Bahrami Faranak, Hu Xiaodong, Du Yonghua, Lebedev Oleg I, Wang Chennan, Luetkens Hubertus, Fabbris Gilberto, Graf Michael J, Haskel Daniel, Ran Ying, Tafti Fazel
Department of Physics, Boston College, Chestnut Hill, MA 02467, USA.
National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973, USA.
Sci Adv. 2022 Mar 25;8(12):eabl5671. doi: 10.1126/sciadv.abl5671. Epub 2022 Mar 23.
Recent observations of novel spin-orbit coupled states have generated interest in 4/5 transition metal systems. A prime example is the [Formula: see text] state in iridate materials and α-RuCl that drives Kitaev interactions. Here, by tuning the competition between spin-orbit interaction (λ) and trigonal crystal field (Δ), we restructure the spin-orbital wave functions into a previously unobserved [Formula: see text] state that drives Ising interactions. This is done via a topochemical reaction that converts LiRhO to AgLiRhO. Using perturbation theory, we present an explicit expression for the [Formula: see text] state in the limit Δ ≫ λ realized in AgLiRhO, different from the conventional [Formula: see text] state in the limit λ ≫ Δ realized in LiRhO. The change of ground state is followed by a marked change of magnetism from a 6 K spin-glass in LiRhO to a 94 K antiferromagnet in AgLiRhO.
最近对新型自旋轨道耦合态的观察引发了人们对4/5过渡金属体系的兴趣。一个典型例子是铱酸盐材料和α-RuCl中驱动 Kitaev 相互作用的[公式：见正文]态。在此，通过调节自旋轨道相互作用（λ）和三角晶场（Δ）之间的竞争，我们将自旋轨道波函数重构为一种以前未观察到的驱动伊辛相互作用的[公式：见正文]态。这是通过一种将LiRhO转化为AgLiRhO的拓扑化学反应来实现的。利用微扰理论，我们给出了在AgLiRhO中实现的Δ≫λ极限下[公式：见正文]态的显式表达式，这与在LiRhO中实现的λ≫Δ极限下的传统[公式：见正文]态不同。基态的变化伴随着磁性的显著变化，从LiRhO中的6K自旋玻璃态变为AgLiRhO中的94K反铁磁体。
