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 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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.016 | 0.001 |
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 teacher head, 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".