Superconductivity in a Molecular Metal Cluster Compound

Compelling evidence for band-type conductivity and even bulk superconductivity below $T\mathrm{\_}\text{c}\approx 8$ K has been found in ${}^{69,71}$Ga-NMR experiments in crystalline ordered, giant Ga$\mathrm{\_}84$ cluster-compounds. This material appears to represent the first realization of a theoretical model proposed by Friedel in 1992 for superconductivity in ordered arrays of weakly coupled, identical metal nanoparticles.