Elsevier, Journal of Magnetism and Magnetic Materials, (196-197), p. 536-538
DOI: 10.1016/s0304-8853(98)00882-8
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The giant negative magnetoresistance in manganites has been investigated from the Curie temperature Tc up to 600 K (2.6 Tc) in magnetic fields up to 8 T. Nonadiabatic small polaron hopping can successfully describe the temperature dependence of the resistivity. The magnetic field influence on the activation energy is explained by the interaction of unclustered ions with small spin clusters of four ions.