Abstract
We report measurements of electrical resistivity and thermopower on CaMnO3-δ and Ca0.98 RE0.02 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. Ca0.98 RE0.02 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 eg 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 | |
| Publication status | Published - 2011 May 23 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)
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High-temperature transport properties of Ca0.98 RE 0.02 MnO3-δ (RE=Sm, Gd, and Dy). / Liu, Chia-Jyi; Bhaskar, Ankam; Yuan, J. J.
In: Applied Physics Letters, Vol. 98, No. 21, 214101, 23.05.2011.Research output: Contribution to journal › Article
TY - JOUR
T1 - High-temperature transport properties of Ca0.98 RE 0.02 MnO3-δ (RE=Sm, Gd, and Dy)
AU - Liu, Chia-Jyi
AU - Bhaskar, Ankam
AU - Yuan, J. J.
PY - 2011/5/23
Y1 - 2011/5/23
N2 - We report measurements of electrical resistivity and thermopower on CaMnO3-δ and Ca0.98 RE0.02 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. Ca0.98 RE0.02 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 eg and O 2p states due to electron doping via partial substitution of lanthanides for Ca2+ and oxygen defects.
AB - We report measurements of electrical resistivity and thermopower on CaMnO3-δ and Ca0.98 RE0.02 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. Ca0.98 RE0.02 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 eg and O 2p states due to electron doping via partial substitution of lanthanides for Ca2+ and oxygen defects.
UR - http://www.scopus.com/inward/record.url?scp=79959401988&partnerID=8YFLogxK
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U2 - 10.1063/1.3593962
DO - 10.1063/1.3593962
M3 - Article
AN - SCOPUS:79959401988
VL - 98
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 21
M1 - 214101
ER -