Author/Authors :
Abou-Elazab، نويسنده , , T.F. and Migahed، نويسنده , , M.D and Park، نويسنده , , H. and Park، نويسنده , , Y.W. and MacNeillis، نويسنده , , P. and Rabenau، نويسنده , , T. and Roth، نويسنده , , S.، نويسنده ,
Abstract :
The magnetoresistance (MR) has been measured on polypyrrole doped with tetraethylammonium toluene-4-sulfonate (PPy(TOS), σRT=25 S/cm) and on polyacetylene ((CH)x, σRT=2×104 S/cm) in the temperature range from 1.3 to 4.2 K up to H=10 T. The data for PPy(TOS) show a positive MR, but for (CH)x samples they show a positive MR with a maximum, the position of which shifts towards lower fields as the temperature decreases. The obtained data are explained in terms of the effect of the magnetic field on the variable range hopping (VRH).
