Field-induced transformation of complex spin ordering and magnetodielectric and magnetoelastic coupling in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>MnGeTeO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
Spin-frustrated systems are well known for exhibiting fascinating and exotic magnetic properties and are often intertwined with other intriguing phenomena. Magnetization and specific-heat studies suggest that the spin-frustrated chiral triangular lattice compound ${\mathrm{MnGeTeO}}_{6}$ undergoes a long-range antiferromagnetic transition below the N\'eel temperature $({T}_{\mathrm{N}})$ \ensuremath{\sim} 9 K, which is further validated in the neutron powder-diffraction (NPD) study. In the absence of an external magnetic field $(H)$, analysis of NPD data reveals a complex incommensurate spin structure, characterized by a mixture of helical and cycloidal spin orderings with a propagation vector of $\mathbit{k}=(1/3, 1/3, 0.184)$. Upon the application of $H$, this spin ordering transforms into a conical spin structure, which is manifested as a metamagnetic transition in the isothermal magnetization $(M)$ curve when $H$ exceeds \ensuremath{\sim} 0.9 T. Total energy calculations and estimation of various exchange-interaction energies $(J)$ by density-functional theory calculations also support the formation of such a complex spin ordering. Moreover, a pronounced dielectric $({\ensuremath{\varepsilon}}^{\ensuremath{'}})$ anomaly is observed near ${T}_{\mathrm{N}}$, which is suppressed considerably under H. The variation of ${\ensuremath{\varepsilon}}^{\ensuremath{'}}$ with increasing H closely reflects the $\mathrm{\ensuremath{\Delta}}{\ensuremath{\varepsilon}}^{\ensuremath{'}}\phantom{\rule{4pt}{0ex}}\ensuremath{\propto}$ ${M}^{2}$ scaling behavior in the low-H regime, thus indicating a higher-order magnetoelectric coupling. Moreover, synchrotron x-ray diffraction reveals an isostructural distortion below ${T}_{\mathrm{N}}$, suggesting magnetoelastic coupling as a trigger for the dielectric anomaly.
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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) | 0.003 | 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".