Magnetic interactions in the tripod-kagome antiferromagnet Mg${}_2$Gd${}_3$Sb${}_3$O${}_{14}$ probed by static magnetometry and high-field ESR spectroscopy

Abstract

We report an experimental study of the static magnetization $M(H,T)$ and high-field electron spin resonance (ESR) of polycrystalline \MgGd, a representative member of the newly discovered class of the so-called tripod-kagome antiferromagnets where the isotropic Gd${}^{3+}$ spins ($S=7/2$) form a two-dimensional kagome spin-frustrated lattice. It follows from the analysis of the low-$T$ $M(H)$-curves that the Gd${}^{3+}$ spins are coupled by a small isotropic antiferromagnetic (AFM) exchange interaction $|J|\approx$ 0.3\,K. The $M(H,T)$-dependences measured down to 0.5\,K evidence a long-range AFM order at $T_{\text{N}}=1.7$\,K and its rapid suppression at higher fields $\ge 4$\,T. ESR spectra measured in fields up to 15\,T are analyzed considering possible effects of demagnetizing fields, single-ion anisotropy and spin-spin correlations. While the demagnetization effects due to a large sample magnetization in high fields and its shape anisotropy become relevant at low temperatures, the broadening of the ESR line commencing already at $T\lesssim 30$\,K may indicate the onset of the spin-spin correlations far above the ordering temperature due to the geometrical spin frustration in this compound.

arXiv comment14 pages, 13 figures, 5 formulas

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