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Publication
Synthetic Metals
Paper
Anisotropic metallic character of C6Li from CESR
Abstract
Conduction electron spin resonance (CESR) of C6Li 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 C8M (M = K, Rb, Cs) compounds. For the Ho∥ 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 C8M counterparts, C6Li 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. © 1983.