title: Two-Orbital Kondo Screening in a Self-Assembled Metal-Organic Complex.
abstract: Iron atoms adsorbed on a Cu(111) surface and buried under polyphenyl dicarbonitrile molecules exhibit strongly spatial anisotropic Kondo features with directionally dependent Kondo temperatures and line shapes, as evidenced by scanning tunneling spectroscopy. First-principles calculations find nearly full polarization for the half-filled Fe 3dxzand 3dyzorbitals, which therefore can give rise to Kondo screening with the experimentally observed directional dependence and distinct Kondo temperatures. X-ray absorption spectroscopy and X-ray magnetic circular dichroism measurements confirm that the spin in both channels is effectively Kondo-screened. At ideal Fe coverage, these two-orbital Kondo impurities are arranged in a self-assembled honeycomb superlattice.
authors.affiliation: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland.
authors.forename: Giulia E
authors.initials: GE
authors.lastname: Pacchioni
authors.affiliation: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland.
authors.forename: Marina
authors.identifier: 0000-0001-5330-8648
authors.initials: M
authors.lastname: Pivetta
authors.affiliation: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland.
authors.forename: Luca
authors.identifier: 0000-0003-1150-3941
authors.initials: L
authors.lastname: Gragnaniello
authors.affiliation: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland.
authors.forename: Fabio
authors.initials: F
authors.lastname: Donati
authors.affiliation: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Autès
authors.affiliation: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland.
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Yazyev
authors.affiliation: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland.
authors.forename: Stefano
authors.initials: S
authors.lastname: Rusponi
authors.affiliation: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland.
authors.forename: Harald
authors.identifier: 0000-0003-4459-3111
authors.initials: H
authors.lastname: Brune
keywords: Kondo effect; X-ray absorption spectroscopy; X-ray magnetic circular dichroism; density functional theory; organometallic complex; scanning tunneling spectroscopy; self-assembly