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  Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb2

Pan, Y., Fan, F.-R., Hong, X., He, B., Le, C., Schnelle, W., et al. (2020). Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb2. Advanced Materials, 2003168, pp. 1-8. doi:10.1002/adma.202003168.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-9D6F-D Version Permalink: http://hdl.handle.net/21.11116/0000-0007-9D72-8
Genre: Journal Article

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 Creators:
Pan, Yu1, Author              
Fan, Feng-Ren1, Author              
Hong, Xiaochen2, Author
He, Bin1, Author              
Le, Congcong1, Author              
Schnelle, Walter3, Author              
He, Yangkun1, Author              
Imasato, Kazuki2, Author
Borrmann, Horst4, Author              
Hess, Congcong2, Author
Büchner, Bernd2, Author
Sun, Yan1, Author              
Fu, Chenguang1, Author              
Snyder, G. Jeffrey2, Author
Felser, Claudia5, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
4Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: 2D Fermi surfaces, anisotropy, Dirac bands, Zintl compounds
 Abstract: The emerging class of topological materials provides a platform to engineer exotic electronic structures for a variety of applications. As complex band structures and Fermi surfaces can directly benefit thermoelectric performance it is important to identify the role of featured topological bands in thermoelectrics particularly when there are coexisting classic regular bands. In this work, the contribution of Dirac bands to thermoelectric performance and their ability to concurrently achieve large thermopower and low resistivity in novel semimetals is investigated. By examining the YbMnSb2 nodal line semimetal as an example, the Dirac bands appear to provide a low resistivity along the direction in which they are highly dispersive. Moreover, because of the regular-band-provided density of states, a large Seebeck coefficient over 160 µV K−1 at 300 K is achieved in both directions, which is very high for a semimetal with high carrier concentration. The combined highly dispersive Dirac and regular bands lead to ten times increase in power factor, reaching a value of 2.1 mW m−1 K−2 at 300 K. The present work highlights the potential of such novel semimetals for unusual electronic transport properties and guides strategies towards high thermoelectric performance. © 2020 The Authors. Advanced Materials published by Wiley-VCH GmbH

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Language(s): eng - English
 Dates: 2020-12-092020-12-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/adma.202003168
 Degree: -

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Title: Advanced Materials
  Other : Adv. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: - Sequence Number: 2003168 Start / End Page: 1 - 8 Identifier: ISSN: 0935-9648
CoNE: https://pure.mpg.de/cone/journals/resource/954925570855