Ultrahigh Anomalous Nernst Thermopower and Thermal Hall Angle in YbMnBi2
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908433292197888 |
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| author | Wen, Jiamin Manna, Kaustuv Vu, Dung Bej, Subhadeep Pan, Yu Felser, Claudia Skinner, Brian Heremans, Joseph P. |
| author_facet | Wen, Jiamin Manna, Kaustuv Vu, Dung Bej, Subhadeep Pan, Yu Felser, Claudia Skinner, Brian Heremans, Joseph P. |
| contents | 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 $S_{yx}$ around 110 $μ$V/K ($T$ = 254 K, 5 T < $|μ_0 H|$ < 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 $0.02 < (\nabla_y T)/(\nabla_x T) < 0.06$ was observed (40 K < $T$ < 310 K, $μ_0 H$ = 9 T). |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_20721 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultrahigh Anomalous Nernst Thermopower and Thermal Hall Angle in YbMnBi2 Wen, Jiamin Manna, Kaustuv Vu, Dung Bej, Subhadeep Pan, Yu Felser, Claudia Skinner, Brian Heremans, Joseph P. Materials Science 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 $S_{yx}$ around 110 $μ$V/K ($T$ = 254 K, 5 T < $|μ_0 H|$ < 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 $0.02 < (\nabla_y T)/(\nabla_x T) < 0.06$ was observed (40 K < $T$ < 310 K, $μ_0 H$ = 9 T). |
| title | Ultrahigh Anomalous Nernst Thermopower and Thermal Hall Angle in YbMnBi2 |
| topic | Materials Science |
| url | https://arxiv.org/abs/2506.20721 |