Manipulating Kondo Temperature via Single Molecule Switching

Details Manipulating Kondo Temperature via Single Molecule Switching Manipulating Kondo Temperature via Single Molecule Switching

2006-03-08

arxiv.org/abs/cond-mat/0603187v1

Physics

Condensed Matter

Materials Science

To appear in Nano Lett (2006)

Scientific paper

Two conformations of isolated single TBrPP-Co molecules on a Cu(111) surface are switched by applying +2.2 V voltage pulses from a scanning tunneling microscope tip at 4.6 K. The TBrPP-Co has a spin-active cobalt atom caged at its center and the interaction between the spin of this cobalt atom and free electrons from the Cu(111) substrate can cause a Kondo resonance. Tunneling spectroscopy data reveal that switching from the saddle to a planar molecular conformation enhances spin-electron coupling, which increases the associated Kondo temperature from 130 K to 170 K. This result demonstrates that the Kondo temperature can be manipulated just by changing molecular conformation without altering chemical composition of the molecule.

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