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