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

我们的目的是开发多中心自旋团簇和一维自旋系统的静态和动态磁性能，这些系统在分子磁学中特别发现。这个项目的复杂性可能来自于磁交换相互作用的几何挫折，它与局部晶体场各向异性的相互作用，或者通过改变磁中心元素或其电荷状态来改变有效自旋简并的变化/交替。分子磁体所特有问题的多样性要求应用不同的实验技术来研究不同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）， Mössbauer光谱和宽带核磁共振到高频ESR，将与静态磁性的测量相结合。高达1太赫兹的高频和高达60特斯拉的极强磁场的独特组合将为磁超分子系统的研究开辟一条新的途径。高频ESR和高场强测量将能够探索电子能态的频谱，并探测这类材料中的一些基本的低能量激发。µSR， NMR和Mössbauer光谱将用于检测具有静态磁序的相和远程相互作用系统的低频激励。

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.