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Iron-based binary ferromagnets for transverse thermoelectric conversion

机译：用于横向热电转换的铁基二元铁磁体

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摘要

Aluminium- and gallium-doped iron compounds show a large anomalous Nernst effect owing to a topological electronic structure, and their films are potentially suitable for designing low-cost, flexible microelectronic thermoelectric generators.Thermoelectric generation using the anomalous Nernst effect (ANE) has great potential for application in energy harvesting technology because the transverse geometry of the Nernst effect should enable efficient, large-area and flexible coverage of a heat source. For such applications to be viable, substantial improvements will be necessary not only for their performance but also for the associated material costs, safety and stability. In terms of the electronic structure, the anomalous Nernst effect (ANE) originates from the Berry curvature of the conduction electrons near the Fermi energy(1,2). To design a large Berry curvature, several approaches have been considered using nodal points and lines in momentum space(3-10). Here we perform a high-throughput computational search and find that 25 percent doping of aluminium and gallium in alpha iron, a naturally abundant and low-cost element, dramatically enhances the ANE by a factor of more than ten, reaching about 4 and 6 microvolts per kelvin at room temperature, respectively, close to the highest value reported so far. The comparison between experiment and theory indicates that the Fermi energy tuning to the nodal web-a flat band structure made of interconnected nodal lines-is the key for the strong enhancement in the transverse thermoelectric coefficient, reaching a value of about 5 amperes per kelvin per metre with a logarithmic temperature dependence. We have also succeeded in fabricating thin films that exhibit a large ANE at zero field, which could be suitable for designing low-cost, flexible microelectronic thermoelectric generators(11-13).
机译：铝和镓掺杂的铁化合物由于具有拓扑电子结构而显示出很大的能斯特效应，它们的薄膜也可能适合设计低成本，柔性的微电子热电发生器。利用异常能斯特效应（ANE）进行热发电由于能斯特效应的横向几何形状应该能够高效，大面积且灵活地覆盖热源，因此具有在能量收集技术中应用的潜力。为了使这种应用可行，不仅需要对其性能进行实质性改进，而且还需要进行相关的材料成本，安全性和稳定性。在电子结构方面，能斯特反常效应（ANE）源自费米能量附近的传导电子的贝里曲率（1,2）。为了设计大的贝里曲率，已经考虑了几种在动量空间中使用节点和线的方法（3-10）。在这里，我们进行了高通量的计算搜索，发现自然富集且低成本的元素α铁中25％的铝和镓掺杂可将ANE的强度提高十倍以上，达到约4和6微伏。室温下的每开尔文分别接近报道的最高值。实验和理论之间的比较表明，费米能量调谐到节点腹板（由互连的节点线制成的扁平带结构）是横向热电系数大大提高的关键，达到每开尔文每安培5安培的值仪表具有对数温度依赖性。我们还成功地制造了在零场处表现出较大ANE的薄膜，这可能适合设计低成本，灵活的微电子热电发生器（11-13）。

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  • 来源
    《Nature》 |2020年第7806期|53-57|共5页
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    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan|Univ Tokyo Dept Phys Tokyo Japan|Japan Sci & Technol Agcy JST CREST Honcho Kawaguchi Saitama Japan;

    Kanazawa Univ Nanomat Res Inst Kanazawa Ishikawa Japan|RIKEN Ctr Emergent Matter Sci CEMS Wako Saitama Japan;

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan|Tohoku Univ Dept Phys Sendai Miyagi Japan;

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan|Japan Sci & Technol Agcy JST CREST Honcho Kawaguchi Saitama Japan;

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan;

    Univ Tokyo Dept Appl Phys Tokyo Japan;

    RIKEN Ctr Emergent Matter Sci CEMS Wako Saitama Japan;

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan|Japan Sci & Technol Agcy JST CREST Honcho Kawaguchi Saitama Japan|Univ Tokyo Trans Scale Quantum Sci Inst Tokyo Japan;

    Japan Sci & Technol Agcy JST CREST Honcho Kawaguchi Saitama Japan|RIKEN Ctr Emergent Matter Sci CEMS Wako Saitama Japan|Univ Tokyo Dept Appl Phys Tokyo Japan;

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan|Univ Tokyo Dept Phys Tokyo Japan|Japan Sci & Technol Agcy JST CREST Honcho Kawaguchi Saitama Japan|Univ Tokyo Trans Scale Quantum Sci Inst Tokyo Japan|Johns Hopkins Univ Inst Quantum Matter Baltimore MD 21218 USA|Johns Hopkins Univ Dept Phys & Astron Baltimore MD 21218 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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