Two-Orbital Kondo Screening in a Self-Assembled Metal-Organic Complex

Giulia E. Pacchioni, Marina Pivetta, Luca Gragnaniello, Fabio Donati, Gabriel Autès, Oleg V. Yazyev, Stefano Rusponi, Harald Brune

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

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 3dxz and 3dyz orbitals, 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.

Original languageEnglish
Pages (from-to)2675-2681
Number of pages7
JournalACS Nano
Volume11
Issue number3
DOIs
StatePublished - 28 Mar 2017

Keywords

  • Kondo effect
  • X-ray absorption spectroscopy
  • X-ray magnetic circular dichroism
  • density functional theory
  • organometallic complex
  • scanning tunneling spectroscopy
  • self-assembly

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