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Science 2 September 2005:
Vol. 309. no. 5740, pp. 1542 - 1544
DOI: 10.1126/science.1113449
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Reports

Controlling the Kondo Effect of an Adsorbed Magnetic Ion Through Its Chemical Bonding

Aidi Zhao, Qunxiang Li, Lan Chen, Hongjun Xiang, Weihua Wang, Shuan Pan, Bing Wang, Xudong Xiao, Jinlong Yang,* J. G. Hou,* Qingshi Zhu

We report that the Kondo effect exerted by a magnetic ion depends on its chemical environment. A cobalt phthalocyanine molecule adsorbed on an Au(111) 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.

Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China.

* To whom correspondence should be addressed. E-mail: jghou{at}ustc.edu.cn (J.G.H.); jlyang{at}ustc.edu.cn (J.Y.)

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