Thermomagnetic properties of Bi2Te3 single crystal in the temperature range from 55 K to 380 K
Md S. Akhanda, S. Emad Rezaei, Keivan Esfarjani, Sergiy Krylyuk, Albert Davydov, Mona Zebarjadi
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.
, , S.
, Esfarjani, K.
, Krylyuk, S.
, Davydov, A.
and Zebarjadi, M.
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)