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arXiv · 2603.13865

Crystal structure, magnetic and resonant properties of decorated spin kagome system (CsCl)Cu$_5$As$_2$O$_{10}$

Ilya V. Kornyakov·Marina V. Likholetova·Irina E. Lezova·Sergey V. Krivovichev·Harald O. Jeschke·Yasir Iqbal·Alexey V. Tkachev·Sergey V. Zhurenko·Andrey A. Gippius·Larisa V. Shvanskaya·Alexander N. Vasiliev
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Abstract

We report the synthesis and investigation of the crystal structure and physical properties of the averievite-like arsenate, $(\mathrm{CsCl})\mathrm{Cu}_5\mathrm{As}_2\mathrm{O}_{10}$. Just above room temperature, this compound undergoes a structural phase transition from the high-temperature trigonal $P\bar{3}m1$ $(a=b=a_0$ and $c=c_0)$ to the low-temperature monoclinic $I2/a$ phase $(a \approx \sqrt{3}a_0$, $b=a_0$, $c \approx 2c_0$ and $\beta \approx 90.6^\circ)$. According to thermodynamic and nuclear magnetic resonance measurements, it experiences a phase transition into a canted antiferromagnetic state at $T_N = 21~\mathrm{K}$. The density functional theory calculations place the energy scale of kagome exchange interaction parameter in $(\mathrm{CsCl})\mathrm{Cu}_5\mathrm{As}_2\mathrm{O}_{10}$ in between those in V- and P-analogs.

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Ilya V. Kornyakov, Marina V. Likholetova, Irina E. Lezova, Sergey V. Krivovichev, Harald O. Jeschke, Yasir Iqbal, Alexey V. Tkachev, Sergey V. Zhurenko, Andrey A. Gippius, Larisa V. Shvanskaya, Alexander N. Vasiliev. 2026-03-14. Crystal structure, magnetic and resonant properties of decorated spin kagome system (CsCl)Cu$_5$As$_2$O$_{10}$. https://doi.org/10.1039/d5tc03217b

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