Abstract
We found the giant negative magnetoresistance in the one-dimensional π-d system TPP[Fe(Pc)(CN)2]2 below 50K. The large negative magnetoresistance was observed for the field along the a-axis, while the small one along the c-axis. We also observed the anisotropic Curie behavior of the magnetic susceptibility. The large (small) magnetoresistance was observed in the field orientation for the large (small) magnetic susceptibility. The reduction of the spin-flip scattering of the itinerant electrons by the local moments under the magnetic field was proposed as the origin of the negative magnetoresistance. In the isostructural compound TPP[Co(Pc)(CN)2]2 we observed the large positive magnetoresistance. This positive magnetoresistance cannot be explained in terms of the orbital effects under the field.
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