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Electronic conduction in GaM$_{4}$Se$_{8}$ (M=Nb;Ta) compounds with the fccGaMo$_{4}$S$_{8}$-type structure originates from hopping of localized unpairedelectrons (S=1/2) among widely separated tetrahedral M$_{4}$ metal clusters. Weshow that under pressure these systems transform from Mott insulators to ametallic and superconducting state with T$_{C}$=2.9 and 5.8K at 13 and 11.5GPafor GaNb$_{4}$Se$_{8}$ and GaTa$_{4}$Se$_{8}$, respectively. The occurrence ofsuperconductivity is shown to be connected with a pressure-induced decrease ofthe MSe$_{6}$ octahedral distortion and simultaneous softening of the phononassociated with MSe-bonds.Comment: 10 pages, 5 figure

physical review letters

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Transition from Mott Insulator to Superconductor inGaNb4Se8and