Manipulating Kondo temperature via single molecule switching
Manipulating Kondo temperature via single molecule switching
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DOI：
10.1021/nl0601886
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发表时间：
2006-04-01
期刊：
影响因子：
10.8
通讯作者：
Hla, SW
中科院分区：
文献类型：
--
作者：
Iancu, V;Deshpande, A;Hla, SW
在4.6K下，通过施加+2.2V的电压脉冲，使孤立的单个TBrPP-Co分子在铜(111)表面的两种构象发生转换。TBrPP-Co的中心有一个自旋活跃的钴原子，该钴原子的自旋与来自铜(111)衬底的自由电子之间的相互作用可以引起Kondo共振。隧道光谱数据表明，从鞍状分子构象到平面分子构象的转换增强了自旋-电子耦合，从而使相关的Kondo温度从130 K增加到170 K。这一结果表明，只需改变分子构象就可以控制Kondo温度，而不改变分子的化学组成。
Two conformations of isolated single TBrPP-Co molecules on a Cu(111) surface are switched by applying +2.2 V voltage pulses from a scanning tunneling microscope tip at 4.6 K. The TBrPP-Co has a spin-active cobalt atom caged at its center, and the interaction between the spin of this cobalt atom and free electrons from the Cu(111) substrate can cause a Kondo resonance. Tunneling spectroscopy data reveal that switching from the saddle to a planar molecular conformation enhances spin-electron coupling, which increases the associated Kondo temperature from 130 to 170 K. This result demonstrates that the Kondo temperature can be manipulated just by changing molecular conformation without altering chemical composition of the molecule.