Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-06-02
Physics
Condensed Matter
Strongly Correlated Electrons
To be publish in Physica B
Scientific paper
10.1016/j.physb.2007.10.172
We present the results of the magnetic and specific heat measurements on V4 tetrahedral-cluster compound GaV4S8 between 2 to 300K. We find two transitions related to a structural change at 42K followed by ferromagnetic order at 12K on cooling. Remarkably similar properties were previously reported for the cluster compounds of Mo4. 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.
Nigam A. K.
Rastogi Ashok Kumar
Yadav C. S.
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