通过单分子化学调控单个离子磁性*——单分子“手术”开启分子磁性“开关”

报道了如何通过改变单个磁性离子的化学环境来调控其自旋性质.利用扫描隧道显微镜，对吸附于Au(111)表面的单个钴酞菁分子进行化学修饰，通过在针尖上施加一定的电压脉冲，将分子配合体外层的8个氢原子“剪裁”掉，使其与金衬底形成稳定的化学键合.在这个新的人造分子结构中，其中心钴离子的电子态在费米面上出现强烈的共振峰；通过理论的模拟和分析，发现出现这一共振峰的原因是，脱氢和与衬底的化学结合使中心钴离子自旋性质发生改变，从而导致了输运特性中近藤效应（Kondo effect）的出现.

Manipulating the magnetism of an adsorbed magnetic ion through its chemical bonding

We have demonstrated 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 lobes of this molecule to chemically bond to the gold substrate. We found that the localized spin was recovered in this artificial molecular structure, and a clear Kondo resonance was observed near the Fermi surface.