Thermoelectric Power in Transition-Metal Monosilicides

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  • Sakai Akihiro
    Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST) Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd.
  • Ishii Fumiyuki
    Graduate School of Natural Science and Technology, Kanazawa University
  • Onose Yoshinori
    ERATO, Japan Science and Technology Agency (JST), Multiferroics Project, c/o AIST Department of Applied Physics, The University of Tokyo
  • Tomioka Yasuhide
    Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST)
  • Yotsuhashi Satoshi
    Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd.
  • Adachi Hideaki
    Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd.
  • Nagaosa Naoto
    Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST) Department of Applied Physics, The University of Tokyo CREST, Japan Science and Technology Agency (JST)
  • Tokura Yoshinori
    Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST) ERATO, Japan Science and Technology Agency (JST), Multiferroics Project, c/o AIST Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd.

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Abstract

We study, both experimentally and theoretically, temperature and electron-density (band-filling) dependence of Seebeck coefficient in B20-type transition-metal monosilicides to critically study the validity of the Boltzmann transport theory based on the band structure as a guiding principle for the materials design of metallic thermoelectric compounds. The global thermoelectric phase diagram for a wide range of materials (CrSi–MnSi–FeSi–CoSi–Co0.85Ni0.15Si and their interpolating solid solutions) is obtained. Theoretical results derived from the calculated band structure can reproduce a global feature of experimental results except the higher temperature region of FeSi, providing the firm basis to understand the systematics of thermoelectricity in metallic compounds including the role of electron correlation and to develop the material design for larger thermoelectricity.

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