Discovery of a Dysprosium Metallocene Single-Molecule Magnet with Two High-Temperature Orbach Processes.
Discovery of a Dysprosium Metallocene Single-Molecule Magnet with Two High-Temperature Orbach Processes.
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DOI：
10.1021/acs.inorgchem.1c03980
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发表时间：
2022-04-25
影响因子：
4.6
通讯作者：
Layfield, Richard A.
中科院分区：
文献类型：
--
作者：
Guo, Fu-Sheng;He, Mian;Huang, Guo-Zhang;Giblin, Sean R.;Billington, David;Heinemann, Frank W.;Tong, Ming-Liang;Mansikkamaki, Akseli;Layfield, Richard A.
单分子磁体的磁双稳定性是新型纳米级信息存储材料的潜在基础。smm中磁化的热激活弛豫的标准模型是基于单个奥巴赫过程的发生。在这里，我们发现将磷原子加入到茂金属镝[(CpiPr5)Dy(CpPEt4)]+[B(C6F5)4]−（CpiPr5是五异丙基环戊二烯基，CpPEt4是四乙基膦基）的框架中会导致两个不同的高温Orbach过程的发生，其能垒分别为1410（10）和747(7)cm-1。这些势垒为两种不同的自旋声子耦合机制提供了实验证据，我们用从头算的方法解释了这一现象。该SMM中的强且高轴向晶体场也允许使用25 Oe s-1的扫描速率观察到高达70 K的磁滞。在描述这种SMM时，我们表明传统的Debye模型和考虑自旋声子相互作用的旋转贡献不足以解释所观察到的现象。当扫描速率为25 Oe s−1时，磷脂偶联茂金属镝单分子磁体表现出两个高温奥巴赫弛豫过程，有效能垒分别为1410（10）和747(7)cm−1，磁滞率高达70 K。
Magnetic bistability in single-molecule magnets (SMMs) is a potential basis for new types of nanoscale information storage material. The standard model for thermally activated relaxation of the magnetization in SMMs is based on the occurrence of a single Orbach process. Here, we show that incorporating a phosphorus atom into the framework of the dysprosium metallocene [(CpiPr5)Dy(CpPEt4)]+[B(C6F5)4]− (CpiPr5 is penta-isopropylcyclopentadienyl, CpPEt4 is tetraethylphospholyl) leads to the occurrence of two distinct high-temperature Orbach processes, with energy barriers of 1410(10) and 747(7) cm–1, respectively. These barriers provide experimental evidence for two different spin–phonon coupling regimes, which we explain with the aid of ab initio calculations. The strong and highly axial crystal field in this SMM also allows magnetic hysteresis to be observed up to 70 K, using a scan rate of 25 Oe s–1. In characterizing this SMM, we show that a conventional Debye model and consideration of rotational contributions to the spin–phonon interaction are insufficient to explain the observed phenomena. A phospholyl-ligated dysprosium metallocene single-molecule magnet shows two high-temperature Orbach relaxation processes with effective energy barriers of 1410(10) and 747(7) cm−1, and magnetic hysteresis up to 70 K when using a scan rate of 25 Oe s−1.
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影响因子：
16.6
作者：
Canaj, Angelos B.;Dey, Sourav;Murrie, Mark
通讯作者：
Murrie, Mark
影响因子：
21.8
作者：
Gaita-Arino, A.;Luis, F.;Coronado, E.
通讯作者：
Coronado, E.
影响因子：
64.8
作者：
Goodwin, Conrad A. P.;Ortu, Fabrizio;Mills, David P.
通讯作者：
Mills, David P.
DOI：
10.1007/bf01325397
发表时间：
1975-01-01
期刊：
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER
影响因子：
--
作者：
DOHM, V;FULDE, P
通讯作者：
FULDE, P
钬(III)单离子磁体中零场量子隧道的超精细交互驱动抑制
影响因子：
16.6
作者：
Chen, Yan-Cong;Liu, Jun-Liang;Tong, Ming-Liang
通讯作者：
Tong, Ming-Liang