自下而上制备的钒-TCNE纳米结构中分子介导的自旋耦合的调节
Tuning Molecule-Mediated Spin Coupling in Bottom-Up Fabricated Vanadium-TCNE Nanostructures
摘要：
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（TCNE）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TCNE分子，支持密度泛函计算。
英文摘要：
We have fabricated hybrid magnetic complexes from V atoms and tetracyanoethylene (TCNE) 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 TCNE molecule, as supported by density functional calculations.
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