Magnetoresistance in phase separated La0.5Ca0.5MnO3 manganite

R. S. FREITAS; L. GHIVELDER; JOAQUIN SACANELL; P. LEVY; F. PARISI

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Elsevier

Año: 2004 vol. 272 p. 1745 - 1747

0304-8853

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.