Zhao Aidi, Hu Zhenpeng, Wang Bing, Xiao Xudong, Yang Jinlong, Hou J G
Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
J Chem Phys. 2008 Jun 21;128(23):234705. doi: 10.1063/1.2940338.
The Kondo effect in single dehydrogenated cobalt phthalocyanine (CoPc) molecules adsorbed on Au(111) monoatomic steps was studied with a low temperature scanning tunneling microscope. The CoPc molecules adsorbed on Au(111) monoatomic steps show two typical configurations, which can be dehydrogenated to reveal Kondo effect. Moreover, the Kondo temperatures (T(K)) measured for different molecules vary in a large range from approximately 150 to approximately 550 K, increasing monotonically with decreasing Co-Au distance. A simple model consisting of a single Co 3d(z) (2) orbital and a Au 6s orbital is considered and gives a qualitative explanation to the dependence. The large variation of T(K) is attributed to the variation of the interaction between the magnetic-active cobalt ion and the Au substrate resulted from different Co-Au distances.
利用低温扫描隧道显微镜研究了吸附在Au(111)单原子台阶上的单脱氢钴酞菁(CoPc)分子中的近藤效应。吸附在Au(111)单原子台阶上的CoPc分子呈现出两种典型构型，它们可以脱氢以揭示近藤效应。此外，对不同分子测量的近藤温度(T(K))在大约150 K到大约550 K的很大范围内变化，随Co-Au距离的减小而单调增加。考虑了一个由单个Co 3d(z)(2)轨道和一个Au 6s轨道组成的简单模型，并对这种依赖性给出了定性解释。T(K)的巨大变化归因于不同Co-Au距离导致的磁活性钴离子与Au衬底之间相互作用的变化。
