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Local quantum phase transitions driven by Kondo correlations have beentheoretically proposed in several magnetic nanosystems; however, clearexperimental signatures are scant. Modeling a nickelocene molecule on a Cu(100)substrate as a two-orbital Anderson impurity with single-ion easy-planeanisotropy coupled to two conduction bands, we find that recent scanningtunneling spectra measured at different microscope tip heights reveal theexistence of a topological quantum phase transition from the usual local Fermiliquid with high zero-bias conductance to a non-Landau Fermi liquid,characterized by a non-trivial quantized Luttinger integral, with a smallconductance. The effects of intermediate valence, finite temperature, andstructural relaxation of the molecule position allow us to explain thedifferent observed behaviors.

Topological quantum phase transition of nickelocene on Cu(100)