Abstract

The superconductivity in the first stage potassium graphite intercalation compound is discussed in connection with the electron transfer rate from potassium atom to graphite layers. From this discussion together with the experimental result that transition temperature T c depends little on the K atom concentration above a critical concentration, we conclude that the superconductivity takes place mainly on the graphite layer. The mechanism to increase three dimensional character with decreasing K atom concentration is also discussed.

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