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Title: High-temperature Transport Properties of Ca0.98RE0.02MnO3-δ (RE = Sm, Gd and Dy)
Authors: Liu, Chia-Jyi;Bhaskar, Ankam;Yuan, J. J.
Contributors: 物理學系
Date: 2011
Issue Date: 2012-09-10T06:17:00Z
Publisher: American Institute of Physics
Abstract: We report measurements of electrical resistivity and thermopower on CaMnO3−δ and Ca0.98RE0.02MnO3−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. Ca0.98RE0.02MnO3−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 eg and O 2p states due to electron doping via partial substitution of lanthanides for Ca2+ and oxygen defects.
Relation: Appl. Phys. Lett., 98(21): 214101-214103
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