Low-temperature magnetoresistance of heavily FeCl3-doped polyacetylene: Hopping conduction among localized states with Coulomb correlation

Abstract The positive magnetoresistance of disordered fully-FeCl 3 -doped polyacetylene showed a pronounced maximum near 2 T below 4.2 K. This contrasts with the magnetoresistance for disordered I 2 -doped sample showing a dull maximum. The results are analyzed in terms of the magnetic field effect to the hopping conduction among Anderson-localized states with Coulomb correlation. The difference by the dopant species is ascribed to the depth of the Fermi level from the mobility edge.