The discovery of topological materials has provided new opportunities to exploit advanced materials for heat-to-electricity energy conversion as they share many common characteristics with thermoelectric materials. In this work, we report the magneto-thermoelectric properties and Nernst effect of the topological Weyl semimetal NbP. We find that polycrystalline, bulk NbP shows a significantly larger Nernst thermopower than its conventional thermopower under magnetic field. As a result, a maximum Nernst power factor of ∼35 × 10⁻⁴ W m⁻¹ K⁻² is achieved at 9 T and 136 K, which is 4 times higher than its conventional power factor and is also comparable to that of state-of-the-art thermoelectrics. Moreover, the Nernst power factor maintains relatively large value over a broad temperature range. These results highlight that the enhancement of thermoelectric performance can be achieved in topological semimetals based on the Nernst effect and transverse transport.

中文翻译：

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多晶Weyl半金属NbP中在较大温度范围内的大能斯特功率因数†

拓扑材料的发现为开发用于热电能量转换的高级材料提供了新的机会，因为它们与热电材料具有许多共同的特征。在这项工作中，我们报告了拓扑Weyl半金属NbP的磁热电性质和能斯特效应。我们发现，在磁场作用下，多晶块状NbP的Nernst热功率比其常规热功率大得多。结果，最大能斯特功率因数约为35×10 ^-4 W m ^-1 K ^-2在9 T和136 K时可实现最大输出功率，这是其常规功率因数的4倍，并且也可与最新的热电器件相媲美。此外，能斯特功率因数在较宽的温度范围内保持相对较大的值。这些结果表明，基于能斯特效应和横向迁移，可以在拓扑半金属中实现热电性能的增强。