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EAGER: Probing Single-Ion Magnets by Raman and Far-Infrared Spectroscopies

EAGER：通过拉曼光谱和远红外光谱探测单离子磁体

基本信息

批准号：
1633870
负责人：
Ziling Xue
金额：
$ 24万
依托单位：
University of Tennessee Knoxville
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-07-15 至 2020-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1633870&HistoricalAwards=false
关键词：
EAGER Probing Single Ion Magnets

项目摘要

In this project funded by the Chemical Structure, Dynamic & Mechanism B Program of the Chemistry Division, Professor Ziling (Ben) Xue in Department of Chemistry, University of Tennessee-Knoxville, is developing spectroscopic methods to characterize new classes of metal compounds with interesting magnetic properties. The goal is to understand the magnetic properties of these metal complexes in order to develop them into new materials for high-density data storage and quantum computing. The magnetic metal compounds could have a much larger storage capacity than the current data storage materials with significant energy savings and reduced environmental impacts. The project is interdisciplinary involving inorganic, physical, and materials chemistry. It is particularly suited to the education of researchers at different levels. The project will also offer students opportunities to conduct research at a national laboratory and broaden their educational training. Professor Xue's group is well-positioned to provide the high level of education and training for students underrepresented in science, including first-generation college students from low-income families.Single-ion magnets (SIMs) have been actively studied as they have demonstrated slow magnetic relaxation and quantum tunneling phenomenon. Anisotropy barriers to orientate molecular spins in discrete molecules of SIMs are large enough to display magnetic hysteresis. There have been active research efforts to design/prepare SIMs with large anisotropies and slow relaxations. Large separations between magnetic ground and excited states in SIMs are closely related to the large anisotropies and slow relaxation. It is a challenge to precisely determine the separations between magnetic ground and excited states, when the separations are more than 50 wavenumbers, and to spectroscopically probe magneto-phonon interactions leading to spin-lattice relaxation. This project investigates ways to directly determine magnetic separations more than 50 wavenumbers in SIMs and to probe magneto-phonon interactions. Raman and far-infrared spectroscopies inside magnetic fields are to be used to characterize SIMs, demonstrating that the spectroscopies could be developed into effective methods to probe molecular magnetism.

在这个由化学部化学结构、动力学与机理B项目资助的项目中，田纳西大学诺克斯维尔分校化学系的薛子岭教授正在开发光谱方法来表征具有有趣磁性的新型金属化合物。目标是了解这些金属配合物的磁性，以便将它们开发成用于高密度数据存储和量子计算的新材料。磁性金属化合物可以具有比当前数据存储材料大得多的存储容量，从而显着节省能源并减少对环境的影响。该项目是跨学科的，涉及无机、物理和材料化学。它特别适合不同层次研究人员的教育。该项目还将为学生提供在国家实验室进行研究并扩大他们的教育培训的机会。薛教授的团队有能力为科学领域中代表性不足的学生（包括来自低收入家庭的第一代大学生）提供高水平的教育和培训。单离子磁体（SIM）因其表现出慢磁弛豫和量子隧道现象而受到积极的研究。 SIM 离散分子中用于定向分子自旋的各向异性势垒足够大，足以显示磁滞现象。人们一直在积极研究设计/制备具有大各向异性和慢弛豫的 SIM。 SIM 中磁基态和激发态之间的大间隔与大的各向异性和缓慢的弛豫密切相关。当间隔超过 50 个波数时，精确确定磁性基态和激发态之间的间隔，以及通过光谱探测导致自旋晶格弛豫的磁声子相互作用是一项挑战。该项目研究了直接确定 SIM 中 50 多个波数的磁分离以及探测磁声子相互作用的方法。磁场内的拉曼光谱和远红外光谱将用于表征 SIM，证明光谱可以发展成为探测分子磁性的有效方法。

项目成果

期刊论文数量（16）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Effect of magnetic fields on the methyl rotation in a paramagnetic cobalt( ii ) complex. Quasielastic neutron scattering studies

磁场对顺磁性钴(ii)络合物中甲基旋转的影响。

DOI：
10.1039/c8cp01660g
发表时间：
2018
期刊：
Physical Chemistry Chemical Physics
影响因子：
3.3
作者：
Stavretis, Shelby E.;Mamontov, Eugene;Moseley, Duncan H.;Cheng, Yongqiang;Daemen, Luke L.;Ramirez-Cuesta, A. J.;Xue, Zi-Ling
通讯作者：
Xue, Zi-Ling

Probing Magnetic Excitations in Co II Single-Molecule Magnets by Inelastic Neutron Scattering: Probing Magnetic Excitations in Co II Single-Molecule Magnets by Inelastic Neutron Scattering

通过非弹性中子散射探测 Co II 单分子磁体中的磁激发：通过非弹性中子散射探测 Co II 单分子磁体中的磁激发

DOI：
10.1002/ejic.201801088
发表时间：
2019
期刊：
European Journal of Inorganic Chemistry
影响因子：
2.3
作者：
Stavretis, Shelby E.;Cheng, Yongqiang;Daemen, Luke L.;Brown, Craig M.;Moseley, Duncan H.;Bill, Eckhard;Atanasov, Mihail;Ramirez-Cuesta, Anibal J.;Neese, Frank;Xue, Zi-Ling
通讯作者：
Xue, Zi-Ling

Correction: Synthesis and structural characterization of metal complexes with macrocyclic tetracarbene ligands

修正：大环四碳烯配体金属配合物的合成与结构表征