Realization of Fully High‐Spin State and Strong Ferromagnetism in LaCoO<sub>3</sub> Monolayer
Bibliographic record
Abstract
Abstract Perovskite LaCoO 3 is a subject of extensive and ongoing investigation due to the delicate competition between high‐spin (HS) and low‐spin (LS) states of Co 3+ . On the other hand, their indistinct free energy boundary poses a significant challenge to annihilate the magnetically/electrically inert LS Co 3+ for yielding fully HS state. Here, electronic transformation from the conventional isovalent mixed HS/LS state () into an unprecedented aliovalent fully HS state () is demonstrated in monolayer LaCoO 3 confined by 5d SrIrO 3 slabs via atomically constructing SrIrO 3 /LaCoO 3 superlattices. Excitingly, this emergent fully HS monolayer exhibits not only remarkable 2D ferromagnetism beyond the Mermin–Wagner restriction, but also larger magnetization (≈1.8µ B /Co) and higher Curie temperature (above 100 K) than that of conventional thick film and any previously reported oxide‐based monolayer ferromagnets. Furthermore, Ir/Co hybridization driven orbital reconstruction with polarization beyond standard crystal field expectations is observed, which is supported by DFT calculations. The findings not only expand the electronic phase domains of LCO into fully HS state, but also provide a fresh platform for investigating the 2D magnetic physics under strongly spin‐orbit coupled regime and developing new 2D spintronic devices.
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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 | 0.000 | 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) | 0.002 | 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 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".