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