Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel , Leibnizstrasse 19, 24098 Kiel, Germany.
Institut für Anorganische und Angewandte Chemie, Universität Hamburg , Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.
Nano Lett. 2017 Nov 8;17(11):7146-7151. doi: 10.1021/acs.nanolett.7b04181. Epub 2017 Oct 23.
Magnetic sandwich complexes are of particular interest for molecular spintronics. Using scanning tunneling microscopy, we evidence the successful deposition of 1,3,5-tris(η-borabenzene-η-cyclopentadienylcobalt) benzene, a molecule composed of three connected magnetic sandwich units, on Cu(111). Scanning tunneling spectra reveal two distinct spatial-dependent narrow resonances close to the Fermi level for the trimer molecules as well as for molecular fragments composed of one and two magnetic units. With the help of density functional theory, these resonances are interpreted as two Kondo resonances originating from two distinct nondegenerate d-like orbitals. These Kondo resonances are found to have defined spatial extents dictated by the hybridization of the involved orbitals with that of the ligands. These results opens promising perspectives for investigating complex Kondo systems composed of several "Kondo" orbitals.
磁性三明治配合物在分子自旋电子学中具有特殊的意义。通过扫描隧道显微镜，我们成功地在 Cu(111)上沉积了 1,3,5-三(η-硼苯-η-环戊二烯基钴)苯，这是一种由三个连接的磁性三明治单元组成的分子。扫描隧道谱显示，对于三聚体分子以及由一个和两个磁性单元组成的分子片段，在费米能级附近存在两个明显的空间相关窄共振。借助密度泛函理论，这些共振被解释为两个源于两个不同非简并 d 轨道的两个 Kondo 共振。发现这些 Kondo 共振具有由涉及轨道与配体轨道杂化决定的特定空间范围。这些结果为研究由几个“Kondo”轨道组成的复杂 Kondo 系统开辟了有希望的前景。
