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  Magneto-thermoelectric characterization of a HfTe5 micro-ribbon

Niemann, A. C., Gooth, J., Sun, Y., Thiel, F., Thomas, A., Shekhar, C., et al. (2019). Magneto-thermoelectric characterization of a HfTe5 micro-ribbon. Applied Physics Letters, 115(7): 072109, pp. 1-5. doi:10.1063/1.5116788.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-8CAB-E Version Permalink: http://hdl.handle.net/21.11116/0000-0004-8CAD-C
Genre: Journal Article

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Niemann, Anna Corinna1, Author
Gooth, Johannes2, Author              
Sun, Yan2, Author              
Thiel, Felix1, Author
Thomas, Andy1, Author
Shekhar, Chandra3, Author              
Süß, Vicky2, Author              
Felser, Claudia4, Author              
Nielsch, Kornelius1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: HfTe5 is a promising low-temperature thermoelectric material. Its thermoelectric power output has been investigated at different temperatures and with different dopants. Recently, research has focused on the nontrivial topological band structure of HfTe5. Whereas band structure simulations and angle-resolved photoemission spectroscopy experiments put HfTe5 at the transition between a weak and a strong topological insulator, observations of the chiral magnetic effect indicate that HfTe5 is instead a Dirac semimetal. In this study, we contribute to the investigation of transport phenomena in HfTe5 by magnetoresistance (MR) and magnetothermopower (MS) measurements on a single-crystalline HfTe5 microribbon measuring 20 μm × 2.1 μm × 0.7 μm, with a magnetic field applied perpendicular to the transport direction. Interestingly, we see an almost complete suppression of the thermopower for elevated magnetic fields at temperatures of T ≤ 100 K, while an increased magnetothermopower is observed for increasing magnetic fields at T ≥ 150 K. First, we analyze the magnetic field-dependence of the magnetoresistance and magnetothermopower for different temperatures and propose several possible transport mechanisms responsible for the vanishing magnetothermoelectric transport at low temperatures. Furthermore, we report on an increase in the thermoelectric power factor by up to 40 due to an applied magnetic field and for temperatures between 150 K and 300 K, which is the temperature range relevant for thermoelectric applications of HfTe5. © 2019 Author(s).

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Language(s): eng - English
 Dates: 2019-08-162019-08-16
 Publication Status: Published in print
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 Identifiers: DOI: 10.1063/1.5116788
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Title: Applied Physics Letters
Source Genre: Journal
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Pages: - Volume / Issue: 115 (7) Sequence Number: 072109 Start / End Page: 1 - 5 Identifier: -