Quantum Critical Point in the Itinerant Ferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Rh</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline ${\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Rh}}_{x}$ alloys. Through magnetization and muon spin relaxation measurements, we show that the ferromagnetic ordering temperature is suppressed continuously to zero at ${x}_{\mathrm{crit}}=0.375$ while the magnetic volume fraction remains 100% up to ${x}_{\mathrm{crit}}$, pointing to a second order transition. Non-Fermi liquid behavior is observed close to ${x}_{\mathrm{crit}}$, where the electronic specific heat ${C}_{\mathrm{el}}/T$ diverges logarithmically, while immediately above ${x}_{\mathrm{crit}}$ the volume thermal expansion coefficient ${\ensuremath{\alpha}}_{V}/T$ and the Gr\"uneisen ratio $\mathrm{\ensuremath{\Gamma}}={\ensuremath{\alpha}}_{V}/{C}_{\mathrm{el}}$ both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in ${\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Rh}}_{x}$.
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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 | 0.005 | 0.005 |
| Meta-epidemiology (narrow) | 0.003 | 0.006 |
| Meta-epidemiology (broad) | 0.001 | 0.007 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.004 | 0.005 |
| Scholarly communication | 0.005 | 0.004 |
| Open science | 0.007 | 0.005 |
| Research integrity | 0.004 | 0.006 |
| Insufficient payload (model declined to judge) | 0.891 | 0.008 |
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; both teacher heads agree on what is shown here.
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".