Wiedemann-Franz law and nonvanishing temperature scale across the field-tuned quantum critical point of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mtext>YbRh</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mtext>Si</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>
Bibliographic record
Abstract
The in-plane thermal conductivity $\ensuremath{\kappa}$ and electrical resistivity $\ensuremath{\rho}$ of the heavy-fermion metal ${\text{YbRh}}_{2}$${\text{Si}}_{2}$ were measured down to 50 mK for magnetic fields $H$ parallel and perpendicular to the tetragonal $c$ axis, through the field-tuned quantum critical point ${H}_{c}$, at which antiferromagnetic order ends. The thermal and electrical resistivities, $w\ensuremath{\equiv}{L}_{0}T/\ensuremath{\kappa}$ and $\ensuremath{\rho}$, show a linear temperature dependence below 1 K, typical of the non-Fermi-liquid behavior found near antiferromagnetic quantum critical points, but this dependence does not persist down to $T=0$. Below a characteristic temperature ${T}^{\ensuremath{\star}}\ensuremath{\simeq}0.35$ K, which depends weakly on $H$, $w(T)$ and $\ensuremath{\rho}(T)$ both deviate downward and converge as $T\ensuremath{\rightarrow}0$. We propose that ${T}^{\ensuremath{\star}}$ marks the onset of short-range magnetic correlations, persisting beyond ${H}_{c}$. By comparing samples of different purity, we conclude that the Wiedemann-Franz law holds in ${\text{YbRh}}_{2}$${\text{Si}}_{2}$, even at ${H}_{c}$, implying that no fundamental breakdown of quasiparticle behavior occurs in this material. The overall phenomenology of heat and charge transport in ${\text{YbRh}}_{2}$${\text{Si}}_{2}$ is similar to that observed in the heavy-fermion metal ${\text{CeCoIn}}_{5}$, near its own field-tuned quantum critical point.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 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".