Comparison of magnetotransport properties of nano- and microcrystalline La0.7Ca0.3MnO3 manganites in high magnetic field

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Department of Chemistry, University of Warsaw, Al. Zwirki i Wigury 101, PL-02-089 Warsaw, Poland [1 ]
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Journal of Applied Physics | 2008年 / 104卷 / 12期
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The nanocrystalline (mean grain size 20 nm) and microcrystalline magnetoresistive manganites with composition La0.7Ca 0.3MnO3 were studied using a four probe electrical resistivity measurement in a strong magnetic field. The room temperature values of electrical resistivity are found to be 20 times larger for the nanocrystalline than for the microcrystalline sample; and therefore show a remarkable influence of fine grain microstructure. Such a difference reveals a more intense electron scattering inside the structurally and magnetically disordered grain boundaries in the nanocrystalline material than in the microcrystalline material. A pulsed magnetic field of 47 T reduces electrical resistivity three and eight times for the nano- and microcrystalline samples; respectively; and causes a monotonic shift of the transition temperature from Tp=150 to 180 K in nanocrystalline manganite. In the microcrystalline sample Tp shifts only from 250 to 270 K. The temperature dependencies of electrical resistivity above Tp confirm that the polaronic model is applicable up to 47 T. The activation energy of the microcrystalline manganite decreases from about 2000 K down to 300 K between the 0 and 47 T. The high field activation energy of the nanocrystalline manganite is twice as large as that of the microcrystalline manganite. The strong negative magnetoresistance effect in both nano- and microcrystalline manganites reaches about 90% at 47 T in different temperature ranges. Most abrupt changes of magnetoresistance occurring at the lowest temperatures in magnetic fields up to 2 T are followed by a relatively slower approach to saturation at stronger fields for both microstructures. The magnetoresistance hysteresis found in the nanocrystalline manganite at low temperatures is related to the magnetization hysteresis appearing at relatively weak magnetic fields. The saturation magnetization in the grain bulk and grain boundaries is determined. The influence of magnetic viscosity effects on electrical resistivity of the nanocrystalline manganite is also analyzed. © 2008 American Institute of Physics;
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