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

Md Sabbir Akhanda, S. Emad Rezaei, Keivan Esfarjani, Sergiy Krylyuk, Albert V. Davydov, and Mona Zebarjadi
Phys. Rev. Materials 5, 015403 – Published 21 January 2021
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Abstract

Magnetothermoelectric 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 study the Nernst coefficient, the magneto-Seebeck coefficient, and the magnetoresistance of single-crystalline Bi2Te3 under external magnetic field in the range of 3T to 3 T and in the temperature range of 55 K to 380 K. Moreau's relation is employed to justify both the overall trend of the Nernst coefficient and the temperature at which this coefficient changes sign. We observe a nonlinear 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.

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  • Received 5 October 2020
  • Accepted 6 January 2021

DOI:https://doi.org/10.1103/PhysRevMaterials.5.015403

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Md Sabbir Akhanda and S. Emad Rezaei

  • Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, Virginia 22904, USA

Keivan Esfarjani

  • Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, USA; Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA; and Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA

Sergiy Krylyuk and Albert V. Davydov

  • Material Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

Mona Zebarjadi

  • Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, Virginia 22904, USA and Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, USA

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Issue

Vol. 5, Iss. 1 — January 2021

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