Avoided Quantum Criticality and Magnetoelastic Coupling in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BaFe</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ni</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Why this work is in the frame
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Bibliographic record
Abstract
We study the structural and magnetic orders in electron-doped ${\mathrm{BaFe}}_{2\ensuremath{-}x}{\mathrm{Ni}}_{x}{\mathrm{As}}_{2}$ by high-resolution synchrotron x-ray and neutron scatterings. Upon Ni doping $x$, the nearly simultaneous tetragonal-to-orthorhombic structural (${T}_{s}$) and antiferromagnetic (${T}_{N}$) phase transitions in ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ are gradually suppressed and separated, resulting in ${T}_{s}>{T}_{N}$ with increasing $x$, as was previously observed. However, the temperature separation between ${T}_{s}$ and ${T}_{N}$ decreases with increasing $x$ for $x\ensuremath{\ge}0.065$, tending toward a quantum bicritical point near optimal superconductivity at $x\ensuremath{\approx}0.1$. The zero-temperature transition is preempted by the formation of a secondary incommensurate magnetic phase in the region $0.088\ensuremath{\lesssim}x\ensuremath{\lesssim}0.104$, resulting in a finite value of ${T}_{N}\ensuremath{\approx}{T}_{c}+10\text{ }\text{ }\mathrm{K}$ above the superconducting dome around $x\ensuremath{\approx}0.1$. Our results imply an avoided quantum critical point, which is expected to strongly influence the properties of both the normal and superconducting states.
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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 | 0.008 | 0.010 |
| Meta-epidemiology (narrow) | 0.003 | 0.006 |
| Meta-epidemiology (broad) | 0.002 | 0.006 |
| Bibliometrics | 0.002 | 0.005 |
| Science and technology studies | 0.005 | 0.008 |
| Scholarly communication | 0.006 | 0.006 |
| Open science | 0.008 | 0.007 |
| Research integrity | 0.005 | 0.007 |
| Insufficient payload (model declined to judge) | 0.638 | 0.012 |
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 it