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

Yuya Haraguchi; Daisuke Nishio-Hamane; Akira Matsuo; Koichi Kindo; Hiroko Aruga Katori

doi:10.1088/1361-648X/ad5d3a

paper

High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu $_{2}$ IrO $_{3}$

arXiv:2406.01925 · doi:10.1088/1361-648X/ad5d3a

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.

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

High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu $_{2}$ IrO $_{3}$

Abstract

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High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu2​IrO3​

Abstract

References in corpus (9)

Cited by in corpus (2)

High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu $_{2}$ IrO $_{3}$