  Electronic states in metallic nanoclusters form energy shells and degree of
their filling depends on the number of delocalized electrons. In the region
close to half-filling the cluster geometry oscillates between the prolate and
oblate configurations (dynamic Jahn-Teller effect). For large clusters this
effect competes with pair correlation and, as a result, it is perfectly
realistic to observe the transition to the superconducting state. For some
clusters the value of the critical temperature is rather high, near 140K
