Large in-plane anisotropy on resistivity and thermopower in the misfit layered oxide Bi2-xPbxSr2Co2Oy

Takenori Fujii, Ichiro Terasaki, Takao Watanabe, Azusa Matsuda

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

We investigated the in-plane anisotropy on the resistivity and thermopower of Bi2-xPbxSr2Co2Oy single crystals, which have a misfit structure between the hexagonal CoO2 layer and the rock salt Bi2Sr2O4 layer. The resistivity and thermopower show significant anisotropy, which exceeds two at maximum. This anisotropy is thought to arise from the anisotropic pseudogap formation enhanced by the misfit structure. The thermopower changes with Pb doping to take a maximum at x = 0.4. The misfit structure improves the thermoelectric properties through chemical pressure. The power factor is as large as 9 μW/cm·K2 at 100 K for x = 0.6, which is the highest value obtained for thermoelectric oxides at 100 K.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume41
Issue number7 A
Publication statusPublished - 2002 Jul 1
Externally publishedYes

Fingerprint

Thermoelectric power
Anisotropy
anisotropy
electrical resistivity
Oxides
oxides
halites
chemical properties
Rocks
Doping (additives)
Single crystals
Salts
single crystals

Keywords

  • In-plane anisotropy
  • In-plane resistivity
  • Layered cobalt oxide
  • Misfit structure
  • Thermopower

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Large in-plane anisotropy on resistivity and thermopower in the misfit layered oxide Bi2-xPbxSr2Co2Oy . / Fujii, Takenori; Terasaki, Ichiro; Watanabe, Takao; Matsuda, Azusa.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 41, No. 7 A, 01.07.2002.

Research output: Contribution to journalArticle

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AB - We investigated the in-plane anisotropy on the resistivity and thermopower of Bi2-xPbxSr2Co2Oy single crystals, which have a misfit structure between the hexagonal CoO2 layer and the rock salt Bi2Sr2O4 layer. The resistivity and thermopower show significant anisotropy, which exceeds two at maximum. This anisotropy is thought to arise from the anisotropic pseudogap formation enhanced by the misfit structure. The thermopower changes with Pb doping to take a maximum at x = 0.4. The misfit structure improves the thermoelectric properties through chemical pressure. The power factor is as large as 9 μW/cm·K2 at 100 K for x = 0.6, which is the highest value obtained for thermoelectric oxides at 100 K.

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