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We report the magnetic properties of a new class of materials: Ni9Te6n+ and Co6Te8n+ with n=0,1,2. These cluster compounds, which can be charged by chemical means from neutral to 2+, provide a unique and novel way to change the Fermi level. For most charge states we observe quenching of the spin and orbital moments at low temperatures, accompanied by a large value for the temperature independent susceptibility of the ground state. The generic presence of low-energy magnetic excitations in these compounds indicates that these systems exhibit strong electron correlations and form mesoscopic analogs of the mixed-valence–heavy-fermion compounds

Electron correlations on a mesoscopic scale: Magnetic properties of transition metal telluride cluster compounds