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"Correlation between electrical and magnetic properties of phase-separated manganites studied with a general effective medium model"
J. Sacanell, M. Quintero, F. Parisi, L. Ghivelder, A.G. Leyva and P. Levy
Proc. of the Workshop "At the Frontiers of Condensed Matter III - New Trends in Structural, Electronic and Magnetic Properties of Matter", Centro Atómico Constituyentes-CNEA, Buenos Aires, Argentina, December 11-15, 2006. Ed. J. Guevara, A.M. Llois, G. Lozano and R. Weht
Physica B Condens. Matter. 398(2) (2007) 238-240
We have performed electrical resistivity and DC magnetization measurements as a function of temperature, on polycrystalline samples of phase-separated La5/8-yPryCa3/8MnO3 (y=0.3). We have used the general effective medium theory to obtain theoretical resistivity vs. temperature curves corresponding to different fixed ferromagnetic (FM) volume fraction values, assuming that the sample is a mixture of typical metallic-like and insulating manganites. By comparing this data with our experimental resistivity curves we have obtained the relative FM volume fraction of our sample as a function of temperature. This result matches with the corresponding magnetization data in excellent agreement, showing that a mixed-phase scenario is the key element to explain both the magnetic and transport properties in the present compound.
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