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Polarization-Dependent Soft X-ray Absorption Spectroscopy Study of Layered Thermoelectric Cobalt Oxide: Bi2-xPbxSr2Co2O8+δ

Authors
J.-S. KangH. J. LeeG. KimS. W. HanT. FujiiI. TerasakiHangil LeJ.-Y. KimB. H. KimB. I. Min
Issue Date
Aug-2008
Publisher
The Korean Physical Society
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.53, no.2, pp.1010 - 1013
Journal Title
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Volume
53
Number
2
Start Page
1010
End Page
1013
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/148182
DOI
10.3938/jkps.53.1010
ISSN
0374-4884
Abstract
The electronic structures of Bi2xPbxSr2Co2O8+ (x = 0, 0.4, 0.6) thermoelectric single crystals have been investigated by using polarization-dependent soft X-ray absorption spectroscopy (XAS). The Co ions are found to be in the Co3+-Co4+ mixed-valence states with a low-spin conguration, and the lowest unoccupied states are found to have mainly an out-of-plane Co a1g character. With increasing x in Bi2xPbxSr2Co2O8+, all the peaks in the O 1s XAS spectra become broadened, suggesting that the improved thermoelectric property in Bi2xPbxSr2Co2O8+ for x > 0 is due to the enhanced delocalized character of Co a1g a1g hole carriers.
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