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Thermomagnetic properties of Bi2Te3 single crystal in the temperature range from 55 K to 380 K

Published

Author(s)

Md S. Akhanda, S. Emad Rezaei, Keivan Esfarjani, Sergiy Krylyuk, Albert Davydov, Mona Zebarjadi

Abstract

Magneto-thermoelectric transport provides an understanding of coupled electron-hole-phonon current in topological materials and has applications in energy conversion and cooling. In this work, we investigate the effects of an external magnetic field (< 3 T) and temperature (55 K to 380 K) on the Nernst coefficient, the magneto-Seebeck coefficient, and the magnetoresistance of single-crystalline Bi2Te3. Moreau's relation is employed to justify both the overall trend of the Nernst coefficient and the temperature at which the Nernst coefficient changes sign. We observe a non-linear relationship between the Nernst coefficient and the applied magnetic field in the temperature range of 55 K to 255 K. An increase in both the Nernst coefficient and the magneto-Seebeck coefficient is observed as the temperature is reduced which can be attributed to the increased mobility of the carriers at lower temperatures. First-principles density functional theory calculations were carried out to physically model the experimental data including electronic and transport properties. Simulation findings agreed with the experiments and provide a theoretical insight to justify the measurements.
Citation
Physical Review Materials
Volume
5

Keywords

Bi2Te3, magneto-thermoelectric transport, Nernst coefficient, magneto-Seebeck coefficient

Citation

Akhanda, M. , , S. , Esfarjani, K. , Krylyuk, S. , Davydov, A. and Zebarjadi, M. (2021), Thermomagnetic properties of Bi2Te3 single crystal in the temperature range from 55 K to 380 K, Physical Review Materials, [online], https://dx.doi.org/10.1103/PhysRevMaterials.5.015403 (Accessed April 19, 2021)
Created January 20, 2021, Updated March 1, 2021