Correlation between the electronic structure and the thermoelectric properties of Gd-doped CaMnO3-δ

Chia Jyi Liu, Wei Cheng Wang, J. J. Yuan, Jeng Lung Chen, Mei Huei Wu, Ching Lin Chang

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We report x-ray absorption near edge structure (XANES) on bulk samples of Ca1-x Gd x MnO3+δ with x = 0, 0.02, and 0.05. The transport properties measurements indicate that both resistivity and the absolute value of thermopower decrease with increasing x. Meanwhile, the temperature dependence of resistivity changes from non-metallic CaMnO 3-δ to metallic for samples of x = 0.02 and 0.05. XANES spectra at the O K-edge, Mn L 2,3-edge, and Ca L 2,3-edge indicate that Mn 3d-O 2p hybridization increases considerably, and unoccupied (3d-4s) states of Ca decrease with increasing substitution content. The increases of Mn 3d-O 2p hybridization might be responsible for the decrease of the resistivity and the absolute value of thermopower upon partial Gd substitution for Ca.

Original languageEnglish
Pages (from-to)2094-2098
Number of pages5
JournalJournal of Electronic Materials
Issue number6
Publication statusPublished - 2014


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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