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Volumn 76, Issue 8, 2007, Pages

"Pudding mold" band drives large thermopower in Na xCoO2

Author keywords

Band structure; NaxCoO2; Thermopower

Indexed keywords


EID: 34547862416     PISSN: 00319015     EISSN: 13474073     Source Type: Journal    
DOI: 10.1143/JPSJ.76.083707     Document Type: Article
Times cited : (265)

References (35)
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  • 21
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    • The origin of the strong enhancement of the power factor differs from the common knowledge that a parabolic band with large effective mass m* gives a large thermopower. For a fixed carrier density, the thermopower for the parabolic band is proportional to m*, 22 but this can be attributed solely to K0 ∝ σ ∝ 1/m*, while K1 is independent of m*. Thus, the power factor ∝ K1 2/K0 is only proportional to the resistivity. By contrast, in the pudding mold case, the flat portion of the band contributes to an increase of K1, so that an increase of only a factor of 2 in the resistivity can result in a power factor 10 times larger
    • 1, so that an increase of only a factor of 2 in the resistivity can result in a power factor 10 times larger.
  • 34
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    • 21
    • 21)
  • 35
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    • The deviation of ρ and α from the experiments below 50 K is due to the divergence of τ(k) at very low temperatures, which should not occur in actual materials.
    • The deviation of ρ and α from the experiments below 50 K is due to the divergence of τ(k) at very low temperatures, which should not occur in actual materials.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.