Ordering of polarons in Pr0.5Ca0.5MnO3
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A. Levstika, 
, 
, C. Filipiča, V. Bobnara, S. Drnovšeka, J. Holca, Z. Tronteljb and Z. Jagličićb, c
Received 23 December 2009;
revised 11 March 2010;
accepted 31 March 2010.
by J. Fontcuberta.
Available online 7 April 2010.
Abstract
We report detailed dielectric investigations of Pr1−xCaxMnO3 (PCMO, x=0.5) ceramics, a member of the perovskite manganite family that exhibits a colossal magnetoresistance. Analysis of the electrical conductivity and dielectric constant data revealed that in the low temperature phase, below 42 K, small polarons are responsible for the charge transport in the system. This provides a new understanding of the phase diagrams in PCMO systems
