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- Title
Magnetic Field‐Enhanced Thermoelectric Performance in Dirac Semimetal Cd<sub>3</sub>As<sub>2</sub> Crystals with Different Carrier Concentrations.
- Authors
Wang, Honghui; Luo, Xigang; Peng, Kunling; Sun, Zeliang; Shi, Mengzhu; Ma, Donghui; Wang, Naizhou; Wu, Tao; Ying, Jianjun; Wang, Zhengfei; Chen, Xianhui
- Abstract
The magneto‐thermoelectric figure of merit (ZT) in crystals of the topological Dirac semimetal Cd3As2 with different carrier concentrations is studied. The ZTs for all the crystals increase with the temperature and show maxima at high temperatures. Meanwhile, the temperatures corresponding to the ZT maxima increase with the carrier concentration. The limit to the improvement in ZT(T) at high temperature could be related to the unusual large enhancement in thermal conductivity at elevated temperatures. The bipolar effect and Dirac liquid behavior are presented as processes possibly responsible for the peculiar behavior of the thermal conductivity. Applying a transverse magnetic field initially leads to a dramatic enhancement and, subsequently, to a slight reduction in ZT for all the crystals. The maximum ZT achieved in a magnetic field increases with the carrier concentration and reaches 1.24 at 450 K in a magnetic field of 9 T for the crystal with the highest carrier concentration. It is expected that this work will be beneficial to the current interests in optimizing the thermoelectric properties of quantum topological materials.
- Subjects
CARRIER density; SEMIMETALS; CRYSTALS; HIGH temperatures; MAGNETIC fields; THERMAL conductivity
- Publication
Advanced Functional Materials, 2019, Vol 29, Issue 37, pN.PAG
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201902437