Controlling the Kondo effect of an adsorbed magnetic ion through its chemical bonding
Controlling the Kondo effect of an adsorbed magnetic ion through its chemical bonding
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DOI：
10.1126/science.1113449
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发表时间：
2005-09-02
期刊：
影响因子：
56.9
通讯作者：
Zhu, QS
中科院分区：
文献类型：
--
作者：
Zhao, AD;Li, QX;Zhu, QS
我们发现磁性离子的近藤效应依赖于它的化学环境。钴酞菁分子吸附在Au(111)表面，没有近藤效应。用扫描隧道显微镜尖端的电压脉冲从分子中去除8个氢原子，使分子的4个轨道与金衬底化学结合。在这种人工分子结构中恢复了定域自旋，并在费米面附近观察到明显的近藤共振。我们将高的近藤温度(超过200Kelvin)归因于小的现场库仑斥力和大的杂化d能级的半宽度。
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.