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Durham University

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Publication details for Professor Andy Monkman

PRATT, FL, VALLADARES, RM, PATTENDEN, PA, BLUNDELL, SJ, HAYES, W, MONKMAN, AP & NAGAMINE, K (1995). MU-SR STUDIES OF SPIN EXCITATIONS IN POLYANILINE. Synthetic Metals 69(1-3): 231-232.
  • Publication type: Journal Article
  • ISSN/ISBN: 0379-6779

Author(s) from Durham

Abstract

Muon techniques have been used to study the spill excitations in
polyaniline. The relaxation rate provides information about the spin
dynamics. 1D spin diffusion is observed at low temperature in
non-metallic materials with a crossover to 2 or 3D behaviour at higher
temperature. In metallic polyaniline, in contrast to the undoped cases,
the relaxation is rapidly quenched by field at all temperatures. Static
and dynamic terms in the relaxation can be separated. The dynamic term
shows a high field cutoff which occurs around 25 G at 20 K. This
relaxation behaviour indicates a broad spectrum of spin fluctuations
concentrated at frequencies in the region below 0.3 MHz. This is a
frequency region that is somewhat lower than previously studied by
other probes of spin dynamics.