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arXiv 0906.0732cond-mat.mes-hall
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自旋选择定则在单分子磁体磁化量子隧穿中的表现

Manifestation of Spin Selection Rules on the Quantum Tunneling of Magnetization in a Single Molecule Magnet

J. J. Henderson, C. Koo, P. L. Feng, E. del Barco, S. Hill, I. S. Tupitsyn, P. C. E. Stamp, D. N. Hendrickson

摘要:

我们提出了一种新的Mn 3单分子磁体(SMM)的低温磁强计测量,其中磁化的量子隧穿(QTM)显示了量子力学选择规则的明确证据。一个QTM共振只出现在高温下,证明了激发态之间的隧穿,自旋投影相差三倍:这是由分子的C3对称性决定的,它禁止从最低的亚稳态纯隧穿。共振禁止的分子对称性的解释,通过正确定向的Jahn-Teller轴的个别锰离子,并包括横向偶极场。这些因素可能对所有SMM中的QTM都很重要。

英文摘要:

We present low temperature magnetometry measurements on a new Mn3 single-molecule magnet (SMM) in which the quantum tunneling of magnetization (QTM) displays clear evidence for quantum mechanical selection rules. A QTM resonance appearing only at elevated temperatures demonstrates tunneling between excited states with spin projections differing by a multiple of three: this is dictated by the C3 symmetry of the molecule, which forbids pure tunneling from the lowest metastable state. Resonances forbidden by the molecular symmetry are explained by correctly orienting the Jahn-Teller axes of the individual manganese ions, and by including transverse dipolar fields. These factors are likely to be important for QTM in all SMMs.

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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