التفاصيل البيبلوغرافية
| العنوان: |
Giant anomalous Nernst signal in the antiferromagnet YbMnBi2 |
| المؤلفون: |
Mengyu Yao, Yu Pan, Yan Sun, Johannes Gooth, Claudia Felser, Joseph P. Heremans, Bin He, Congcong Le, Sarah J. Watzman |
| المصدر: |
Nature Materials |
| سنة النشر: |
2021 |
| مصطلحات موضوعية: |
Mathematics::General Topology, FOS: Physical sciences, 02 engineering and technology, 7. Clean energy, 01 natural sciences, Condensed Matter::Materials Science, Magnetization, symbols.namesake, Seebeck coefficient, Physics - Chemical Physics, 0103 physical sciences, Antiferromagnetism, General Materials Science, Nernst equation, 010306 general physics, Nernst effect, Physics, Chemical Physics (physics.chem-ph), Condensed Matter - Materials Science, Condensed matter physics, Mechanical Engineering, Materials Science (cond-mat.mtrl-sci), General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, Ferromagnetism, Mechanics of Materials, symbols, Condensed Matter::Strongly Correlated Electrons, Berry connection and curvature, 0210 nano-technology |
| الوصف: |
A large anomalous Nernst effect (ANE) is crucial for thermoelectric energy conversion applications because the associated unique transverse geometry facilitates module fabrication. Topological ferromagnets with large Berry curvatures show large ANEs; however, they face drawbacks such as strong magnetic disturbances and low mobility due to high magnetization. Herein, we demonstrate that YbMnBi2, a canted antiferromagnet, has a large ANE conductivity of ~10 A m−1 K−1 that surpasses large values observed in other ferromagnets (3–5 A m−1 K−1). The canted spin structure of Mn guarantees a non-zero Berry curvature, but generates only a weak magnetization three orders of magnitude lower than that of general ferromagnets. The heavy Bi with a large spin–orbit coupling enables a large ANE and low thermal conductivity, whereas its highly dispersive px/y orbitals ensure low resistivity. The high anomalous transverse thermoelectric performance and extremely small magnetization make YbMnBi2 an excellent candidate for transverse thermoelectrics. The anomalous Nernst effect (ANE) in topological materials with large Berry curvature shows great potential for transverse thermoelectrics, but antiferromagnets typically show small ANEs. The antiferromagnet YbMnBi2 has an ANE thermopower of 3 μV K−1, similar to ferromagnets, and a larger ANE conductivity. |
| تدمد: |
1476-1122 |
| DOI: |
10.1038/s41563-021-01149-2 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fce67becd112fe8a4afdca13c0d933f2 |
| Rights: |
OPEN |
| رقم الانضمام: |
edsair.doi.dedup.....fce67becd112fe8a4afdca13c0d933f2 |
| قاعدة البيانات: |
OpenAIRE |