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.
@article{arxiv.cond-mat/0603187,
title = {Manipulating Kondo Temperature via Single Molecule Switching},
author = {Violeta Iancu and Aparna Deshpande and Saw -Wai Hla},
journal= {arXiv preprint arXiv:cond-mat/0603187},
year = {2015}
}