Journal
ACS NANO
Volume 11, Issue 3, Pages 2675-2681Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b07431
Keywords
Kondo effect; organometallic complex; self-assembly; scanning tunneling spectroscopy; X-ray absorption spectroscopy; X-ray magnetic circular dichroism; density functional theory
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Funding
- Swiss National Science Foundation [200020_140479, 200020_157081, PP00P2_133552]
- Swiss National Supercomputing Center (CSCS) [s675]
- Swiss National Science Foundation (SNF) [200020_157081, 200020_140479] Funding Source: Swiss National Science Foundation (SNF)
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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 3d(xz) and 3d(yz) 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.
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