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Polarization-Dependent Soft X-ray Absorption Spectroscopy Study of Layered Thermoelectric Cobalt Oxide: Bi2-xPbxSr2Co2O8+δ
- Authors
- J.-S. Kang; H. J. Lee; G. Kim; S. W. Han; T. Fujii; I. Terasaki; Hangil Le; J.-Y. Kim; B. H. Kim; B. 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
- Pages
- 4
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 53
- Number
- 2
- Start Page
- 1010
- End Page
- 1013
- ISSN
- 0374-4884
1976-8524
- 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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