Colossal Nernst power factor in topological semimetal NbSb2

Peng Li, Pengfei Qiu (), Qing Xu, Jun Luo, Yifei Xiong, Jie Xiao, Niraj Aryal, Qiang Li, Lidong Chen and Xun Shi ()
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Peng Li: Chinese Academy of Sciences
Pengfei Qiu: Chinese Academy of Sciences
Qing Xu: Chinese Academy of Sciences
Jun Luo: Chinese Academy of Sciences
Yifei Xiong: Chinese Academy of Sciences
Jie Xiao: Chinese Academy of Sciences
Niraj Aryal: Brookhaven National Laboratory
Qiang Li: Brookhaven National Laboratory
Lidong Chen: Chinese Academy of Sciences
Xun Shi: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Today solid-state cooling technologies below liquid nitrogen boiling temperature (77 K), crucial to quantum information technology and probing quantum state of matter, are greatly limited due to the lack of good thermoelectric and/or thermomagnetic materials. Here, we report the discovery of colossal Nernst power factor of 3800 × 10−4 W m−1 K−2 under 5 T at 25 K and high Nernst figure-of-merit of 71 × 10−4 K−1 under 5 T at 20 K in topological semimetal NbSb2 single crystals. The observed high thermomagnetic performance is attributed to large Nernst thermopower and longitudinal electrical conductivity, and relatively low transverse thermal conductivity. The large and unsaturated Nernst thermopower is the result of the combination of highly desirable electronic structures of NbSb2 having compensated high mobility electrons and holes near Fermi level and strong phonon-drag effect. This discovery opens an avenue for exploring material option for the solid-state heat pumping below liquid nitrogen temperature.

Date: 2022
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DOI: 10.1038/s41467-022-35289-z

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