Abstract
A new metastable superconductor with nominal composition of Li 2Na 1N y C 60 ( y unknown) is prepared by thermal decomposition of lithium azide (LiN 3) and sodium azide (NaN 3). It is suggested that the superconducting phase in this compound is created by intercalation of the neutral spacer such as NaN 3. The supeconductivity is examined by a low-field signal of microwave absorption (LFS) and by SQUID. The critical temperature is estimated to be 12 K from SQUID and 14 K from LFS measurement, and the shielding fraction is over 9% at 5 K. Superconducting parameters, such as critical temperature, upper and lower critical fields, coherence length and penetration depth are evaluated and found to be distinct from those in other fulleride superconductors.
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