Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3593962
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- National Science Council of Taiwan, R.O.C. [NSC 98-2112-M-018-005-MY3]
- National Science Council of Taiwan
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We report measurements of electrical resistivity and thermopower on CaMnO3-delta and Ca0.98RE0.02MnO3-delta (RE=Sm, Gd, and Dy) prepared by solid state reaction. CaMnO3-delta 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. Ca0.98RE0.02MnO3-delta 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. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3593962]
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