Electrical/thermal transport and electronic structure of the binary cobalt pnictides Co Pn 2 (Pn = As and Sb)

Yosuke Goto, Syuhei Miyao, Yoichi Kamihara, Masanori Matoba

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7 Citations (Scopus)

Abstract

We demonstrate the electrical and thermal transport properties of polycrystalline CoPn2 (Pn = As and Sb) between 300 and 900 K. CoAs2 shows semiconducting electrical transport up to 900 K, while CoSb2 exhibits degenerate conduction. Sign inversion of the Seebeck coefficient is observed at ∼310 and ∼400 K for CoAs2 and CoSb2, respectively. Thermal conductivity at 300 K is 11.7 Wm-1K-1 for CoAs2 and 9.4 Wm-1K-1 for CoSb2. The thermoelectric power factor of CoAs2 is ∼10 μWcm-1K-2, although the dimensionless figure of merit is limited to ∼0.1 due to relatively high thermal conductivity. Using electronic structure calculations, the band gap value is calculated to be 0.55 eV for CoAs2 and 0.26 eV for CoSb2.

Original languageEnglish
Article number067147
JournalAIP Advances
Volume5
Issue number6
DOIs
Publication statusPublished - 2015 Jun 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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