Abstract
We present the results of the magnetic and specific heat measurements on V 4 tetrahedral-cluster compound GaV 4S 8 between 2 and 300 K. We find two transitions related to a structural change at 42 K followed by ferromagnetic order at 12 K on cooling. Remarkably similar properties were previously reported for the cluster compounds of Mo 4. These compounds show an extremely high density of low energy excitations in their electronic properties. We explain this behavior in a cluster compound as due to the reduction of coulomb repulsion among electrons that occupy highly degenerate orbits of different clusters.
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