Electron spin relaxation of N@C60 in CS2

Details Electron spin relaxation of N@C60 in CS2 Electron spin relaxation of N@C60 in CS2

2005-10-24

arxiv.org/abs/cond-mat/0510610v2

J. Chem. Phys. 124, 014508 (2006)

Physics

Condensed Matter

Materials Science

6 pages, 6 figures V2: Updated to published version

Scientific paper

10.1063/1.2147262

We examine the temperature dependence of the relaxation times of the molecules N@C60 and N@C70 (which comprise atomic nitrogen trapped within a carbon cage) in liquid CS2 solution. The results are inconsistent with the fluctuating zero field splitting (ZFS) mechanism, which is commonly invoked to explain electron spin relaxation for S > 1/2 spins in liquid solution, and is the mechanism postulated in the literature for these systems. Instead, we find a clear Arrhenius temperature dependence for N@C60, indicating the spin relaxation is driven primarily by an Orbach process. For the asymmetric N@C70 molecule, which has a permanent non-zero ZFS, we resolve an additional relaxation mechanism caused by the rapid reorientation of its ZFS. We also report the longest coherence time (T2) ever observed for a molecular electron spin, being 0.25 ms at 170K.

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