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ESR of Mn2+ in AlCl3-graphite intercalated compounds.

Electron-spin-resonance experiments of Mn + impurities in stage-2 A1C13-graphite intercalated compounds show the usual conduction-carrier spin resonance and a completely resolved Mn + spectrum of axial symmetry with the axial axis perpendicular to the carbon layers. The temperature dependence of the Mn second-order crystal-field parameter and spin-lattice relaxation time are reported. The hyperfine splittings were found to be temperature independent. The observed anomalies in the linewidth of the conduction-carrier spin resonance and the intensity of the Mn'+ resonance at T=200 K are interpreted in terms of a quasi-two-dimensional order-disorder phase transition experienced by the intercalant molecules at this temperature.