Journal article

Muon-spin relaxation study of anisotropic charge carrier motion in polyphenylene vinylene-based polymers

SJ Blundell, FL Pratt, IM Marshall, CA Steer, W Hayes, A Husmann, C Fischmeister, RE Martin, AB Holmes

JOURNAL OF PHYSICS-CONDENSED MATTER | IOP PUBLISHING LTD | Published : 2002

Abstract

Muon-spin relaxation (μSR) experiments on the conducting polymers poly(2, 3-dibutoxy-1, 4-phenylene vinylene) and poly(2, 5-bis(dimethyloctylsilyl)-1, 4-phenylene vinylene) probe the dynamics of the highly mobile polarons created by the muon-implantation process in which muonium reacts with the polymer forming a radical state. The fluctuating spin density induced by the electronic spin defect rapidly diffusing up and down the chain leads to a characteristic relaxation, the temperature and field dependences of which permit the extraction of intrachain and interchain diffusion rates. The intrachain diffusion rate decreases with temperature and can be fitted to a model of phonon-limited transpo..

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