The intercalation of fluorine into graphite introduces defects into the highly crystalline pristine fibers. These defectsare studied using temperature-dependent resistivity and magnetoresistance measurements. A logarithmic increase in resistivity at low temperature is observed, whereas the high temperature behavior is metallic. At weak magnetic fields and low temperatures, a negative magnetoresistance is observed, which becomes positive at high fields. These effects are explainedusing the two theories of weak localization and hole-hole interaction. In the light of TEM pictures of the microstructure of the fluorinated fibers, the origin of the defects in the intercalated fibers is discussed.
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This work was supported by NSF under grant #8819896-DMR. We acknowledge many stimulating discussions with Dr. G. Dresselhaus. The high-field experiments have been carried out at the Francis Bitter National Magnet Laboratory (supported by the National Science Foundation).
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Di Vittorio, S.L., Dresselhaus, M.S., Bayot, V. et al. Weak Localization Effects in Fluorineintercalated Graphite Fibers. MRS Online Proceedings Library 209, 329–334 (1990). https://doi.org/10.1557/PROC-209-329