  We present our studies on polycrystalline samples of fluorine doped LaMnO3
(LaMnO3-yFy). LaMnO2.5F0.5 exhibits remarkable magnetic and electrical
properties. It shows ferromagnetic and metallic behavior with a high Curie
temperature of ~ 239 K and a high magnetoresistance of -64. This drastic change
in magnetic properties in comparison to pure LaMnO3 is ascribed to the presence
of mixed-valence Mn ions driven by the F-doping at the O-sites, which enables
double exchange (DE) in LMOF. Furthermore, the resistivity data exhibits two
resistivity peaks at 239 K and 213 K, respectively. Our results point towards
the possibility of multiple double exchange hopping paths of two distinct
resistances existing simultaneously in the sample below 213 K.
