Studies of complex supramolecular spin clusters and spin chains in high magnetic fields

高磁场中复杂超分子自旋簇和自旋链的研究

• 批准号: 5430415
• 负责人: Dr. Vladislav Kataev
• 金额: --
• 依托单位: Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW) e.V.
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5430415?language=en
• 关键词: Studies; complex; supramolecular; spin; clusters

Our aim is to exploit the static and dynamic magnetic properties of multi center spin clusters and one-dimensional spin systems with additional degrees of freedom which are specifically found in molecular magnetism. The complexity addressed in this project may arise from geometric frustration of the magnetic exchange interaction, its interplay with local crystal field anisotropy or a variation/alternation of the effective spin degeneracy by changing the element of the magnetic center or its charge state. The diversity of the problems specific to molecular magnets requires the application of different experimental techniques to investigate the delicate relationship between various degrees of freedom. In this project different magnetic resonance techniques ranging from muon spin relaxation (µSR), Mössbauer spectroscopy and broad band NMR to high frequency ESR will be combined with the measurements of the static magnetic properties. The unique combination of high frequencies up to 1 THz and extremely strong magnetic fields up to 60 Tesla will open a new avenue in the studies of magnetic supramolecular systems. The high frequency ESR and high field magnetization measurements will enable to explore the spectrum of the electronic energy states and to probe a number of fundamental low-energy excitations in this class of materials. µSR, NMR and Mössbauer spectroscopy will be used to examine phases with static magnetic order and the low frequency excitations of long range interacting systems.

我们的目的是利用静态和动态磁性的多中心自旋团簇和一维自旋系统与额外的自由度，这是特别发现在分子磁学。在这个项目中解决的复杂性可能会出现从几何挫折的磁交换相互作用，其相互作用与本地晶体场各向异性或变化/交替的有效自旋简并通过改变元素的磁性中心或其电荷状态。分子磁体特有的问题的多样性需要应用不同的实验技术来研究各种自由度之间的微妙关系。在这个项目中，不同的磁共振技术，从μ子自旋弛豫（µSR），穆斯堡尔谱和宽带NMR到高频ESR，将与静态磁性能的测量相结合。高达1 THz的高频和高达60特斯拉的极强磁场的独特组合将为磁性超分子系统的研究开辟一条新的途径。高频ESR和高场磁化测量将能够探索电子能态的谱，并探测这类材料中的一些基本低能激发。µSR，NMR和穆斯堡尔谱将用于检查静态磁序的相位和长距离相互作用系统的低频激发。