Enhancement of the Magnetoelectric Effect Using the Dynamic Jahn-Teller Effect in a Transition-Metal Complex
Enhancement of the Magnetoelectric Effect Using the Dynamic Jahn-Teller Effect in a Transition-Metal Complex
复制标题
利用过渡金属配合物中的动态 Jahn-Teller 效应增强磁电效应
DOI：
10.1103/physrevlett.128.117601
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发表时间：
2022
影响因子：
8.6
通讯作者：
Nakano Motohiro
中科院分区：
文献类型：
--
作者：
Otsuki Yasunao;Kimura Shojiro;Awaji Satoshi;Nakano Motohiro
在这篇论文中，展示了一种利用动态Jahn-Teller （JT）效应增强电极化和磁之间磁电耦合的新机制。在非中心对称的过渡金属配合物中，由于二阶ME效应，磁场会引起overs的电极化[(taa)]。与ME多铁性材料中的线性ME效应相比，这种电极化现象不需要磁有序。电极化值比由杂化引起的二阶ME效应引起的电极化值大1阶。我们的计算考虑了自旋轨道相互作用和铁畸变分子间相互作用产生的单离子型磁各向异性，证实了磁场对JT畸变的对准导致了观察到的大电极化。因此，我们的研究结果提供了一种利用磁场调节原子位移来获得强ME耦合的新方法。
In this Letter, a novel mechanism to enhance the magnetoelectric (ME) coupling between electric polarization and magnetism using the dynamic Jahn-Teller (JT) effect is demonstrated. Electric polarization of overis induced by the magnetic field owing to the second-order ME effect in the noncentrosymmetric transition metal complex [(taa)]. This appearance of electric polarization does not require magnetic order in contrast to the linear ME effect in ME multiferroic materials. The value of the electric polarization is 1 order larger than that induced by the second-order ME effect, which originates from thehybridization. Our calculation, taking into account the single-ion-type magnetic anisotropy originating from the spin-orbit interaction and ferrodistortive intermolecular interaction, verifies that the alignment of the JT distortion by the magnetic field results in the large electric polarization observed. Thus, our results provide a new method to gain strong ME coupling by tuning the atomic displacement using a magnetic field.