Thermoelectric properties of Bi$_{2}$Sr$_{2}$Co$_{2}$O$_{y}$ thin films grown by pulsed laser deposition

ORAL

Abstract

Epitaxial and c-axis preferred oriented oxide thermoelectric Bi$_{2}$Sr$_{2}$Co$_{2}$O$_{y}$ thin films have been deposited on LaAlO$_{3}$ (100), Al$_{2}$O$_{3 }$(0001) and fused silica substrates using pulsed laser deposition. At room temperature, the Seebeck coefficient and resistivity are of the order of 125 $\mu $V/K, 120 $\mu $V/K, 110 $\mu $V/K and 3 m$\Omega $ cm, 2 m$\Omega $ cm, 14 m$\Omega $ cm for the films on LaAlO$_{3}$ (100), Al$_{2}$O$_{3 }$(0001) and silica substrates respectively. A large negative in-plane magnetoresistance (MR) is observed in the films at low temperatures, with a MR reaching 41{\%} at 9 T and T=1.8 K in films on LaAlO$_{3}$ (100). We also observed a large bias current-dependent resistivity in the films at low temperature, which has been attributed to the suppression of spin-density-wave by electric field.

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Authors

  • Shufang Wang

    Department of Physics, The Pennsylvania State University, University Park, Pennsylvania, USA, The Pennsylvania State University, Department of Materials Science and Engineering, Penn State University, University Park, PA, USA

  • Venimadhav Adyam

    Department of Physics, The Pennsylvania State University, University Park, Pennsylvania, USA

  • Shengming Guo

    Department of Physics, The Pennsylvania State University, University Park, Pennsylvania, USA

  • Qi Li

    Department of Physics, The Pennsylvania State University, University Park, Pennsylvania, USA, Department of Physics, Penn State University, University Park, PA, USA

  • Xiaoxing Xi

    Department of Physics, The Pennsylvania State University, University Park, Pennsylvania, USA, The Pennsylvania State University, Department of Materials Science and Engineering, Penn State University, University Park, PA, USA, Pennsylvania State University