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Different intercalated carbon systems: K_xC_{60}, Rb_xC_{60} as well as highly oriented pyrolytic graphite + potassium with unstable structural and superconducting behavior were investigated with the EPR and magnetically modulated microwave absorption techniques. Three characteristic, well-separated EPR signals were observed for A_xC_{60} (A = K or Rb) systems at the early stages of doping process...
EPR and ΜΜMΑ studies of C_{60} upon K-doping have been performed. Two different and well separated EPR narrow lines were detected for C^{1-}_{60} and C at temperatures below 100 K. Time dependent changes in the intensities of both and C^{3-}_{60} lines were observed when the system undergoes an eutectoid transformation. The evolution of superconductivity with two T_{c} related to different valences...
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