Observation of Metallic Conductivity and Sharp Superconducting Transition at 19 K in Potassium-Doped Fulleride, C60, Single Crystal

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Abstract
The first observation of a “metallic” conductivity behavior by resistivity measurements is reported for a potassium-doped C60 single crystal. The superconducting transition takes place very sharply with about one degree temperature width, that is, the onset of Tc is 20 K and the resistivity becomes null at 19 K. The details of the doping process are described.