First Demonstration of Tuning Between the Kitaev and Ising Limits in a Honeycomb Lattice

Faranak Bahrami, Xiaodong Hu, Yonghua Du, Oleg I. Lebedev, Chennan Wang, Hubertus Luetkens, Gilberto Fabbris, Michael J. Graf, Daniel Haskel, Ying Ran & Fazel Tafti
Recent observations of novel spin-orbit coupled states have generated tremendous interest in $4d/5d$ transition metal systems. A prime example is the $J_{\text{eff}}=\frac{1}{2}$ state in iridate materials and \RCL\ that drives Kitaev interactions. Here, by tuning the competition between spin-orbit interaction ($\lambda_{\text{SOC}}$) and trigonal crystal field splitting ($\Delta_\text{T}$), we restructure the spin-orbital wave functions into a novel $\mu=\frac{1}{2}$ state that drives Ising interactions. This is done via a topochemical reaction that converts \LRO\ to \ALRO, leading...
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