Symmetry-Supported Magnetic Blocking at 20 K in Pentagonal Bipyramidal Dy(III) Single-Ion Magnets
Symmetry-Supported Magnetic Blocking at 20 K in Pentagonal Bipyramidal Dy(III) Single-Ion Magnets
复制标题
五角双锥 Dy(III) 单离子磁体中 20 K 时对称支持的磁阻挡
DOI：
10.1021/jacs.5b13584
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发表时间：
2016-03-02
影响因子：
15
通讯作者：
Tong, Ming-Liang
中科院分区：
文献类型：
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作者：
Chen, Yan-Cong;Liu, Jun-Liang;Tong, Ming-Liang
单分子磁体（SMMs）可以被捕获在由能量势垒分离的双磁性状态之一中，是高密度信息存储、量子处理和自旋电子学最有前途的候选者之一。迄今为止，已经取得了一系列相当大的成就。然而，在大多数SMM中，特别是在单离子磁体（西姆斯）中，磁化的快速量子隧穿（QTM）的存在提供了快速弛豫路线，并且通常为弛豫时间设置了限制。在这里，我们追求五角双锥对称性来抑制QTM，并提出五角双锥Dy（III）西姆斯[Dy（Cy 3 PO）（2）（H2O）（5）]Cl-3中心点（Cy 3 PO）中心点H2O中心点EtOH（1）和[Dy-（Cy 3 PO）（2）（H2O）（3）]Br-3中心点2（Cy 3 PO）中心点2 H（2）O中心点2 EtOH（2），（Cy 3 PO =三环己基氧化膦）。磁性表征揭示了其迷人的SMM性能与高能量势垒为472（7）K的1和543（2）K的2，沿着与记录的磁滞温度高达20 K的2。这些结果，结合从头计算，提供了一个启发性的洞察到巨大的可能性和潜力的对称性规则可以实现在分子磁性。
Single-molecule magnets (SMMs) that can be trapped in one of the bistable magnetic states separated by an energy barrier are among the most promising candidates for high-density information storage, quantum processing, and spintronics. To date, a considerable series of achievements have been made. However, the presence of fast quantum tunnelling of magnetization (QTM) in most SMMs, especially in single-ion magnets (SIMs), provides a rapid relaxation route and often sets up a limit for the relaxation time. Here, we pursue the pentagonal bipyramidal symmetry to suppress the QTM and present pentagonal bipyramidal Dy(III) SIMs [Dy(Cy3PO)(2)(H2O)(5)]Cl-3 center dot(Cy3PO)center dot H2O center dot EtOH (1) and [Dy-(Cy3PO)(2)(H2O)(3)]Br-3 center dot 2(Cy3PO)center dot 2H(2)O center dot 2EtOH (2), (Cy3PO = tricyclohexyl phosphine oxide). Magnetic characterizations reveal their fascinating SMM properties with high energy barriers as 472(7) K for 1 and 543(2) K for 2, along with a record magnetic hysteresis temperature up to 20 K for 2. These results, combined with the ab initio calculations, offer an illuminating insight into the vast possibility and potential of what the symmetry rules can achieve in molecular magnetism.