Abstract
ESR spectra of MWNTs have been studied with isochronal annealing and temperature dependence down to 100 K . Two closely spaced peaks are observed in the ESR signals. The higher-field signal disappears after thermal annealing at 500°C and can be related to the presence of contaminations and /or defects in the MWNTs. However, the lower-field signal is thought to be associated with free carriers in the carbon nanotube and the transport relaxation time can be expected to decrease roughly by one-third after annealing. This suggests an associated enhancement of the spin-relaxation rate of conduction electrons due to an increase of carrier scatterings in the metallic system, consistent with Elliot's spin relaxation mechanism.
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