Motional Narrowing of Electron Spin Resonance in Single-Walled Carbon Nanotubes

Details Motional Narrowing of Electron Spin Resonance in Single-Walled Carbon Nanotubes Motional Narrowing of Electron Spin Resonance in Single-Walled Carbon Nanotubes

2011-05-25

arxiv.org/abs/1105.5095v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

We have measured electron spin resonance in bulk single-walled carbon nanotubes. The linewidth was observed to narrow by as much as $\sim$50%, as the temperature was increased from 3 to 300 K. From the linewidth change versus temperature, we find the hopping frequency to be 285 GHz. Although the spins are mobile, they are still a finite-level-spin species, as indicated by the Curie law temperature dependence of the spin susceptibility. We show that the Dysonian lineshape asymmetry follows a three-dimensional variable-range hopping behavior from 3 to 20 K and extract a localization length of the hopping spins to be $\sim$100 nm.

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