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Thermopower and thermal conductivity of the electron-doped manganite La0.9Te0.1MnO3.
- Source :
- Journal of Applied Physics; 12/15/2006, Vol. 100 Issue 12, p123701, 4p, 4 Graphs
- Publication Year :
- 2006
-
Abstract
- The thermal properties and their relationship to the charge transport properties of an electron-doped manganite La<subscript>0.9</subscript>Te<subscript>0.1</subscript>MnO<subscript>3</subscript> were investigated. The resistivity and the Hall effect were measured. The magnetic-field dependence of Hall resistivity indicates that the carriers in La<subscript>0.9</subscript>Te<subscript>0.1</subscript>MnO<subscript>3</subscript> are electrons. The thermopower S and thermal conductivity κ were also measured. Above the metal-insulator transition temperature T<subscript>P</subscript>, a significant difference between the resistivity activation energy (E<subscript>ρ</subscript>=128.3 meV) and the thermopower activation energy (E<subscript>S</subscript>=14.7 meV) was observed, implying that the conductivity of La<subscript>0.9</subscript>Te<subscript>0.1</subscript>MnO<subscript>3</subscript> above T<subscript>P</subscript> was dominated by the small-polaron hopping. In the ferromagnetic region, it is found that S shows T<superscript>3/2</superscript> dependence, suggesting that the electron-magnon scattering strongly affects the low-temperature thermopower of La<subscript>0.9</subscript>Te<subscript>0.1</subscript>MnO<subscript>3</subscript>. The temperature dependence of thermal conductivity, κ(T), reveals that the phonon component (κ<subscript>ph</subscript>) is the major one. Moreover, in the paramagnetic region, a positive dκ/dT is observed, i.e., dκ/dT>0, which might be related to the local anharmonic lattice distortions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 100
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 23624583
- Full Text :
- https://doi.org/10.1063/1.2402030