The crystal structure, and magnetic and resonant properties of decorated spin kagome system (CsCl)Cu5As2O10

Abstract

We report the synthesis and investigation of the crystal structure and physical properties of the averievite-like arsenate (CsCl)Cu₅As₂O₁₀. Just above room temperature, this compound undergoes a structural phase transition from the high temperature trigonal Pm1 (a = b = a₀ and c = c₀) to the low temperature monoclinic I2/a phase (, b = a₀, c ≈ 2c₀ and β ≈ 90.6°). According to thermodynamic and nuclear magnetic resonance measurements, it experiences a phase transition into a canted antiferromagnetic state at T_N = 21 K. The density functional theory calculations place the energy scale of the kagome exchange interaction parameter in (CsCl)Cu₅As₂O₁₀ in between those in V- and P-analogs.