  In the recent publication, Phys. Rev. B 102, 144420 (2020), Cabrera-Baez et
al. present a study of the effects of Cd-substitution for Zn in the
ferromagnetic compound GdFe2Zn20. As part of this paper, they claim that for
GdFe2Zn18.6Cd1.4 the effective moment of Gd is reduced by 25% and the saturated
moment of Gd is reduced by over 40%. We regrew representative members of the
GdFe2Zn(20-x)Cdx series and did not find any such reductions. In addition, we
measured several crystals from the growth batch that was used by Cabrera-Baez
et al. and did not see such reductions. Although there is a modest increase in
TC with Cd substitution, there is no significant change in the Gd effective
moment or the saturated moment associated with the low temperature
ferromagnetic state.
