Jain, Himanshu (2006) Investigation of activated transport in hole doped rare earth manganites in the high temperature paramagnetic regime. In: Solid State Communications, 138 (6). 318 -323.
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Electronic transport in the high temperature paramagnetic regime of the colossal magnetoresistive oxides, La(1-x)A(x)MnO(3), A=Ca, Sr, Ba, x similar or equal to 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 (sigma(2)) and strain (epsilon(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 sigma(2) as a metric to qualify any analysis based on (r(A)). (c) 2006 Elsevier Ltd. All rights reserved.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Keywords:||A. Rare earth manganites; D. Electronic transport|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||13 Jul 2010 09:56|
|Last Modified:||19 Sep 2010 06:10|
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