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Magnetization, resistivity and specific heat measurements were performed onthe solution-grown, single crystals of six GdT$_2$Zn$_{20}$ (T = Fe, Ru, Os,Co, Rh and Ir) compounds, as well as their Y analogues. For the Gd compounds,the Fe column members manifest a ferromagnetic (FM) ground state (with anenhanced Curie temperature, $T_{\mathrm{C}}$, for T = Fe and Ru), whereas theCo column members manifest an antiferromagnetic (AFM) ground state.Thermodynamic measurements on the YT$_2$Zn$_{20}$ revealed that the enhanced$T_{\mathrm{C}}$ for GdFe$_2$Zn$_{20}$ and GdRu$_2$Zn$_{20}$ can be understoodwithin the framework of Heisenberg moments embedded in a nearly ferromagneticFermi liquid. Furthermore, electronic structure calculations indicate that thissignificant enhancement is due to large, close to the Stoner FM criterion,transition metal partial density of states at Fermi level, whereas the changeof FM to AFM ordering is associated with filling of electronic states with twoadditional electrons per formula unit. The degree of this sensitivity isaddressed by the studies of the pseudo-ternary compoundsGd(Fe$_x$Co$_{1-x}$)$_2$Zn$_{20}$ and Y(Fe$_x$Co$_{1-x}$)$_2$Zn$_{20}$ whichclearly reveal the effect of 3d band filling on their magnetic properties.

physical review. b, condensed matter and materials physics

Variation of the magnetic ordering in GdT$_2$Zn$_{20}$ (T= Fe, Ru, Os,  Co, Rh and Ir) and its correlation with the electronic structure of  isostructural YT$_2$Zn$_{20}$