在Pb(100)上使闭壳层铅酞菁具有顺磁性
Making Closed-Shell Lead-Pthalocyanine Paramagnetic on Pb(100)
AI总结:
利用扫描隧道谱研究Pb(100)上的铅酞菁分子,发现特定取向和聚集状态下的PbPc$\uparrow$分子在超导能隙内出现YSR共振,证明其具有顺磁性,并分析了面外偶极矩的作用。
摘要:
利用扫描隧道谱研究了Pb(100)上的非平面分子铅酞菁(PbPc)。发现中心Pb离子指向(PbPc$\downarrow$)或远离(PbPc$\uparrow$)衬底的分子间存在分子轨道的刚性偏移,这可由分子与其镜像电荷间的相互作用来解释。在超导能隙内,观察到岛状结构中PbPc$\uparrow$分子的Yu-Shiba-Rusinov(YSR)共振,表明存在磁矩。这些束缚态既不存在于PbPc$\downarrow$分子,也不存在于孤立的PbPc$\uparrow$分子或沉积过程中失去Pb离子的分子(H$_0$Pc)上。YSR能量随分子邻居的取向和类型而变化。我们分析了PbPc面外偶极矩的作用。
英文摘要:
Lead phthalocyanine (PbPc), a non-planar molecule, is studied on Pb(100) using scanning tunneling spectroscopy. A rigid shift of the molecular orbitals is found between molecules with the central Pb ion pointing to (PbPc$\downarrow$) or away (PbPc$\uparrow$) from the substrate and understood from the interaction between the molecules and their image charges. Inside the superconducting energy gap, Yu-Shiba-Rusinov (YSR) resonances are observed for PbPc$\uparrow$ molecules in islands indicating the presence of a magnetic moment. Such bound states are neither present on PbPc$\downarrow$ molecules nor isolated PbPc$\uparrow$ or molecules that lost the Pb ion during deposition (H$_0$Pc). The YSR energies vary depending on the orientation and type of the molecular neighbors. We analyze the role of the out-of-plane dipole moment of PbPc.
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