title: Controlling the Kondo effect of an adsorbed magnetic ion through its chemical bonding.
abstract: 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.
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China.
authors.forename: Aidi
authors.initials: A
authors.lastname: Zhao
authors.forename: Qunxiang
authors.initials: Q
authors.lastname: Li
authors.forename: Lan
authors.initials: L
authors.lastname: Chen
authors.forename: Hongjun
authors.initials: H
authors.lastname: Xiang
authors.forename: Weihua
authors.initials: W
authors.lastname: Wang
authors.forename: Shuan
authors.initials: S
authors.lastname: Pan
authors.forename: Bing
authors.initials: B
authors.lastname: Wang
authors.forename: Xudong
authors.initials: X
authors.lastname: Xiao
authors.forename: Jinlong
authors.initials: J
authors.lastname: Yang
authors.forename: J G
authors.initials: JG
authors.lastname: Hou
authors.forename: Qingshi
authors.initials: Q
authors.lastname: Zhu