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

Takenori Fujii; Ichiro Terasaki; Takao Watanabe; Azusa Matsuda

doi:10.1143/jjap.41.l783

Large in-plane anisotropy on resistivity and thermopower in the misfit layered oxide Bi_2-xPb_xSr₂Co₂O_y

Takenori Fujii^*, Ichiro Terasaki, Takao Watanabe, Azusa Matsuda

^*Corresponding author for this work

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

61 Citations (Scopus)

Abstract

We investigated the in-plane anisotropy on the resistivity and thermopower of Bi_2-xPb_xSr₂Co₂O_y 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 language	English
Pages (from-to)	L783-L786
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	41
Issue number	7 A
DOIs	https://doi.org/10.1143/jjap.41.l783
Publication status	Published - 2002 Jul 1
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/jjap.41.l783

Cite this

@article{f6ccc0acb580471eb07fb19e1d388383,

title = "Large in-plane anisotropy on resistivity and thermopower in the misfit layered oxide Bi2-xPbxSr2Co2Oy",

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.",

keywords = "In-plane anisotropy, In-plane resistivity, Layered cobalt oxide, Misfit structure, Thermopower",

author = "Takenori Fujii and Ichiro Terasaki and Takao Watanabe and Azusa Matsuda",

year = "2002",

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language = "English",

volume = "41",

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journal = "Japanese Journal of Applied Physics, Part 2: Letters",

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publisher = "Japan Society of Applied Physics",

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TY - JOUR

T1 - Large in-plane anisotropy on resistivity and thermopower in the misfit layered oxide Bi2-xPbxSr2Co2Oy

AU - Fujii, Takenori

AU - Terasaki, Ichiro

AU - Watanabe, Takao

AU - Matsuda, Azusa

PY - 2002/7/1

Y1 - 2002/7/1

N2 - 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.

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.

KW - In-plane anisotropy

KW - In-plane resistivity

KW - Layered cobalt oxide

KW - Misfit structure

KW - Thermopower

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