Magnetism-mediated thermoelectric performance of the Cr-doped bismuth telluride tetradymite

VANEY, JB, AMINORROAYA YAMINI, Sima, TAKAKI, H, KOBAYASHI, K, KOBAYASHI, N and MORI, T (2019). Magnetism-mediated thermoelectric performance of the Cr-doped bismuth telluride tetradymite. Materials Today Physics, 9, p. 100090.

[img]
Preview
PDF
AminorroayaYamini-MagnetismMediatedThermoelectric(VoR).pdf - Published Version
Creative Commons Attribution.

Download (2MB) | Preview
Official URL: https://www.sciencedirect.com/science/article/pii/...
Open Access URL: https://www.sciencedirect.com/science/article/pii/... (Published version)
Link to published version:: https://doi.org/10.1016/j.mtphys.2019.03.004
Related URLs:

    Abstract

    Enhancing the efficiency of thermoelectric materials has been practiced extensively by either improving the power factor or reducing the lattice thermal conductivity. Magnetism, and the magnetic moment–charged carrier interactions, has been suggested to enhance the efficiency of some compounds. Nevertheless, decoupling of the magnetic and the carrier concentration–related effects has never been achieved to prove once and for all, the importance of magnetism in thermoelectricity. Herein, we report improved quality criterion of bismuth telluride upon chromium substitution. The magnetic interactions with the magnetic moment carried by Cr atoms have increased the electrons' effective mass, enhancing the thermopower. Combined with the decrease in the lattice thermal conductivity, the overall performance of these compounds has been enhanced by 25% at constant carrier concentration, an improvement seldom observed. This is a robust enhancement principle because magnetic interactions are effective at high temperatures above the transition temperature, unlike magnon drag which is dependent on ordering and typically a low temperature phenomenon. Our results indicate that taking advantage of such relatively easily implemented magnetic doping effects along with existing strategies can lead to enhanced efficiency of thermoelectric materials.

    Item Type: Article
    Identification Number: https://doi.org/10.1016/j.mtphys.2019.03.004
    Page Range: p. 100090
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 20 May 2019 16:31
    Last Modified: 18 Mar 2021 05:17
    URI: http://shura.shu.ac.uk/id/eprint/24614

    Actions (login required)

    View Item View Item

    Downloads

    Downloads per month over past year

    View more statistics