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arXiv 1003.0537cond-mat.mes-hall
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S=4和S=12 Mn $_6$单分子磁体的非弹性中子散射和频域磁共振研究

Inelastic neutron scattering and frequency domain magnetic resonance studies of S=4 and S=12 Mn$_6$ single-molecule magnets

O. Pieper, T. Guidi, S. Carretta, J. van Slageren, F. El Hallak, B. Lake, P. Santini, G. Amoretti, H. Mutka, M. Koza, M. Russina, A. Schnegg, C. J. Milios, E. K… 展开作者

O. Pieper, T. Guidi, S. Carretta, J. van Slageren, F. El Hallak, B. Lake, P. Santini, G. Amoretti, H. Mutka, M. Koza, M. Russina, A. Schnegg, C. J. Milios, E. K. Brechin, A. Julia, J. Tejada

摘要:

利用中子非弹性散射和频域磁共振谱研究了三种Mn $_6$单分子磁体的磁性。实验数据表明,小的分子几何结构的扭曲产生显着的影响,能级图,因此对分子的磁性。我们发现巨自旋模型完全不能描述基态自旋多重态的自旋能级结构。我们从理论上分析了低自旋Mn $_6$分子(S=4)的自旋哈密顿量,并表明激发态$S$多重态在确定磁化反转的有效能垒方面起着关键作用,类似于以前对两个高自旋Mn 6(S=12)分子所发现的[S. Carretta等人,物理修订版信函100,157203(2008)]。

英文摘要:

We investigate the magnetic properties of three Mn$_6$ single molecule magnets by means of inelastic neutron scattering and frequency domain magnetic resonance spectroscopy. The experimental data reveal that small structural distortions of the molecular geometry produce a significant effect on the energy level diagram and therefore on the magnetic properties of the molecule. We show that the giant spin model completely fails to describe the spin level structure of the ground spin multiplets. We analyze theoretically the spin Hamiltonian for the low spin Mn$_6$ molecule (S=4) and we show that the excited $S$ multiplets play a key role in determining the effective energy barrier for the magnetization reversal, in analogy to what was previously found for the two high spin Mn6 (S=12) molecules [S. Carretta et al., Phys. Rev. Lett. 100, 157203 (2008)].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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