Intertwined charge and spin density waves in a topological kagome material
Bibliographic record
Abstract
Using neutrons and x rays we show the topological kagome antiferromagnet <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>Mn</a:mi><a:mn>3</a:mn></a:msub><a:mi>Sn</a:mi></a:mrow></a:math> for <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mi>T</b:mi><b:mo><</b:mo><b:mn>285</b:mn><b:mspace width="0.28em"/><b:mi mathvariant="normal">K</b:mi></b:mrow></b:math> forms a homogeneous spin and charge ordered state comprising a longitudinally polarized spin density wave with wave vector <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"><e:mrow><e:msub><e:mi mathvariant="bold">k</e:mi><e:mi>β</e:mi></e:msub><e:mo>=</e:mo><e:msub><e:mi>k</e:mi><e:mi>β</e:mi></e:msub><e:mover accent="true"><e:mi mathvariant="bold">c</e:mi><e:mo>̂</e:mo></e:mover></e:mrow></e:math>, a helical modulated version of the room temperature antichiral magnetic order with <i:math xmlns:i="http://www.w3.org/1998/Math/MathML"><i:mrow><i:msub><i:mi mathvariant="bold">k</i:mi><i:mi>χ</i:mi></i:msub><i:mo>=</i:mo><i:msub><i:mi>k</i:mi><i:mi>χ</i:mi></i:msub><i:mover accent="true"><i:mi mathvariant="bold">c</i:mi><i:mo>̂</i:mo></i:mover></i:mrow></i:math>, and charge density waves with wave vectors <m:math xmlns:m="http://www.w3.org/1998/Math/MathML"><m:mrow><m:mn>2</m:mn><m:msub><m:mi mathvariant="bold">k</m:mi><m:mi>β</m:mi></m:msub><m:mo>,</m:mo><m:mn>2</m:mn><m:msub><m:mi mathvariant="bold">k</m:mi><m:mi>χ</m:mi></m:msub></m:mrow></m:math>, and <p:math xmlns:p="http://www.w3.org/1998/Math/MathML"><p:mrow><p:msub><p:mi mathvariant="bold">k</p:mi><p:mi>β</p:mi></p:msub><p:mo>+</p:mo><p:msub><p:mi mathvariant="bold">k</p:mi><p:mi>χ</p:mi></p:msub></p:mrow></p:math>. Though <s:math xmlns:s="http://www.w3.org/1998/Math/MathML"><s:msub><s:mi mathvariant="bold">k</s:mi><s:mi>χ</s:mi></s:msub></s:math> and <u:math xmlns:u="http://www.w3.org/1998/Math/MathML"><u:msub><u:mi mathvariant="bold">k</u:mi><u:mi>β</u:mi></u:msub></u:math> coincide for <w:math xmlns:w="http://www.w3.org/1998/Math/MathML"><w:mrow><w:mn>200</w:mn><w:mspace width="4pt"/><w:mi mathvariant="normal">K</w:mi><w:mo><</w:mo><w:mi>T</w:mi><w:mo><</w:mo><w:mn>230</w:mn><w:mspace width="0.28em"/><w:mi mathvariant="normal">K</w:mi></w:mrow></w:math>, they exhibit distinct continuous <bb:math xmlns:bb="http://www.w3.org/1998/Math/MathML"><bb:mrow><bb:mi>T</bb:mi><bb:mspace width="4pt"/><bb:mi>dependencies</bb:mi></bb:mrow></bb:math> before locking to commensurate values of <db:math xmlns:db="http://www.w3.org/1998/Math/MathML"><db:mrow><db:msub><db:mi mathvariant="bold">k</db:mi><db:mi>β</db:mi></db:msub><db:mo>=</db:mo><db:mfrac><db:mn>1</db:mn><db:mn>12</db:mn></db:mfrac><db:msup><db:mrow><db:mi mathvariant="bold">c</db:mi></db:mrow><db:mo>*</db:mo></db:msup></db:mrow></db:math> and <gb:math xmlns:gb="http://www.w3.org/1998/Math/MathML"><gb:mrow><gb:msub><gb:mi mathvariant="bold">k</gb:mi><gb:mi>χ</gb:mi></gb:msub><gb:mo>=</gb:mo><gb:mfrac><gb:mn>5</gb:mn><gb:mn>48</gb:mn></gb:mfrac><gb:msup><gb:mrow><gb:mi mathvariant="bold">c</gb:mi></gb:mrow><gb:mo>*</gb:mo></gb:msup></gb:mrow></gb:math> at <jb:math xmlns:jb="http://www.w3.org/1998/Math/MathML"><jb:mrow><jb:mi>low</jb:mi><jb:mspace width="4pt"/><jb:mi>T</jb:mi></jb:mrow></jb:math>. Density functional theory indicates this complex modulated state may be associated with the nesting of Fermi surfaces from correlated flat kagome bands, which host Weyl nodes that are annihilated as it forms. Published by the American Physical Society 2024
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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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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".