Abstract
We have studied the effect of charge carrier spin-magnetic ion interactions on charge transport in inhomogeneous polymers where the highly-conducting regions of the material order magnetically. This is the case for example in heavily FeCl 3-doped (CH) x or in polymer composites consisting of a magnetic metal or a magnetic semiconductor embedded in an insulating polymer. Our calculated results show that when the conduction is dominated by thin potential barriers as in the fluctuation-induced tunnelling mechanism, the changes in magnetic order due to temperature or magnetic field cause large changes in resistivity. The possibility that the present mechanism can explain the measured positive magnetoresistance in FeCl 3-doped (CH) x is discussed.
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