Studies on Spin Ground States of Cubic-Symmetry Single-Molecule Magnets

立方对称单分子磁体自旋基态的研究

• 批准号: 23550076
• 负责人: NAKANO Motohiro
• 金额: $ 3.33万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23550076/
• 关键词: 単一分子磁石; スピンハミルトニアン; 磁気異方性; 高対称性分子; 常磁性多核錯体; トンネル分裂

Recently several cube-shaped single-molecule magnets (SMM) were reported, most of which have exact cubic symmetry (Oh). The magnetic anisotropy in conventional SMMs is uniaxial and incompatible with higher point symmetry like Oh. The highly degenerate spin ground states are studied based on the classical vector picture and the giant-spin approximation.Giant spin ground states in cube-shaped SMMs were subjected to Oh quartic anisotropy, and eight or six lowest levels, which correspond to a set of equivalent classical stable directions, are well-isolated by an energy gap growing as ~S4.Fine-splitting patterns of lowest levels showed longer-period modulations with increasing 2S+1, in addition to odd-even effect expected for Kramers/non-Kramers ground states. These splittings should correspond to tunnel splitting of semiclassical giant spins trapped in the anisotropy wells.

最近报道了几种立方体形状的单分子磁体（SMM），其中大多数具有精确的立方对称性（Oh）。传统 SMM 中的磁各向异性是单轴的，与 Oh 等更高的点对称性不相容。基于经典矢量图和巨自旋近似，研究了高度简并的自旋基态。立方体SMM中的巨自旋基态受到Oh四次各向异性的影响，以及八个或六个最低能级，对应于一组等效经典稳定方向，通过能隙增长为〜S4而被很好地隔离。最低能级的精细分裂模式显示出随着2S+1的增加而出现的更长周期调制，此外还有预期的奇偶效应克莱默/非克莱默基态。这些分裂应该对应于各向异性井中捕获的半经典巨自旋的隧道分裂。

项目成果

Phase Transition Behavior of a Manganese(III) Spin-Crossover Complex Examined through Dielectric and Magnetic Responses

通过介电和磁响应检查锰 (III) 自旋交叉络合物的相变行为

• DOI: 10.4019/bjscc.58.6
• 发表时间: 2011
• 期刊: Bulletin of Japan Society of Coordination Chemistry
• 作者: T. Ozawa;T. Wada;T. Inomata;Y. Funahashi;H. Masuda;中野 元裕
• 通讯作者: 中野 元裕

Magnetic and spectroscopic characterizations of high-spin cobalt(II) complex with soft-scorpionate ligand

• DOI: 10.1016/j.inoche.2012.01.003
• 发表时间: 2012-03-01
• 期刊: INORGANIC CHEMISTRY COMMUNICATIONS
• 影响因子: 3.8
• 作者: Baba, Haruyuki;Nakano, Motohiro
• 通讯作者: Nakano, Motohiro

Magnetic field-induced spin-crossover transition in [MnIII(taa)] studied by x-ray absorption spectroscopy

• DOI: 10.1063/1.3691608
• 发表时间: 2012-03
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: J. Her;Y. Matsuda;M. Nakano;Y. Niwa;Y. Inada

Crystal Packing Effects within [Mn^III _3O]^<7+> Single-Molecule Magnets : Controlling Intermolecular Antiferromagnetic Interactions

[Mn^III _3O]^<7 > 单分子磁体中的晶体堆积效应：控制分子间反铁磁相互作用

• DOI: 10.1016/j.poly.2011.05.030
• 发表时间: 2011
• 期刊: Polyhedron
• 影响因子: 2.6
• 作者: C.-I. Yang;K.-H. Cheng;S.-P. Hung;M. Nakano;and H.-L. Tsai
• 通讯作者: and H.-L. Tsai

High-Field Optical Spectroscopy of the Spin-Crossover Complex [MnIII(taa)]

• DOI: 10.1007/s10909-012-0750-0
• 发表时间: 2013-03-01
• 期刊: JOURNAL OF LOW TEMPERATURE PHYSICS
• 影响因子: 2
• 作者: Sawada, Y.;Kimura, S.;Nakano, M.
• 通讯作者: Nakano, M.