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

Yosuke Goto; Syuhei Miyao; Yoichi Kamihara; Masanori Matoba

doi:10.1063/1.4923087

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

Yosuke Goto, Syuhei Miyao, Yoichi Kamihara, Masanori Matoba

Department of Applied Physics and Physico-Informatics

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

We demonstrate the electrical and thermal transport properties of polycrystalline CoPn<inf>2</inf> (Pn = As and Sb) between 300 and 900 K. CoAs<inf>2</inf> shows semiconducting electrical transport up to 900 K, while CoSb<inf>2</inf> exhibits degenerate conduction. Sign inversion of the Seebeck coefficient is observed at ∼310 and ∼400 K for CoAs<inf>2</inf> and CoSb<inf>2</inf>, respectively. Thermal conductivity at 300 K is 11.7 Wm-1K-1 for CoAs<inf>2</inf> and 9.4 Wm-1K-1 for CoSb<inf>2</inf>. The thermoelectric power factor of CoAs<inf>2</inf> 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 CoAs<inf>2</inf> and 0.26 eV for CoSb<inf>2</inf>.

Original language	English
Article number	067147
Journal	AIP Advances
Volume	5
Issue number	6
DOIs	https://doi.org/10.1063/1.4923087
Publication status	Published - 2015 Jun 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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

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.",

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T1 - Electrical/thermal transport and electronic structure of the binary cobalt pnictides Co Pn 2 (Pn = As and Sb)

AU - Goto, Yosuke

AU - Miyao, Syuhei

AU - Kamihara, Yoichi

AU - Matoba, Masanori

PY - 2015/6/1

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N2 - 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.

AB - 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.

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