Suppression of molecular field by lattice contraction in face-centered-cubic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>R</mml:mi><mml:msub><mml:mi>Ni</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mi>Cd</mml:mi></mml:mrow></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi>Ce</mml:mi><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mi>Nd</mml:mi><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mi>Sm</mml:mi><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mtext>and</mml:mtext><mml:mo> </mml:mo><mml:mi>Gd</mml:mi><mml:mo>–</mml:mo><mml:mi>Tm</mml:mi><mml:mo>)</mml:mo></mml:math>
Bibliographic record
Abstract
Single crystals of $R{\mathrm{Ni}}_{4}\mathrm{Cd}$ $(R$ = Ce, Nd, Sm, and $\mathrm{Gd}\ensuremath{-}\mathrm{Tm})$ are grown by Cd flux and their physical properties are investigated by means of x-ray diffraction, magnetization, electrical resistivity, and specific heat measurements. Except for $R=\mathrm{Ce}$, the unit cell volume of $R{\mathrm{Ni}}_{4}\mathrm{Cd}$ follows a lanthanide contraction, implying a $3+$ valence state of rare-earth ions in this series. At high temperatures, magnetic susceptibility curves for $R=\mathrm{Nd}$ and Gd--Tm follow the Curie-Weiss behavior. The obtained Curie-Weiss temperature $({\ensuremath{\theta}}_{p})$ for $R=\mathrm{Gd}\text{--}\mathrm{Tm}$ is small and negative. The temperature dependence of the electrical resistivity shows a metallic behavior for all $R{\mathrm{Ni}}_{4}\mathrm{Cd}$ compounds. Of the thermodynamic and transport property measurements, only ${\mathrm{GdNi}}_{4}\mathrm{Cd}$ indicates an antiferromagnetic ordering below ${T}_{N}=4.5\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, while the remaining compounds show no signature of magnetic transition down to 1.8 K. The Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange mechanism is examined for its relevance to ${T}_{N}$ and ${\ensuremath{\theta}}_{p}$ of isostructural metallic $R{T}_{4}X$ $(R=\mathrm{Gd}\text{--}\mathrm{Tm}$, $T=\mathrm{Cu} \mathrm{and} \mathrm{Ni}, \mathrm{and} X=\mathrm{Cd}, \mathrm{In}, \mathrm{Mg}, \mathrm{Pd}, \mathrm{Ag}, \mathrm{and} \mathrm{Au})$ compounds. Although the variation in ${\ensuremath{\theta}}_{p}$ can be qualitatively explained by the RKKY sum, the values of ${\ensuremath{\theta}}_{p}$ in this family are highly dependent on their lattice parameter. Unlike the $R{\mathrm{Cu}}_{4}X$, the strength of the exchange interaction between molecular fields produced by rare-earth planes is strongly suppressed by the lattice contraction in $R{\mathrm{Ni}}_{4}X$ compounds.
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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 | 0.012 | 0.012 |
| Meta-epidemiology (narrow) | 0.009 | 0.015 |
| Meta-epidemiology (broad) | 0.004 | 0.016 |
| Bibliometrics | 0.004 | 0.011 |
| Science and technology studies | 0.011 | 0.011 |
| Scholarly communication | 0.010 | 0.010 |
| Open science | 0.016 | 0.014 |
| Research integrity | 0.013 | 0.015 |
| Insufficient payload (model declined to judge) | 0.115 | 0.016 |
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".