Metallic state in elongated PF6−-doped polypyrrole

Using highly conducting elongated PF6−-doped polypyrrole, the anisotropy of resistivity and magnetoresistance, together with the temperature dependence of resistivity and Hall effect have been measured. The magnetoresistance is positive with magnetic field applied in all the directions and does not show any saturation up to 15 T field. The Hall coefficient is negative and its magnitude is one order of magnitude smaller than that in unstretched sample.