Band-filling dependence of thermoelectric properties in B20-type CoGe

N. Kanazawa, Y. Onose, Yuki Shiomi, S. Ishiwata, Y. Tokura

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9 Citations (Scopus)

Abstract

We have synthesized B20-type Co 1-xFe xGe and Co 1-yNi yGe by a high-pressure method and investigated the band-filling dependence of thermoelectric properties. CoGe shows a large figure of merit (ZT ≈ 0. 11) due to its low resistivity and large negative Seebeck coefficient (S) (- 82 V / K) at 300 K. The sign-crossover of S is observed with increasing Fe concentration. The Boltzmann transport model can explain semi-quantitatively the experimental results, from which we conclude that the large positive or negative S originates from the asymmetric band structure composed of the Dirac cone and the flat band with sharp bends around the Fermi energy.

Original languageEnglish
Article number093902
JournalApplied Physics Letters
Volume100
Issue number9
DOIs
Publication statusPublished - 2012 Feb 27

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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