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We report large magnetoresistance (up to 55% at T=2.5K and H=8T) for polyaniline nanofiber networks. Magneto-transport behavior has been studied at low and high magnetic and electric fields for temperatures 2–250K. A crossover from positive magnetoresistance (MR) to negative MR is observed at ∼87.5K. Two competing mechanisms which account for the MR behavior are shrinkage of localized electron wavefunctions...
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