High-temperature transport properties of Ca0.98 RE 0.02 MnO3-δ (RE=Sm, Gd, and Dy)

Chia Jyi Liu; Ankam Bhaskar; J. J. Yuan

doi:10.1063/1.3593962

High-temperature transport properties of Ca_0.98 RE _0.02 MnO₃-δ (RE=Sm, Gd, and Dy)

Chia Jyi Liu, Ankam Bhaskar, J. J. Yuan

Department of Physics

Research output: Contribution to journal › Article

50 Citations (Scopus)

Abstract

We report measurements of electrical resistivity and thermopower on CaMnO₃-δ and Ca_0.98 RE_0.02 MnO ₃-δ (RE=Sm, Gd, and Dy) prepared by solid state reaction. CaMnO3-δ exhibits nonmetal-like temperature dependence of resistivity while metal-like temperature dependence of thermopower. This inconsistency can be explained by the extrinsic carriers arising from oxygen defects using two-band model. Ca_0.98 RE_0.02 MnO₃-δ exhibits metal-like temperature dependence in both resistivity and thermopower. The transition to metal-like behavior resembles the case in degenerate semiconductors and can be attributed to an impurity band formation with characteristic of hybridized Mn 3d e_g and O 2p states due to electron doping via partial substitution of lanthanides for Ca2+ and oxygen defects.

Original language	English
Article number	214101
Journal	Applied Physics Letters
Volume	98
Issue number	21
DOIs	https://doi.org/10.1063/1.3593962
Publication status	Published - 2011 May 23

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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Liu, C. J., Bhaskar, A., & Yuan, J. J. (2011). High-temperature transport properties of Ca_0.98 RE _0.02 MnO₃-δ (RE=Sm, Gd, and Dy). Applied Physics Letters, 98(21), [214101]. https://doi.org/10.1063/1.3593962

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