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Weak localization and coulomb interaction in graphite acceptor intercalation compounds

A logarithmic increase of resistance with decreasing temperature and a negative magnetoresistance have been observed on low stage acceptor graphite fiber intercalation compounds (GACs) at low temperature. These results may be explained within the framework of the recent theories of weak localization and electron-electron Coulomb interaction in two-dimensional (2D) disordered systems. It is shown that the amplitude of the effect and the temperature of the minimum resistance are directly related to the residual resistivity of the compound. The values of the temperature dependent inelastic scattering time obtained from the temperature and field dependence of the magnetoresistance are in quite good agreement with those predicted by both theories of electron-electron Coulomb interaction and electron-phonon interaction in 2D disordered systems. Because of the large variety of graphite host materials that may be intercalated, GACs are ideal for the study of weak localization and Coulomb interaction in 2D systems.