Orbital Kondo effect in Cobalt-Benzene sandwich molecules

Details Orbital Kondo effect in Cobalt-Benzene sandwich molecules Orbital Kondo effect in Cobalt-Benzene sandwich molecules

2011-05-24

arxiv.org/abs/1105.4803v2

Phys. Rev. Lett. 107, 146604 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.107.146604

We study a Co-benzene sandwich molecule bridging the tips of a Cu nanocontact as a realistic model of correlated molecular transport. To this end we employ a recently developed method for calculating the correlated electronic structure and transport properties of nanoscopic conductors. When the molecule is slightly compressed by the tips of the nanocontact the dynamic correlations originating from the strongly interacting Co 3d shell give rise to an orbital Kondo effect while the usual spin Kondo effect is suppressed due to Hund's rule coupling. This non-trivial Kondo effect produces a sharp and temperature-dependent Abrikosov-Suhl resonance in the spectral function at the Fermi level and a corresponding Fano line shape in the low bias conductance.

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