  We report on the temperature and field dependence of resistance of
La0.7Sr0.3MnO3 thin films over a wide temperature range and in pulsed magnetic
fields up to 60 T. The epitaxial La0.7Sr0.3MnO3 thin films were deposited by
laser molecular beam epitaxy. High magnetic field magnetoresistance curves were
fitted by the Brillouin function, which indicated the existence of magnetically
polarized regions and the underlying hopping mechanism. The unsaturated
magnetoconductance was the most striking finding observed in pulsed magnetic
fields up to 60 T. These observations can deepen the fundamental understanding
of the colossal magnetoresistance in manganites with strong correlation of
transport properties and magnetic ordering.
