Synthesis and structural, magnetic, and resonance properties of the LiCuFe$_{2}$(VO$_{4}$)$_{3}$ compound

Complex studies have been performed for the structural, static magnetic, and resonance properties of a new magnet LiCuFe$_{2}$(VO$_{4}$)$_{3}$, prepared by solid-phase synthesis. The temperature dependence of the susceptibility has an anomaly at temperature $T_{\operatorname{max}}$ = 9.6 K. At high temperatures, the LiCuFe$_{2}$(VO$_{4}$)$_{3}$ sample is in the paramagnetic state described by the Curie–Weiss law at $T>$ 50 K and mainly determined by iron ions with effective magnetic moment $\mu_{\operatorname{eff(\exp)}}$ = 8.6$\mu_{\operatorname{B}}$ per formula unit. At low temperatures, a long-range magnetic order is observed in the magnetic subsystem of the sample; the order is predominantly characterized by the antiferromagnetic exchange interaction and high frustration level. The exchange interaction parameters are estimated in a six-sublattice representation of the LiCuFe$_{2}$(VO$_{4}$)$_{3}$ magnet. It is shown that the LiCuFe$_{2}$(VO$_{4}$)$_{3}$ compound is an antiferromagnet with strong intrachain and frustrating interchain exchange interactions.