Zhao Aidi, Li Qunxiang, Chen Lan, Xiang Hongjun, Wang Weihua, Pan Shuan, Wang Bing, Xiao Xudong, Yang Jinlong, Hou J G, Zhu Qingshi
Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China.
Science. 2005 Sep 2;309(5740):1542-4. doi: 10.1126/science.1113449.
We report that the Kondo effect exerted by a magnetic ion depends on its chemical environment. A cobalt phthalocyanine molecule adsorbed on an Au111 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.
