Nodal line induced large transverse thermoelectric response in the D03-type Heusler compound Fe3Si

IF 3.1 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Susumu Minami, Sota Hogaki, Takahiro Shimada
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引用次数: 0

Abstract

Giant magnetic transverse thermoelectric effect, anomalous Nernst effect (ANE), was theoretically and experimentally observed in 3d-transition metal compounds. The intrinsic components of ANE can be described from the electronic structure based on the Berry phase concept. The topological electronic structure, such as the Weyl node and nodal lines, induces large Berry curvature, one origin of giant ANE. We investigated transverse thermoelectric properties on ferromagnetic D03-type Heusler compounds Fe3Si based on first-principles calculations. We found large transverse thermoelectric conductivity αxy5AK1m1 is realized with hole carrier doping at room temperature. We also clarified that the nodal line and its stationary point enhance transverse thermoelectric conductivity. These results give us a clue to design high-performance ANE-based magnetic thermoelectric materials.

Abstract Image

D03 型 Heusler 化合物 Fe3Si 中节点线诱导的大横向热电响应
在 3d 过渡金属化合物中从理论和实验上观测到了巨磁横向热电效应,即反常奈恩斯特效应(ANE)。ANE 的内在成分可以根据贝里相概念从电子结构中描述出来。拓扑电子结构,如韦尔节点和节点线,会诱发大贝里曲率,这是巨型 ANE 的起源之一。我们基于第一原理计算研究了铁磁性 D03 型 Heusler 化合物 Fe3Si 的横向热电特性。我们发现,在室温下掺杂空穴载流子时,可实现较大的横向热电导率 αxy∼5AK-1m-1。我们还阐明了节点线及其静止点可提高横向热电导率。这些结果为我们设计基于 ANE 的高性能磁性热电材料提供了线索。
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来源期刊
Physical Review Materials
Physical Review Materials Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
5.80
自引率
5.90%
发文量
611
期刊介绍: Physical Review Materials is a new broad-scope international journal for the multidisciplinary community engaged in research on materials. It is intended to fill a gap in the family of existing Physical Review journals that publish materials research. This field has grown rapidly in recent years and is increasingly being carried out in a way that transcends conventional subject boundaries. The journal was created to provide a common publication and reference source to the expanding community of physicists, materials scientists, chemists, engineers, and researchers in related disciplines that carry out high-quality original research in materials. It will share the same commitment to the high quality expected of all APS publications.
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