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<p>Thermoelectrics (TEs) are solid-state devices that can realize heat-electricity conversion. Transverse TEs require materials with a large Nernst effect, which typically requires a strong applied magnetic field. However, topological materials with magnetic order offer an alternative pathway for achieving large Nernst via the anomalous Hall effect and the accompanying anomalous Nernst effect (ANE) that arise from band topology. Here, we show that YbMnBi<sub>2</sub> with a low Hall density and a chemical potential near the Weyl points has, to the best of our knowledge, the highest ANE-dominated Nernst thermopower of any magnetic material, with <i>S</i><sub><i>yx</i></sub> around 110 μV K<sup>-1</sup> (<i>T</i> = 254 K, 5 T ≤ |<i>μ</i><sub><i>0</i></sub><i>H</i> | ≤ 9 T applied along the spin canting direction), due to the synergism between classical contributions from filled electron bands, large Hall conductivity of topological origin, and large resistivity anisotropy. An appreciable thermal Hall angle of 0.02 &lt;<i>∇</i><sub><i>y</i></sub><i>T</i>/<i>∇</i><sub><i>x</i></sub><i>T</i> (−9 T) &lt; 0.06 was observed (40 K &lt; <i>T</i> &lt; 310 K).</p>

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Ultrahigh anomalous Nernst thermopower and thermal Hall angle in YbMnBi2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月4日

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  • Jiamin Wen,
  • Kaustuv Manna,
  • Dung Vu,
  • Subhadeep Bej,
  • Yu Pan,
  • Claudia Felser,
  • Brian Skinner,
  • Joseph P. Heremans

摘要

Thermoelectrics (TEs) are solid-state devices that can realize heat-electricity conversion. Transverse TEs require materials with a large Nernst effect, which typically requires a strong applied magnetic field. However, topological materials with magnetic order offer an alternative pathway for achieving large Nernst via the anomalous Hall effect and the accompanying anomalous Nernst effect (ANE) that arise from band topology. Here, we show that YbMnBi2 with a low Hall density and a chemical potential near the Weyl points has, to the best of our knowledge, the highest ANE-dominated Nernst thermopower of any magnetic material, with Syx around 110 μV K-1 (T = 254 K, 5 T ≤ |μ0H | ≤ 9 T applied along the spin canting direction), due to the synergism between classical contributions from filled electron bands, large Hall conductivity of topological origin, and large resistivity anisotropy. An appreciable thermal Hall angle of 0.02 <∇yT/∇xT (−9 T) < 0.06 was observed (40 K < T < 310 K).