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"Magnetoresistance in phase-separated La0.5Ca0.5MnO3 manganite"
R.S. Freitas, L. Ghivelder, J. Sacanell, P. Levy and F. Parisi
Proc. of the "International Conference on Magnetism" (ICM 2003), Rome, Italy, July 27-August 1, 2003. Ed. D. Fiorani and L. Pareti
J. Magn. Magn. Mater. 272-276(3) (2004) 1745-1747
We report measurements of magnetoresistance and magnetization in a polycrystalline La0.5Ca0.5MnO3 sample. The results show the way in which a magnetic field is applied may change the phase-separated nature of the compound, clearly distinguishing two different effects: domain alignment and field-induced ferromagnetic fraction enlargement. The latter is strongly enhanced in a field-cooled cooling experiment, giving rise to low resistivity values, and providing clear evidence for the percolative nature of the colossal magnetoresistance of manganites.
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