Abstract
We have prepared sodium-doped C 60 utilizing the thermal decomposition of sodium azide (NaN 3). The strong low-magnetic field microwave absorption with a clear hysteresis was observed in the samples of Na nC 60 ( n=3∼4), indicating the superconducting nature. By means of a SQUID measurement, the superconducting transition temperature is found to be around 12 K. Significantly, elemental analysis detected a nitrogen which was surely produced in the process of the thermal decomposition of NaN 3. We suppose that this new superconducting phase will be Na xN yC 60 where x is between 3 and 4, and y is unknown. This is the first superconducting material in Na-doped C 60 without other alkali metals.
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