High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu${}_2$IrO${}_3$

Abstract

By incorporating inert KCl into the Na${}_2$IrO${}_3$ + 2CuCl $\to$ Cu${}_2$IrO${}_3$ + 2NaCl topochemical reaction, we significantly reduced the synthesis temperature of Cu${}_2$IrO${}_3$ from the 350${}^{\circ }$C reported in previous studies to 170${}^{\circ }$C. This adjustment decreased the Cu/Ir antisite disorder concentration in Cu${}_2$IrO${}_3$ from $\sim$19$\%$ to $\sim$5$\%$. Furthermore, magnetic susceptibility measurements of the present Cu${}_2$IrO${}_3$ sample revealed a weak ferromagnetic-like anomaly with hysteresis at a magnetic transition temperature of $\sim$70 K. Our research indicates that the spin-disordered ground state reported in chemically disordered Cu${}_2$IrO${}_3$ is an extrinsic phenomenon, rather than an intrinsic one, underscoring the pivotal role of synthetic chemistry in understanding the application of Kitaev model to realistic materials.

arXiv comment7pages, 7 figures, 1 table, accepted in Journal of Physics: Condensed Matter

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Cited by in corpus (3)

• Unconventional and Powerful Ion Sources for Solid-State Ion Exchange, Cu2SO4 and Cu3PO4: Exemplified by Synthesis of Metastable β-CuGaO2 from Stable β-LiGaO2
• Novel electronic state of honeycomb iridate Cu${}_2$IrO${}_3$ at high pressure
• Evolution of crystal field and intraionic interactions in the ilmenite $A$IrO${}_3$ ($A$ = Mg, Zn, Cd) and hyperhoneycomb $\beta$-ZnIrO${}_3$