Manipulating Magnetism in a Single Molecule（文件+视频）
We report that the Kondo effect exerted by a magnetic ion depends on its
chemical environment. A cobalt phthalocyanine molecule adsorbed on an
Au(111) surface exhibited no Kondo effect. Cutting away eight hydrogen atoms
from the molecule with voltage pulses from a scanning tunneling microscope tip
allowed the four orbitals of this molecule to chemically bond to the gold
substrate. The localized spin was recovered in this artificial molecular structure,
and a clear Kondo resonance was observed near the Fermi surface. We attribute
the high Kondo temperature (more than 200 kelvin) to the small on-site
Coulomb repulsion and the large half-width of the hybridized d-level.
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