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Investigation of activated transport in hole doped rare earth manganites in the high temperature paramagnetic regime
- Source :
-
Solid State Communications . May2006, Vol. 138 Issue 6, p318-323. 6p. - Publication Year :
- 2006
-
Abstract
- Abstract: Electronic transport in the high temperature paramagnetic regime of the colossal magnetoresistive oxides, La1−x A x MnO3, A=Ca, Sr, Ba, x≃0.1–0.3, has been investigated using resistivity measurements. The main motivation for this work is to relook into the actual magnitude of the activation energy for transport in a number of manganites and study its variation as a function of hole doping (x), average A-site cation radius (〈r A〉), cationic disorder (σ 2) and strain (ε zz ). We show that contrary to current practice, the description of a single activation energy in this phase is not entirely accurate. Our results clearly reveal a strong dependence of the activation energy on the hole doping as well as disorder. Comparing the results across different substituent species with different 〈r A〉 reveals the importance of σ 2 as a metric to qualify any analysis based on 〈r A〉. [Copyright &y& Elsevier]
- Subjects :
- *ELECTRON transport
*OXIDE minerals
*HIGH temperatures
*CATIONS
Subjects
Details
- Language :
- English
- ISSN :
- 00381098
- Volume :
- 138
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Solid State Communications
- Publication Type :
- Academic Journal
- Accession number :
- 20639492
- Full Text :
- https://doi.org/10.1016/j.ssc.2006.01.039