Exploring of magnetic properties of magnetic molecules at interface

用扫描隧道显微镜和单分子光谱研究了酞菁铁的磁性（自旋态、磁各向异性、有序性）与金属表面的关系。成功地测量了单个分子的自旋激发谱和外磁场引起的塞曼分裂。根据分子-衬底界面处的耦合强度，自旋状态从S=1变为S=0。在氧化的Cu表面上，发生了吸附诱导的磁各向异性开关。在Au（111）上观察到了新的SU（4）Kondo效应，这为局域位的对称性在强关联多体现象如Kondo效应中起着重要作用提供了一个有趣的例子.首次实现了二维分子近藤晶格，其中单个分子的近藤效应与衬底电子介导的反铁磁自旋-自旋耦合竞争。

The relationship of magnetic properties(spin state, magnetic anisotropy, ordering) of iron phthalocyanine with metal surfaces was investigated by single molecule spectroscopy with a scanning tunneling microscope. The spin excitaion spectum and Zeeman splitting caused by external magnetic fields were successfully measured for individual molecules. Depending on the coupling strength at the molecule-substrate interface, the spin state is changed from S=1 to S=0. On oxidized Cu surface, the adsorption-induced switching of magnetic anisortropy takes place. The novel SU(4) Kondo effect is observed on Au(111), which provides an intriguing example that the symmetry of local site plays a vital role in the strongly-correlated many-body phenomena such as Kondo effect. Two-dimensional molecular Kondo lattice was realized for the first time where the Kondo effect at individual molecules competes with the antiferromagnetic spin-spin couplings mediated by the substrate electrons.