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Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn6Sn6
Advanced Materials ( IF 27.4 ) Pub Date : 2022-08-18 , DOI: 10.1002/adma.202201350 Subhajit Roychowdhury 1 , Andrew M Ochs 2 , Satya N Guin 3 , Kartik Samanta 1 , Jonathan Noky 1 , Chandra Shekhar 1 , Maia G Vergniory 4 , Joshua E Goldberger 2 , Claudia Felser 1
Advanced Materials ( IF 27.4 ) Pub Date : 2022-08-18 , DOI: 10.1002/adma.202201350 Subhajit Roychowdhury 1 , Andrew M Ochs 2 , Satya N Guin 3 , Kartik Samanta 1 , Jonathan Noky 1 , Chandra Shekhar 1 , Maia G Vergniory 4 , Joshua E Goldberger 2 , Claudia Felser 1
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Kagome magnets possess several novel nontrivial topological features owing to the strong correlation between topology and magnetism that extends to their applications in the field of thermoelectricity. Conventional thermoelectric (TE) devices use the Seebeck effect to convert heat into electrical energy. In contrast, transverse thermoelectric devices based on the Nernst effect are attracting recent attention due to their unique transverse geometry, which uses a single material to eliminate the need for a multitude of electrical connections compared to conventional TE devices. Here, a large anomalous transverse thermoelectric effect of ≈2 µV K−1 at room temperature in a kagome antiferromagnet YMn6Sn6 single crystal is obtained. The obtained value is larger than that of state-of-the-art canted antiferromagnetic (AFM) materials and comparable with ferromagnetic systems. The large anomalous Nernst effect (ANE) can be attributed to the net Berry curvature near the Fermi level. Furthermore, the ANE of the AFM YMn6Sn6 exceeds the magnetization scaling relationship of conventional ferromagnets. The results clearly illustrate that AFM material YMn6Sn6 is an ideal topological material for room-temperature transverse thermoelectric applications.
中文翻译：
Kagome 反铁磁体 YMn6Sn6 中的大室温异常横向热电效应
Kagome 磁体由于拓扑和磁性之间的强相关性而具有几个新颖的非平凡拓扑特征，这延伸到它们在热电领域的应用。传统的热电 (TE) 设备使用塞贝克效应将热量转化为电能。相比之下，基于能斯特效应的横向热电器件由于其独特的横向几何形状而引起了最近的关注，与传统的热电器件相比，它使用单一材料消除了对大量电连接的需求。这里，在kagome反铁磁体YMn 6 Sn 6中，室温下≈2 µV K -1的大异常横向热电效应得到单晶。获得的值大于最先进的倾斜反铁磁 (AFM) 材料的值，并且可与铁磁系统相媲美。大的异常能斯特效应 (ANE) 可归因于费米能级附近的净贝里曲率。此外，AFM YMn 6 Sn 6的 ANE超过了传统铁磁体的磁化比例关系。结果清楚地表明AFM材料YMn 6 Sn 6是室温横向热电应用的理想拓扑材料。
更新日期：2022-08-18
中文翻译：
Kagome 反铁磁体 YMn6Sn6 中的大室温异常横向热电效应
Kagome 磁体由于拓扑和磁性之间的强相关性而具有几个新颖的非平凡拓扑特征，这延伸到它们在热电领域的应用。传统的热电 (TE) 设备使用塞贝克效应将热量转化为电能。相比之下，基于能斯特效应的横向热电器件由于其独特的横向几何形状而引起了最近的关注，与传统的热电器件相比，它使用单一材料消除了对大量电连接的需求。这里，在kagome反铁磁体YMn 6 Sn 6中，室温下≈2 µV K -1的大异常横向热电效应得到单晶。获得的值大于最先进的倾斜反铁磁 (AFM) 材料的值，并且可与铁磁系统相媲美。大的异常能斯特效应 (ANE) 可归因于费米能级附近的净贝里曲率。此外，AFM YMn 6 Sn 6的 ANE超过了传统铁磁体的磁化比例关系。结果清楚地表明AFM材料YMn 6 Sn 6是室温横向热电应用的理想拓扑材料。
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