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Correlation Between the Electronic Structure and the Thermoelectric Properties of Gd-Doped CaMnO3−δ

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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 CaMnO3−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.

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Acknowledgments

This work was supported by National Science Council of R.O.C. under the Grant Nos. NSC 101-2112-M-018-003-MY3 (C.J.L.) and NSC 101-2112-M-032-005 (C.L.C.).

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Authors and Affiliations

  1. Department of Physics, National Changhua University of Education, Changhua, 500, Taiwan

    Chia-Jyi Liu & J.-J. Yuan

  2. Department of Physics, Tamkang University, Tamsui, New Taipei City, 251, Taiwan

    Wei-Cheng Wang, Mei-Huei Wu & Ching-Lin Chang

  3. National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan

    Jeng-Lung Chen

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  1. Chia-Jyi Liu
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  2. Wei-Cheng Wang
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  3. J.-J. Yuan
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Correspondence to Ching-Lin Chang.

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Liu, CJ., Wang, WC., Yuan, JJ. et al. Correlation Between the Electronic Structure and the Thermoelectric Properties of Gd-Doped CaMnO3−δ . J. Electron. Mater. 43, 2094–2098 (2014). https://doi.org/10.1007/s11664-013-2969-1

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  • DOI: https://doi.org/10.1007/s11664-013-2969-1

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