Tuning molecule-mediated spin coupling in bottom-up-fabricated vanadium-tetracyanoethylene nanostructures.
Tuning molecule-mediated spin coupling in bottom-up-fabricated vanadium-tetracyanoethylene nanostructures.
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DOI：
10.1103/physrevlett.103.087205
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发表时间：
2009-07
影响因子：
8.6
通讯作者：
D. Wegner;R. Yamachika;Xiaowei Zhang;Yayu Wang;T. Baruah;M. Pederson;B. Bartlett;J. Long;M. Crommie
中科院分区：
文献类型：
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作者：
D. Wegner;R. Yamachika;Xiaowei Zhang;Yayu Wang;T. Baruah;M. Pederson;B. Bartlett;J. Long;M. Crommie
利用低温扫描隧道显微镜，通过原子操控的方法制备了钒原子与四氰基乙烯配体的杂化磁性配合物。使用隧道光谱，我们观察自旋极化的分子轨道以及近藤行为。对于具有两个V原子的络合物，近藤行为可以淬灭不同的分子排列，即使自旋极化轨道保持不变。这可以通过可变自旋-自旋（即，V-V）铁磁耦合通过一个单一的四氰基乙烯（TCNE）分子，支持密度泛函计算。
We have fabricated hybrid magnetic complexes from V atoms and tetracyanoethylene ligands via atomic manipulation with a cryogenic scanning tunneling microscope. Using tunneling spectroscopy we observe spin-polarized molecular orbitals as well as Kondo behavior. For complexes having two V atoms, the Kondo behavior can be quenched for different molecular arrangements, even as the spin-polarized orbitals remain unchanged. This is explained by variable spin-spin (i.e., V-V) ferromagnetic coupling through a single tetracyanoethylene (TCNE) molecule, as supported by density functional calculations.