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Large Nernst power factor over a broad temperature range in polycrystalline Weyl semimetal NbP

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Abstract

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.

Graphical abstract: Large Nernst power factor over a broad temperature range in polycrystalline Weyl semimetal NbP

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Publication details

The article was received on 16 Jul 2018, accepted on 14 Aug 2018 and first published on 14 Aug 2018


Article type: Communication
DOI: 10.1039/C8EE02077A
Citation: Energy Environ. Sci., 2018, Advance Article
  • Open access: Creative Commons BY license
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    Large Nernst power factor over a broad temperature range in polycrystalline Weyl semimetal NbP

    C. Fu, S. N. Guin, S. J. Watzman, G. Li, E. Liu, N. Kumar, V. Süβ, W. Schnelle, G. Auffermann, C. Shekhar, Y. Sun, J. Gooth and C. Felser, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C8EE02077A

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