Manipulating Kondo temperature via single molecule switching.
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 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.
Iancu
Violeta
V
Nanoscale & Quantum Phenomena Institute, Physics & Astronomy Department, Ohio University, Athens, Ohio 45701, USA.
Deshpande
Aparna
A
Hla
Saw-Wai
SW
D003035:Cobalt / Q000737:chemistry*; D039301:Computers, Molecular; D004563:Electrochemistry / Q000379:methods*; D004574:Electromagnetic Fields; D008422:Materials Testing; D008968:Molecular Conformation / Q000528:radiation effects; D020409:Molecular Motor Proteins / Q000737:chemistry* / Q000528:radiation effects; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects; D011166:Porphyrins / Q000737:chemistry* / Q000528:radiation effects; D012815:Signal Processing, Computer-Assisted; D013696:Temperature
D020409:Molecular Motor Proteins; D011166:Porphyrins; D003035:Cobalt