Abstract
Conduction electron spin resonance (CESR) of C 6Li intercalates from highly oriented pyrolytic graphite was investigated between 100 and 300 K with the external magnetic field parallel and perpendicular to the c-axis. The g-values were found to be essentially temperature independent and close to the free electron value: g ∥ = 2.0023, g ⊥ = 2.0031 ± 0.0002. A strong anistropy of the asymmetry ratios (A/B) ∥ and (A/B) ⊥ was observed. Both quantities decrease significantly upon cooling, in contrast to the C 8M (M = K, Rb, Cs) compounds. For the H o ∥ c orientation, the Bloembergen (slow-diffusion) limit of the Dysonian line shape is already reached in the vicinity of 250 K. We infer that the diffusion time along the c-axis is longer than 1 μs below this temperature. Compared to its C 8M counterparts, C 6Li appears much more two-dimensional at low temperatures, while room temperature ESR and d.c. transport anisotropies are known to behave in the opposite way.
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