Molecular Metal Complexes as Defined Spin Impurities for Kondo Physics

分子金属配合物作为近藤物理学定义的自旋杂质

• 批准号: 5445319
• 负责人: Professor Dr. Mario Ruben
• 金额: --
• 依托单位: Lehrstuhl für Angewandte Physik (LAP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5445319?language=en
• 关键词: Molecular; Metal; Complexes; Defined; Spin

The interaction of molecules with metals has recently attracted increasing attention due to the appearance of molecular electronics as a candidate for future nanoelectronics. In this project, we will create and investigate systems where a molecule carries an unpaired spin. We propose to investigate two types of interaction between the spin degree of freedom and the conduction electrons in the metal: The first experiment is dedicated to the dynamical screening of the spin degree of freedom by the conduction electrons of the metal, a phenomenon which is closely related to the Kondo effect known in solid state metals with magnetic impurities. For that purpose, we will immobilize spin-bearing coordination compounds (e.g. FeII and CoII compounds) in single-molecule junctions. Thereby, the main observable parameter will be the I/V dependence of a current passing through the spin-bearing molecule. Second, we will investigate binuclear compounds with two spin degrees of freedom. Here, more complicated variations of Kondo physics can be explored. As a further reaching goal (and presumably beyond the two-year period for this grant), this research will guide towards Spintronics on the single-molecule level, where the electron transport can be controlled by the relative orientation of the two spins. The requirements to the molecules and the experiment are delicate and imperatively need a close cooperation between synthetic chemistry and experimental physics.

由于分子电子学作为未来纳米电子学候选者的出现，分子与金属的相互作用最近引起了越来越多的关注。在这个项目中，我们将创建并研究分子携带不成对自旋的系统。我们建议研究金属中自旋自由度和传导电子之间的两种类型的相互作用：第一个实验致力于金属的传导电子对自旋自由度的动态屏蔽，这种现象与带有磁性杂质的固态金属中已知的近藤效应密切相关。为此，我们将在单分子连接中固定自旋配位化合物（例如 FeII 和 CoII 化合物）。因此，主要可观察参数将是通过自旋轴承分子的电流的 I/V 依赖性。其次，我们将研究具有两个自旋自由度的双核化合物。在这里，可以探索近藤物理学的更复杂的变化。作为进一步实现的目标（大概超出了该资助的两年期限），这项研究将指导单分子水平的自旋电子学，其中电子传输可以通过两个自旋的相对方向来控制。对分子和实验的要求很微妙，迫切需要合成化学和实验物理之间的密切合作。