Magnetic-field effects on the fragile antiferromagnetism in YbBiPt
Bibliographic record
Abstract
We present neutron-diffraction data for the cubic-heavy-fermion YbBiPt that show broad magnetic diffraction peaks due to the fragile short-range antiferromagnetic (AFM) order persist under an applied magnetic-field $\mathbf{H}$. Our results for $\mathbf{H}\ensuremath{\perp}[\overline{1}\phantom{\rule{0.16em}{0ex}}1\phantom{\rule{0.16em}{0ex}}0]$ and a temperature of $T=0.14(1)\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ show that the $(\frac{1}{2},\frac{1}{2},\frac{3}{2})$ magnetic diffraction peak can be described by the same two-peak line shape found for ${\ensuremath{\mu}}_{0}H=0\phantom{\rule{0.16em}{0ex}}\mathrm{T}$ below the N\'eel temperature of ${T}_{\text{N}}=0.4\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Both components of the peak exist for ${\ensuremath{\mu}}_{0}H\ensuremath{\lesssim}1.4\phantom{\rule{0.16em}{0ex}}\text{T}$, which is well past the AFM phase boundary determined from our new resistivity data. Using neutron-diffraction data taken at $T=0.13(2)\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ for $\mathbf{H}\ensuremath{\parallel}[0\phantom{\rule{0.16em}{0ex}}0\phantom{\rule{0.16em}{0ex}}1]$ or $[1\phantom{\rule{0.16em}{0ex}}1\phantom{\rule{0.16em}{0ex}}0]$, we show that domains of short-range AFM order change size throughout the previously determined AFM and non-Fermi liquid regions of the phase diagram, and that the appearance of a magnetic diffraction peak at $(\frac{1}{2},\frac{1}{2},\frac{1}{2})$ at ${\ensuremath{\mu}}_{0}H\ensuremath{\approx}0.4\phantom{\rule{0.16em}{0ex}}\mathrm{T}$ signals canting of the ordered magnetic moment away from $[1\phantom{\rule{0.16em}{0ex}}1\phantom{\rule{0.16em}{0ex}}1]$. The continued broadness of the magnetic diffraction peaks under a magnetic field and their persistence across the AFM phase boundary established by detailed transport and thermodynamic experiments present an interesting quandary concerning the nature of YbBiPt's electronic ground state.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".