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We report neutron diffraction studies of TbCo$_2$Zn$_{20}$ andTbFe$_2$Zn$_{20}$, two isostructural compounds which exhibit dramaticallydifferent magnetic behavior. In the case of TbCo$_2$Zn$_{20}$, magnetic Braggpeaks corresponding to antiferromagnetic order are observed below $T_N$$\approx$ 2.5 K with a propagation vector of (0.5 0.5 0.5). On the other hand,TbFe$_2$Zn$_{20}$ undergoes a ferromagnetic transition at temperatures as highas 66 K which shows a high sensitivity to sample-to-sample variations. Twosamples of TbFe$_2$Zn$_{20}$ with the same nominal compositions but withsubstantially different magnetic ordering temperatures ($T_c$ $\approx$ 51 and66 K) were measured by single crystal neutron diffraction. Structuralrefinements of the neutron diffraction data find no direct signature of atomicsite disorder between the two TbFe$_2$Zn$_{20}$ samples except for subtledifferences in the anisotropic thermal parameters. The differences in theanisotropic thermal parameters between the two samples is likely due to verysmall amounts of disorder. This provides further evidence for the extremesensitivity of the magnetic properties of TbFe$_2$Zn$_{20}$ to small samplevariations, even small amounts of disorder.

Magnetic Order in TbCo2Zn20 and TbFe2Zn20