Strong tuning of magnetism and electronic structure by spin orientation
Strong tuning of magnetism and electronic structure by spin orientation
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通过自旋取向强调整磁性和电子结构
DOI：
10.1103/physrevb.102.180401
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发表时间：
2020
影响因子：
3.7
通讯作者：
Dong Shuai
中科院分区：
文献类型：
--
作者：
Weng Yakui;Li Xing'ao;Dong Shuai
有效地操纵磁性是现代凝聚态物理的一个关键物理问题，也是磁性功能应用的关键。以往的相关研究大多依赖于自旋织构的调整，而自旋取向往往可以忽略不计。作为一个例外，$4d$/$5d$电子的自旋轨道耦合$J_{\rm}}$状态为涌现量子效应提供了一个理想的平台。然而，由于实际材料的复杂性，许多期望尚未实现。因此，对更理想的$J_{\rm}$状态的追求仍在继续。本文预测了六氯铌酸盐族中接近理想的$J_{\rm eff}$=$3/2$ Mott绝缘相，避免了钙钛矿氧化物的一些常见缺陷。局部磁矩在自旋分量和轨道分量之间几乎得到补偿，呈现出奇异的隐性磁性。更有趣的是，电子结构和磁性可以通过旋转自旋轴进行强调谐，这在自旋电子应用中很少见，但却是至关重要的。
To efficiently manipulate magnetism is a key physical issue for modern condensed matter physics, which is also crucial for magnetic functional applications. Most previous relevant studies rely on the tuning of spin texture, while the spin orientation is often negligible. As an exception, spin-orbit coupled $J_{\rm eff}$ states of $4d$/$5d$ electrons provide an ideal platform for emergent quantum effects. However, many expectations have not been realized due to the complexities of real materials. Thus the pursuit for more ideal $J_{\rm eff}$ states remains ongoing. Here a near-ideal $J_{\rm eff}$=$3/2$ Mott insulating phase is predicted in the family of hexachloro niobates, which avoid some common drawbacks of perovskite oxides. The local magnetic moment is nearly compensated between spin and orbital components, rendering exotic recessive magnetism. More interestingly, the electronic structure and magnetism can be strongly tuned by rotating spin axis, which is rare but crucial for spintronic applications.