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Durham University

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Publication details for Professor Andy Monkman

Pratt, FL, Ishida, K, Nagamine, K, Pattenden, PA, Jestadt, T, Chow, KH, Blundell, SJ, Hayes, W & Monkman, AP (1997). Muon studies of spin dynamics in polyaniline. Synthetic Metals 84(1-3): 943-944.
  • Publication type: Journal Article
  • ISSN/ISBN: 0379-6779
  • Keywords: polyaniline and derivativesPOLYACETYLENE

Author(s) from Durham

Abstract

The muon is a valuable probe of spin excitations in polymers, as the
muon implantation process itself generates a lest excitation whose
dynamical properties can be studied via the evolution of the muon spin
polarisation. We report here studies on undoped polyaniline in its
emeraldine base form (PANI:EB). Characteristic field dependences and
cutoff frequencies for the muon spin relaxation are observed which are
related to the spin diffusion. One-dimensional diffusion is seen at low
temperatures and at short probe times. The on chain diffusion is
observed to have a weak metallic temperature dependence whereas the
interchain diffusion is strongly activated and phenyl ring rotations
are seen to have an important effect on the diffusion processes.