Abstract
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 language | English |
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Pages (from-to) | 2094-2098 |
Number of pages | 5 |
Journal | Journal of Electronic Materials |
Volume | 43 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2014 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Materials Chemistry