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 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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.006 |
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".