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arXiv 2102.02740cond-mat.str-el
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4种$d$和5种$d$过渡金属化合物的自旋轨道纠缠电子相

Spin-orbit-entangled electronic phases in 4$d$ and 5$d$ transition-metal compounds

Tomohiro Takayama, Jiri Chaloupka, Andrew Smerald, Giniyat Khaliullin, Hidenori Takagi

摘要:

由于自旋轨道耦合和电子相互作用的相互作用,含有$4d$和$5d$过渡金属离子的复合氧化物最近成为关联电子物理中的一个新的范例。对于$4d$和$5d$离子,自旋-轨道耦合$ζ$可以大到0.2-0.4 eV,这与诸如Hund耦合$J_{\rm H}$、非立方晶场分裂$Δ$和电子跳跃幅度$t$的其它相关参数相当并且经常超过其它相关参数。这就产生了各种自旋-轨道纠缠自由度,关键是它们之间的非平凡相互作用取决于$d$ -电子构型、化学键和晶格几何形状。奇异的电子相经常出现,包括自旋轨道辅助的莫特绝缘体,量子自旋液体,激子磁性,多极有序和相关的拓扑半金属。本文选择性地综述了$4d$和$5d$过渡金属化合物中出现的一些最有趣的自旋轨道纠缠相。

英文摘要:

Complex oxides with $4d$ and $5d$ transition-metal ions recently emerged as a new paradigm in correlated electron physics, due to the interplay between spin-orbit coupling and electron interactions. For $4d$ and $5d$ ions, the spin-orbit coupling, $ζ$, can be as large as 0.2-0.4 eV, which is comparable with and often exceeds other relevant parameters such as Hund's coupling $J_{\rm H}$, noncubic crystal field splitting $Δ$, and the electron hopping amplitude $t$. This gives rise to a variety of spin-orbit-entangled degrees of freedom and, crucially, non-trivial interactions between them that depend on the $d$-electron configuration, the chemical bonding, and the lattice geometry. Exotic electronic phases often emerge, including spin-orbit assisted Mott insulators, quantum spin liquids, excitonic magnetism, multipolar orderings and correlated topological semimetals. This paper provides a selective overview of some of the most interesting spin-orbit-entangled phases that arise in $4d$ and $5d$ transition-metal compounds.

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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