for a current parallel $(J\ensuremath{\parallel}c)$ and perpendicular $(J\ensuremath{\parallel}a)$ to the tetragonal $c$ axis. For $J\ensuremath{\parallel}a$, adding La impurities does not change the residual linear term ${\ensuremath{\kappa}}_{0a}/T$, showing that heat conduction in the basal plane is universal, compelling evidence that the superconducting gap vanishes along a symmetry-imposed line. By contrast, for $J\ensuremath{\parallel}c$, La impurities greatly enhance the residual linear term ${\ensuremath{\kappa}}_{0c}/T$. This is strong evidence that the line of nodes lies within the basal plane, a gap structure which is inconsistent with the $d$-wave symmetry proposed for the isostructural superconductor ${\text{CeCoIn}}_{5}$. Different symmetries in the two materials could explain why the phase diagram of this heavy-fermion family consists of two separate superconducting domes. We also compare our data on ${\text{CeIrIn}}_{5}$ to corresponding data on the heavy-fermion superconductor ${\text{UPt}}_{3}$, where no universal conduction is observed.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.002 |
| 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) | 0.126 | 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".