Electron correlations in transition metal-telluride cluster compounds

Thomas T.M. Palstra, ML STEIGERWALD, AP RAMIREZ, J ZAANEN

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Abstract

We report the magnetic properties of a new class of materials: Ni9Te6n+ 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 magnitude and universality of these results among different charge states can be explained neither by local moments in a finite size system nor by the molecular orbital approximation. The generic presence of low-energy magnetic excitations in these compounds indicates that these systems exhibit strong electron correlations and form mesoscopic analogues of the mixed valence/heavy fermion compounds.
Original languageEnglish
Pages (from-to)619-621
JournalPhysica B
Volume199-200
DOIs
Publication statusPublished - Apr 1994
Externally publishedYes

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