Electronic structures and low-dimensional magnetic properties of the ordered rocksalt oxides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Na</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Sb</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Na</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Te</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>
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Bibliographic record
Abstract
The ordered rocksalt-type oxide ${\mathrm{Na}}_{3}{\mathrm{Cu}}_{2}\mathrm{Sb}{\mathrm{O}}_{6}$ was synthesized and its magnetic properties were investigated. The broad peak in the temperature-dependent magnetic susceptibility data near $92\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ is indicative of the dominant low-dimensional short-range antiferromagnetic (AF) behavior. The data are very well fitted with the AF-AF alternating linear chain model with ${J}_{1}∕k=\ensuremath{-}79\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and ${J}_{2}∕{J}_{1}=0.39$. The high-temperature data $(T>300\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ exhibit Curie-Weiss behavior with a Weiss temperature of $\ensuremath{-}55(2)\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. These results are very similar to those reported for the isostructural oxide ${\mathrm{Na}}_{2}{\mathrm{Cu}}_{2}\mathrm{Te}{\mathrm{O}}_{6}$ [J. Xu et al., Inorg. Chem. 44, 5042 (2005)]. Recently, it was shown [Y. Miura et al., J. Phys. Soc. Jpn. 75, 847071 (2006)] that an AF-ferromagnetic (F) linear chain model gives an equally good fit to the low-temperature data for both compounds and that further analysis of magnetic heat capacity data supports the AF-F model. We reinvestigate this proposal by computing the intersite hopping integrals using both the tight-binding spin dimer analysis and the ${N}^{\text{th}}$-order muffin-tin-orbital downfolding procedure for both compounds. The calculations support the AF-AF model for the antimonide. Further, the Weiss temperatures derived from the high-temperature experimental data, $T>300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, are also consistent with the $J$ values derived from the AF-AF model but not with those obtained from the AF-F alternative.
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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 | 0.010 | 0.006 |
| Meta-epidemiology (narrow) | 0.006 | 0.012 |
| Meta-epidemiology (broad) | 0.003 | 0.010 |
| Bibliometrics | 0.004 | 0.008 |
| Science and technology studies | 0.010 | 0.009 |
| Scholarly communication | 0.009 | 0.010 |
| Open science | 0.013 | 0.014 |
| Research integrity | 0.011 | 0.011 |
| Insufficient payload (model declined to judge) | 0.744 | 0.009 |
Machine scores (provisional)
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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