We report the unusual transport properties found inLa2/3MnO3−&dgr;thin films onAl2O3 (11¯02).Powder x-ray diffraction shows that the film has a mixture of perpendicular (110) and (001) crystal orientations. Unlike epitaxial or polycrystallineLa1−xMnO3−&dgr;samples, in which the peak resistance temperatureTpshifts toward a higher temperature under the influence of magnetic field, theTpof this particular film remains almost the same even in fields up to 5 T. The film becomes insulating at a low temperatureTm(∼45&hthinsp;K),but the trend is reversed by the applied magnetic field. ©1998 American Institute of Physics.