Level-crossing transition in the cluster compounds Nb6I11 and HNb6I11.

Finley J.J., Nohl H., Vogel E.E., Imoto H., Camley R.E., Zevin V., Andersen O.K., Simon A.

The cluster compounds Nb6I11 and HNb6I11 exhibit a coupled structural and electronic phase transition. The structural deformation is accompanied by a crossing of electronic levels which leads to a reduction of the spin degeneracy. The authors expect such level crossing transitions to occur in other compounds containing transition metal clusters.

Physical Review Letters, 46 1472-5, 1981.

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