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We report an experimental study of the static magnetization $M(H,T)$ andhigh-field electron spin resonance (ESR) of polycrystalline \MgGd, arepresentative member of the newly discovered class of the so-calledtripod-kagome antiferromagnets where the isotropic Gd$^{3+}$ spins ($S = 7/2$)form a two-dimensional kagome spin-frustrated lattice. It follows from theanalysis of the low-$T$ $M(H)$-curves that the Gd$^{3+}$ spins are coupled by asmall isotropic antiferromagnetic (AFM) exchange interaction $|J| \approx$0.3\,K. The $M(H,T)$-dependences measured down to 0.5\,K evidence a long-rangeAFM order at $T_{\text{N}} = 1.7$\,K and its rapid suppression at higher fields$\geq 4$\,T. ESR spectra measured in fields up to 15\,T are analyzedconsidering possible effects of demagnetizing fields, single-ion anisotropy andspin-spin correlations. While the demagnetization effects due to a large samplemagnetization in high fields and its shape anisotropy become relevant at lowtemperatures, the broadening of the ESR line commencing already at $T\lesssim30$\,K may indicate the onset of the spin-spin correlations far above theordering temperature due to the geometrical spin frustration in this compound.

physical review. b./physical review. b

Magnetic interactions in the tripod-kagome antiferromagnet  Mg$_{2}$Gd$_{3}$Sb$_{3}$O$_{14}$ probed by static magnetometry and high-field  ESR spectroscopy