Giant negative magnetoresistance in quasi-one-dimensional conductor TPP[Fe(Pc)(CN)(2)](2): Interplay between local moments and one-dimensional conduction electrons

We have found giant negative magnetoresistance in the one-dimensional condu ctor TPP[Fe(Pc)(CN)(2)](2) below 50 K. The reduction of the resistance is l arger in the field perpendicular to the one-dimensional axis than parallel to the axis. The magnetic susceptibility shows anisotropic Curie-Weiss beha vior. The experimental results suggest the interaction between the one-dime nsional electron system and the local moments. The reduction of the spin sc attering of the itinerant electrons by the local moments under the field is proposed as the origin of the giant negative magnetoresistance.